APPROVAL INSPECTION TESTING CERTIFICATION TECHNICAL APPROVALS FOR CONSTRUCTION
Guaranteed Asphalt Ltd
Agrément Certificate
2 Mercury Way London SE14 5RR Tel: 020 7277 8773 Fax: 020 7639 5616
00/3701
Product Sheet 1
GUARAFLEX R WATERPROOFING SYSTEMS GUARAFLEX R ROOF WATERPROOFING SYSTEM PRODUCT SCOPE AND SUMMARY OF CERTIFICATE This Certificate relates to Guaraflex R Roof Waterproofing System, based on a polymer-modified mastic asphalt. The system is for use on flat roofs, including completely flat roofs, with limited access in either inverted roof specifications or protected specifications. AGRÉMENT CERTIFICATION INCLUDES: • factors relating to compliance with Building Regulations where applicable • factors relating to additional non-regulatory information where applicable • independently verified technical specification • assessment criteria and technical investigations • design considerations • installation guidance • regular surveillance of production • formal three-yearly review. KEY FACTORS ASSESSED Weathertightness — the system will resist the passage of moisture into the building (see section 5). Properties in relation to fire — the use of the system can enable a roof to be unrestricted under the current Building Regulations (see the Regulations section and section 6). Resistance to wind uplift — the system will resist the effects of any likely wind suction acting on the roof (see section 7). Resistance to mechanical damage — the system will accept the foot traffic and loads associated with the installation and maintenance operations and the effects of thermal or other minor movement likely to occur in practice without damage (see section 8). Durability — under normal service conditions the system will provide a durable waterproof surfacing with a service life in excess of that of conventional grades of mastic asphalt (see section 10). The BBA has awarded this Agrément Certificate to the company named above for the system described herein. This system has been assessed by the BBA as being fit for its intended use provided it is installed, used and maintained as set out in this Certificate. On behalf of the British Board of Agrément
Date of First issue: 12 January 2009 Originally certificated on 30 March 2000
Simon Wroe Head of Approvals — Materials
Greg Cooper Chief Executive
Certificate amended on 4 January 2010 to include revised description of Guarafelt CP and Guarafelt CP Super. The BBA is a UKAS accredited certification body — Number 113. The schedule of the current scope of accreditation for product certification is available in pdf format via the UKAS link on the BBA website at www.bbacerts.co.uk Readers are advised to check the validity and latest issue number of this Agrément Certificate by either referring to the BBA website or contacting the BBA direct.
British Board of Agrément Bucknalls Lane Garston, Watford Herts WD25 9BA
©2009 Page 1 of 16
tel: 01923 665300 fax: 01923 665301 e-mail: mail@bba.star.co.uk website: www.bbacerts.co.uk
Regulations In the opinion of the BBA, Guaraflex R Roof Waterproofing System if used in accordance with the provisions of this Certificate, will meet or contribute to meeting the relevant requirements of the following Building Regulations: The Building Regulations 2000 (as amended) (England and Wales)
Requirement:
B4(2)
Requirement:
C2(b)
Resistance to moisture
Tests for water resistance on the system indicate that it will enable a roof to satisfy this Requirement. See section 5 of this Certificate.
Comment: Requirement:
External fire spread
On flat roofs incorporating the system and with one of the supporting structures prescribed in part iv of Table A5 of Approved Document B, the roof shall be deemed to be of designation AA. See sections 6.2 and 6.3 of this Certificate.
Comment:
Regulation 7
Materials and workmanship
The system is acceptable. See sections 10.1 and 10.2 and the Installation part of this Certificate.
Comment:
The Building (Scotland) Regulations 2004 (as amended) Regulation:
8(1)(2)
Regulation: Standard:
9 2.8
3.10
Precipitation
Tests for water resistance on the system indicate that it will enable a roof to satisfy the requirements of this Standard, with reference to clauses 3.10.1(1)(2) and 3.10.7(1)(2). See section 5 of this Certificate.
Comment: Regulation:
Building standards — construction Spread from neighbouring buildings
Testing to BS 476-3 : 2004 will be required to determine the vulnerability of a roof including the product under clause 2.8.1(1)(2) of this Standard. See section 6.3 of this Certificate.
Comment: Standard:
Fitness and durability of materials and workmanship
The use of the system satisfies the requirements of this Regulation. See sections 9, 10.1 and 10.2 and the Installation part of this Certificate.
Comment:
12
Building standards — conversions
All comments given for the system under Regulation 9, also apply to this Regulation, with reference to clause 0.12.1(1)(2) and Schedule 6(1)(2).
Comment:
(1) Technical Handbook (Domestic). (2) Technical Handbook (Non-Domestic).
The Building Regulations (Northern Ireland) 2000 (as amended) Regulation:
B2
Regulation:
B3(2) C4(a)
Comment:
Resistance to ground moisture and weather
Tests for water resistance on the system indicate that it will enable a roof to satisfy the requirements of this Regulation. See section 5 of this Certificate.
Comment: Regulation:
Suitability of certain materials
The system is acceptable. See section 9 of this Certificate.
Comment: Regulation:
Fitness of materials and workmanship
The system is acceptable. See sections 10.1 and 10.2 and the Installation part of this Certificate.
Comment:
E5(b)
External fire spread
On flat roofs incorporating the system and with one of the supporting structures prescribed in part iii of Table 4.6 of Technical Booklet E, the roof shall be deemed to be of designation AA. See sections 6.2 and 6.3 of this Certificate.
Construction (Design and Management) Regulations 2007 Construction (Design and Management) Regulations (Northern Ireland) 2007 Information in this Certificate may assist the client, CDM co-ordinator, designer and contractors to address their obligations under these Regulations. See section:
2 Delivery and site handling (2.1, 2.2 and 2.3) and the Installation part of this Certificate.
Non-regulatory Information NHBC Standards 2008 NHBC accepts the use of Guaraflex R Roof Waterproofing System when installed and used in accordance with this Certificate, as meeting Technical Requirement R3 in relation to NHBC Standards, Chapter 7.1 Flat roofs and balconies.
Zurich Building Guarantee Technical Manual 2007 In the opinion of the BBA, Guaraflex R Roof Waterproofing System when installed and used in accordance with this Certificate, satisfies the requirements of the Zurich Building Guarantee Technical Manual, Section 4, Superstructure, Sub-section Flat roofs. Page 2 of 16
General Certificate relates to Guaraflex R Roof Waterproofing System. The system is based on Guaraflex PR, a polymermodified mastic asphalt waterproofing that is used in conjunction with a range of membranes and other components. The system is for use on flat roofs, including completely flat roofs, with limited access in either an inverted roof specification or a protected specification (eg covered by pavers or other suitable protection). Guaraflex PR is laid using the traditional techniques for mastic asphalt described in the relevant Clauses of BS 8218: 1998 and, where appropriate, BS 8217 : 2005 and the manufacturer’s instructions. Guaraflex PR is manufactured in the UK and marketed by the Certificate holder, and may be delivered to site in either hot charge or block form.
Technical Specification 1 Description 1.1 Guaraflex R is a roof waterproofing system based on a waterproofing grade polymer-modified mastic asphalt. 1.2 Products used in the Guaraflex R system include: • Guaraflex PR — polymer-modified waterproofing grade mastic asphalt manufactured by blending bitumen, graded aggregates, filler and polymer using conventional techniques • Guaraflash U — 4 mm thick, polymer-modified bitumen torch-on membrane used as flashing at abutments • Guaraflash T — 4 mm thick, polymer-modified bitumen torch-on membrane (mineral finished) used as flashing at abutments • Guaralath — 1 mm to 2 mm thick, expanded metal sheet to enable Guaraflex R to be applied at abutments • Guarafelt CP — 2 mm thick, polymer-modified glassfibre mat reinforced bitumen membrane • Guarafelt CP Super — 4 mm thick, polymer-modified glassfibre mat reinforced bitumen membrane. 1.3 Ancillary items outside of the scope of the assessment include: • Guarascreed — polymer-modified design mix asphalt screed(1) for use as a supporting layer under Guaraflex PR in warm roof specifications or as a protection layer over Guaraflex PR (1) Available in a terrazzo finish for internal application.
• Guaraflash T Root Barrier — 4 mm thick, polymer-modified torch-on membrane with mineral finish having rootresistant properties for use in roof garden applications • Flexible Fillet Strip — 15 mm thick by 45 mm wide torch-on flexible, preformed strip used as an alternative to an in-situ formed asphalt fillet • Procoat — a liquid-applied polyurethane spray or float-applied rubber compound used for forming skirting details. 1.4 Design specifications, descriptions and uses are detailed in Figure 1. 1.5 Quality control checks are performed on incoming raw materials, during production and on the finished material. Quality control 1.6 Guaraflex R waterproofing is manufactured by blending the appropriate bitumen, polymer, limestone filler and aggregates using conventional mixing techniques. 1.7 Quality control checks are performed on incoming raw materials, during production and on the finished components.
2 Delivery and site handling 2.1 Guaraflex PR is supplied in hot charge (molten) form, delivered to site in purpose-built transporters. The product information is supplied on the relevant delivery notes with each consignment. The manufacturer’s material safety data sheet should be consulted prior to discharging and handling the molten product. 2.2 Alternatively, the product may be supplied in block form (similar to traditional mastic asphalt) with labels bearing the product type and name. Each block weighs approximately 16 kg and should be stored in the same manner as traditional mastic asphalt. 2.3 The bitument primer is supplied in 5 litre and 25 litre drums. The product is classified under The Chemicals (Hazard Information and Packaging for Supply) Regulations 2002 (CHIP3) and bears the appropriate hazard warning label. The flashpoint and hazard classification are given in Table 1. 2.4 Guaraflash and Guarafelt membranes are supplied in rolls and should be stored on end on a clean, level surface away from heat and protected from inclement weather.
Table 1
Flashpoint and hazard classification of the bitumen primer
Flashpoint (°C) 36
Classification Flammable(1), Harmful
(1) The product should be stored in accordance with the Highly Flammable Liquids and Liquefied Petroleum Gases Regulations (1972).
Page 3 of 16
Figure 1
Design specifications
asphalt upstand
1
1 2
2
3 4
3
5
4 5 6
6
7
7
DS1(a)/DS2(a) inverted insulated roof/patio 1 2 3 4 5 6 7
DS3(a) warm roof concrete deck
traditional asphalt detail with Guaraflex PR precast paving slabs on pads/gravel ballast 50 mm to 75 mm thermal insulation geotextile membrane 15/20 mm Guaraflex PR Guarafelt CP or Guarafelt CP Super concrete substrate with Guarascreed or sand-cement screed to falls
1 2 3 4 5 6 7
traditional asphalt detail with Guaraflex PR solar reflective paint or 10 mm reflective chippings in bitumen compound 15/20 mm Guaraflex PR on Guarafelt CP Super insulation board single-layer Guaraflex PR or Guarafelt CP vapour control layer concrete substrate with Guarascreed or sand-cement screed to falls concrete deck
1
1
9 2 2 3
3
4
4 5
5 6
6 7 8
7 8
DS5(a) insulated roof gardens and planters
DS4(a) warm roof-timber deck 1 2 3 4 5 6 7 8 9
cover flashing traditional asphalt detail with Guaraflex PR solar reflective paint, or 10 mm reflective chippings in bitumen compound 15/20 mm Guaraflex PR on Guarafelt CP Super insulation board single-layer Guaraflex PR or Guarafelt CP vapour control layer plywood deck or softwood boarding expanded metal lathing on Guarafelt sheathing free-standing timber kerb
1 2 3 4 5 6 7
9 10
cement mortar pointing soil and vegetation filter layer with filter membrane paving slab insulation board non-woven polyester fleece isolating layer two--coat Guaraflex PR, 25 mm horizontally and three-coat 20 mm vertically, continued 150 mm above landscaped level 8 Guarafelt CP Super 9 concrete roof deck/Guarascreed or sand-cement screed 10 Guaraflash T protection
Page 4 of 16
Figure 1
Design specifications (continued)
flexible upstand
1
1
2
2 3
3 9
4
9
4
5 6
5 6 8
DS6 warm roof — metal deck
1 2 3 4
cover flashing Guaraflash U and T upstands solar reflective paint or chippings 20 mm Guaraflex PR on Guarafelt CP Super 5 plywood joints taped with Guarafelt CP
7
8
7
DS6 warm roof — metal deck insulated upstand
6 insulation board with plywood face and foil vapour barrier fixed to deck 7 metal deck 8 metal angle 9 flexible fillet strip
1 2 3 4
cover flashing Guaraflash U and T insulated upstand solar reflective paint or chippings 20 mm Guaraflex PR on Guarafelt CP Super 5 plywood joints taped with Guarafelt CP
6 insulation board with plywood face and foil vapour control layer fixed to deck 7 metal deck 8 metal angle 9 flexible fillet strip
1 2 3 4 5 1 2
7 8 9
12
6
6
3
13
7 10 11 12 13
14
8
15
9
4
16
10 5
11
14
15
16 DS7 cold roof timber deck edge detail
DS7 cold roof — timber deck
1 concrete coping stone or similar capping 2 damp-proof course 3 brick cavity wall 4 air brick or similar ventilation 5 air flow ventilation space 6 metal cover flashing 7 25 mm by 25 mm chase with mastic sealant pointing 8 Guaraflash U and T upstand
9 10 11 12 13 14 15 16
flexible fillet strip 15/20 mm Guaraflex PR Guarafelt CP Super timber firrings, minimum fall 1:80 timber board-type decking or similar softwood roof joists insulation foil-backed plasterboard ceiling
1 15/20 mm Guaraflex PR 2 softwood or plywood decking to cross battens at 450 mm centres 3 Guarafelt CP Super 4 EML 5 softwood batten 50 mm by 75 mm screwed through fascia 6 Guaraflex PR apron 15 mm with splayed edge 7 temporary splay batten to form asphalt feathered edge to apron 8 150 mm deep-flow PVC guttering fixed level to provide shallow falls with gutter brackets; brick or block cavity walls
Page 5 of 16
9 25 mm air flow gap between brickwork and fascia 10 25 mm timber fascia board fixed to 25 mm by 75 mm hardwood 11 insect mesh fixed to fascia 12 softwood cross battens 38 mm by 38 mm 13 softwood firrings fixed to timber roofing joists 14 softwood roofing joists 15 insulation laid between joists with minimum 75 mm air flow from top of firrings 16 foil-backed plasterboard ceiling
Figure 1
Design specifications (continued)
7 6 5 4
4
3 2
3 2
1
1
DS9 cold roof — concrete deck Guarascreed protection to waterproofing
DS8 warm roof — concrete deck Guarascreed (PMDMAS) over insulation 1 2 3 4 5 6 7
substrate (concrete/precast grouted planks) Guarafelt CP vapour control layer insulation board Guarafelt CP Super separating layer minimum 10 mm Guarascreed, laid to falls 15/20 mm Guaraflex PR waterproofing solar reflective paint or chippings
1 2 3 4
substrate (concrete/precast grouted planks) Guarafelt CP separating layer 10 mm Guaraflex PR waterproofing minimum 10 mm Guarascreed, laid to falls
9 8
7
5
7
4
6
6
3 2
5 4 3 2
1
1
DS10 warm roof — concrete deck fully protected system for podiums and pedestrian areas 1 2 3 4 5 6 7 8 9
DS11 fully-bonded triple protection inverted roof system for podiums, pedestrian areas and balconies
concrete deck Guarafelt CP isolating membrane 10 mm minimum Guaraflex PR waterproofing 10 minimum Guarascreed, laid to falls geotextile membrane loose-laid with 100 mm laps covered with 25 mm extruded polystyrene flexible fillet strip Guaraflash T surface finish, eg paving slabs with margin infill at abutments Guaraflash U
Page 6 of 16
1 2 3 4 5 6 7
concrete deck, flat or laid to falls Guarafelt CP (bonding layer) 15 mm Guaraflex PR waterproofing filter membrane insulation board permeable membrane surface finish, eg paving slabs
Figure 1
Design specifications (continued)
flexible upstand
1
1
5
2
2
3 8 4 6
3 8 5 6
4
7
7 DS2 super inverted insulated roof/patio
DS1 standard inverted insulated roof/patio
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
Guaraflash U and T upstand precast paving slabs on pads/gravel ballast 50 mm to 75 mm thermal insulation geotextile membrane 15/20 mm Guaraflex PR Guarafelt CP concrete substrate with Guarascreed or sand-cement screed to falls flexible fillet strip
Guaraflash U and T upstand precast paving slabs on pads/gravel ballast 50 mm to 75 mm thermal insulation geotextile membrane 20 mm Guaraflex PR Guarafelt CP Super concrete substrate flat or with Guarascreed or sand-cement screeds to falls flexible fillet strip
1
1 2 4
8
8 3
3
2
4 5 5
6
6
7
7 DS3 warm roof concrete deck
1 2 3 4 5 6 7 8
DS3(1) warm roof insulated upstand
Guaraflash U and T upstand solar reflective paint or 10 mm reflective chippings in bitumen compound 15/20 mm Guaraflex PR on Guarafelt CP Super insulation board single-layer Guaraflex PR or Guarafelt CP vapour control layer Guarascreed or sand-cement screed to falls concrete deck flexible fillet strip
1 2 3 4 5 6 7 8
Guaraflash U and T upstand solar reflective paint or 10 mm reflective chippings in bitumen compound 15/20 mm Guaraflex PR on Guarafelt CP Super insulation board single-layer Guaraflex PR or Guarafelt CP vapour control layer Guarascreed or sand-cement screed to falls concrete deck flexible fillet strip
flexible upstand details based on Procoat also available by agreement with Guaranteed Asphalt Ltd technical department
Page 7 of 16
Figure 1
Design specifications (continued)
1
1
2
2 4
8
7
3
3
6
4
5
6
9
5 8 9
7
DS4 warm roof timber deck 1 2 3 4 5 6 7 8 9
DS4(1) warm roof timber insulated upstand
cover flashing Guaraflash U and T upstand solar reflective paint, or 10 mm reflective chippings in bitumen 15/20 mm Guaraflex PR on Guarafelt CP Super insulation board Guarafelt CP Super plywood deck or softwood boarding flexible fillet strip Guarafelt CP vapour control layer
1 2 3 4 5 6 7 8 9
cover flashing Guaraflash U and T upstand solar reflective paint, or 10 mm reflective chippings in bitumen 15/20 mm Guaraflex PR Super insulation board Guarafelt CP Super flexible fillet strip Guarafelt CP Super vapour control layer plywood deck or softwood boarding
1
2
3 4 5 6 7 8 9 10 DS5 insulated roof gardens and planters 1 2 3 4 5 6 7
Guaraflash U and T upstand soil and vegetation filter layer with filter membrane paving slab insulation board non-woven polyester fleece isolating layer two-coat Guaraflex PR, 25 mm horizontally and three-coat 20 mm vertically, continued 150 mm above landscaped level 8 Guarafelt CP Super 9 concrete substrate/Guarascreed or sand-cement screed to falls 10 flexible fillet strip
flexible upstand details based on Procoat also available by agreement with Guaranteed Asphalt Ltd technical department
Page 8 of 16
Assessment and Technical Investigations The following is a summary of the technical investigations carried out on the Guaraflex R Roof Waterproofing System.
Design Considerations 3 General 3.1 • a • a • a
Guaraflex R Roof Waterproofing System is satisfactory for use on flat, limited or pedestrian access roofs as: waterproofing layer in inverted roof specifications waterproofing layer protected by pavers or other suitable protection waterproofing layer (tanking specification) on a flat roof with a zero fall slope.
3.2 Limited access roofs are defined for the purpose of this Certificate as those roofs subjected only to pedestrian traffic for maintenance of the roof covering and cleaning of gutters etc. Where traffic in excess of this is envisaged, special precautions such as additional protection (eg by tiling or paving) to the product should be considered. 3.3 Flat roofs are defined for the purpose of this Certificate as those roofs having a minimum finished fall of 1:80. Completely flat roofs are defined for the purpose of this Certificate as those roofs having a minimum finished fall of less than 1:80. 3.4 When designing flat roofs, twice the minimum finished fall should be assumed, unless a detailed analysis of the roof is available, including overall and local deflection, direction of falls, etc. 3.5 The product should be installed in accordance with the relevant clauses of BS 8218 : 1998 and, where appropriate, BS 8217 : 2005 and the Certificate holder’s instructions. 3.6 The structure must be designed to support all static and imposed loads without undue deflection. For the purpose of calculating design loads a weight per unit area of 2.4 kgm–2 per mm thickness of Guaraflex PR should be used. The Certificate holder should be consulted for the weights of specific specifications. 3.7 Decks to which the systems are to be applied must comply with the relevant requirements of BS 6229 : 2003, BS 8218 : 1998, the requirements of the Metal Roof Deck Association’s Code of Technical Requirements for Light Gauge Metal Roof Decks and, where appropriate, NHBC Standards 2008, Chapter 7.1, or the Zurich Building Guarantee Technical Manual 2007, pages 268 to 270. 3.8 Structural decks, to which green roofs, roof gardens and podiums are to be applied, must be of concrete and suitable to transmit the dead and imposed loads calculated in accordance with BS 6399- 1 : 1996 and BS 6399-3 : 1988 respectively. 3.9 Dead loads could also be dramatically increased if the drains become partially or completely blocked causing waterlogging of the drainage and soil layers. 3.10 Due to high application temperatures, insulation materials used in conjunction with the system must be approved by the Certificate holder. 3.11 Normal good practice in respect of vapour barriers and/or ventilation of existing insulation must be followed to control interstitial condensation.
4 Practicability of installation The product can be installed readily by apprentice-trained operatives experienced with this type of material.
5 Weathertightness Test data confirm that the system will accept minor structural movement and resist the passage of water and moisture to the inside of the building and so enable a structure to comply with the relevant requirements of the national Building Regulations.
6 Properties in relation to fire 6.1 In the opinion of the BBA, the system will have similar properties in relation to fire as the traditional grades of mastic asphalt described in BS 8218 : 1998. 6.2 When fully supported on structures described in the following references, exposed mastic asphalt has a ‘notional’ AA designation. 6.3 The designation of other specifications should be evaluated in accordance with the following guidance:
England and Wales — Approved Document B, Volumes 1 and 2, Paragraph 10.4 and 14.4 respectively Scotland — Mandatory Standard 2.8, Annex 2.D(1) and Annex 2.F(2) (1) Technical Handbook (Domestic). (2) Technical Handbook (Non-Domestic).
Northern Ireland — Technical Booklet E, Paragraph 4.19. Page 9 of 16
7 Resistance to wind uplift The system will resist the effects of wind suction likely to occur in practice.
8 Resistance to mechanical damage 8.1 Tests indicate that the system can accommodate, without damage, the thermal movement likely to occur in practice and the foot traffic and light concentrated loads associated with installation and maintenance operations. Where access exceeding this is envisaged, this should be taken into account when determining the application thickness and surface protection. 8.2 Reasonable care is required, however, to avoid prolonged loading by sharp objects, (see the Technical Investigations section Table for Performance tests). 8.3 Where the control of traffic is not possible, or in areas of public access, a surface protection of suitable tiles or paviours must be used.
9 Maintenance Roofs should be inspected annually, preferably in the autumn, to clear leaves, debris and dirt, to ensure efficient drainage and for any signs of damage.
10 Durability 10.1 Test data indicate that Guaraflex PR has improved high-temperature stability and increased extensibility at lower temperatures than those of conventional mastic asphalt. Accelerated ageing tests indicate a satisfactory retention of properties. On the basis of available data the Guaraflex R system should have a life expectancy in excess of that of conventional grades of mastic asphalt used in roofing applications. 10.2 When fully protected and subject to normal service conditions the system will provide an effective barrier to the transmission of liquid water and water vapour for the design life of the roof/substrate on which it is incorporated.
Installation 11 Procedure 11.1 Deck surfaces must be dry, clean, and free from sharp projections such as nail heads, concrete nibs. 11.2 Installation of Guaraflex R should be carried out using the traditional techniques for laying mastic asphalt described in the relevant Clauses of BS 8218 : 1998 and in accordance with the manufacturer’s instructions. The waterproofing layer can be applied in one or more layers. Typical specifications are shown in Figure 1. 11.3 Care must be taken not to exceed the maximum safe heating temperature of 240°C. 11.4 Where applicable, details are to be worked in accordance with traditional methods. Typical installation details are shown in Figure 2. 11.5 When incorporating a preformed flexible fillet strip in place of the angle fillet, upstand details must be made in accordance with the build-up procedure detailed in Figure 3. 11.6 On completion of the roof the final coat should be rubbed with coarse sharp sand using a wooden float. For solar protection, or for protection against foot traffic, Guaraflex R should have one of the following surface finishes: • mineral aggregates, of 10 mm nominal size (limestone, granite, calcined flint, calcite, felspar) bedded in a suitable compound • ballast of 20 mm to 40 mm graded aggregate, loose-laid on insulation, but secured around outlets, internal/ external angles and roof perimeters • light-coloured pedestrian tiles bedded in a suitable compound • concrete paving slabs on proprietary support pads • solar reflective paint approved by the Certificate holder and applied in accordance with the Certificate holder’s instructions. 11.7 Other applications, such as green roofs or roof gardens, may need a protective screed laid on the asphalt or an isolating membrane, depending on the circumstances. In these situations the advice of the Certificate holder should be sought.
12 Repair Should accidental damage occur, or alterations to the roof structure be required, then the recommendations of BS 8218 : 1998, Section 11 Maintenance and Repair, should be followed. The system should be reinstated to the original specification.
Page 10 of 16
Figure 2
Figure 3
Typical installation
Sequence of build-up — upstand details incorporating preformed flexible fillet
Rainwater outlet ⫺ insulated deck 1
2 3 4
6 1 approved rainwater outlet 2 waterproof asphalt or membrane dressed into outlet
3 specified roof finish 4 concrete surround
5 4 3 2
Rainwater outlet ⫺ uninsulated deck
1 1 stage 1
2 3 4
1 roof finish, selected specification 2 screed or similar to deck
3 flat roof rainwater outlet 4 solid slab 7
Handrail ⫺ standard 1 2 stage 2
3 4 5 6
1 watertight collar 2 two coats mastic asphalt to skirting or Guaraflash U and T 3 standard/support
9
4 specified roof finish 5 screed or similar deck 6 flexible fillet strip
8
Cradle track plinth
stage 3 1
2 3 4 5
7 flexible strip fillet (torch applied 1 sand/cement screed on first coat Guaraflex PR asphalt) laid to falls 2 Guarafelt CP vapour control layer 8 second coat Guaraflex PR asphalt fused to flexible strip fillet 3 insulation board (1) 9 Guaraflash T, turned 100 mm onto 4 Guarafelt CP Super horizontal asphalt and into chase 5 Guaraflex PR waterproofing at top on completion. 6 Guaraflash U turned 100 mm onto horizontal Guarafelt CP Super and into chase at top. (1) On non-insulated decks or externally insulated decks Guarafelt CP may be substituted for Guarafelt CP Super.
1 RSJ or similar track 2 lead washers under mild steel washers
3 mastic bedding 4 code 4 lead capping 5 specified roof finish
Page 11 of 16
Technical Investigations 13 Tests The BBA obtained samples of the Guaraflex PR asphaltic cement and Guaraflex PR for testing. The results of tests on the asphaltic cement and tests for the general physical properties and service performance on Guaraflex PR are given in Tables 2, 3 and 4 respectively.
Table 2
General characteristics — asphaltic cement
Test (units) Ash content (%)
Mean result
Method(1)
0.71
BS 2000-223
Ring and ball softening point (°C)
59
BS 2000-58
Needle penetration at 25°C (dmm)
38
BS 2000-49
(1) The test document is detailed in the Bibliography. Numbers in the table refer to sections/parts of the document.
Table 3
General physical properties — Guaraflex PR
Test (units)
Mean result
Density (kgm ) 10 mm Guaraflex PR
Method(1) direct measurement
–3
2137
Weight per unit area (kgm–2) 10 mm Guaraflex PR
direct measurement 22
Tensile strength (Nmm–2) 10 mm Guaraflex PR unaged 56 days heat aged at 70°C 180 days heat aged at 70°C
BS 2782-3.320E 0.62 0.97 1.33
Elongation (%) 10 mm Guaraflex PR unaged 56 days heat aged at 70°C 180 days heat aged at 70°C
BS 2782-3.320E 3.8 1.9 0.9
Water vapour permeability (gm–2 day)
BS 3177 (75% RH/25°C)
10 mm Guaraflex PR
0.067
(1) The test documents are detailed in the Bibliography. Numbers in the table refer to sections/parts of the various documents.
Table 4
Service performance
Test (units)
Mean result
Method(1)
Resistance to water pressure (6 m head on 10 mm Guaraflex PR)
no penetration
MOAT 27 : Method 5.1.4
Resistance to static indentation at 23°C Guaraflex PR on concrete substrate
MOAT 27 : Method 5.1.9 L4
Hardness at 23°C (dmm) Guaraflex PR unaged heat aged at 70°C for 56 days 180 days 5 cycles(2) 6 hours at 250°C 6 hours at 290°C Hard body impact at –10°C drop height (mm) at +20°C drop height (mm)
BS 5284 18 17 20 13 18 29 BBA method(3)
–1000 –1100
small indentation failure of sample
–1000 –1100
small indentation failure of sample
(1) The test documents are detailed in the Bibliography. Numbers in the table refer to sections/parts of the various documents. (2) 1 cycle = 6 hours heating at 240°C and 18 hours cooling at ambient temperature. (3) 1 kg steel ball on Guaraflex PR on concrete substrate.
Page 12 of 16
14 Investigations 14.1 Factory visits were performed to examine the manufacturing and quality control procedures at the production location. 14.2 A user survey was carried out to assess the product’s performance in service.
Additional Information The management systems of Guaranteed Asphalt Ltd have been assessed and registered as meeting the requirements of BS EN ISO 9002 : 1994 by the British Standards Institution Quality Assurance, Certificate Nos KM 07942 and KM 07350.
Bibliography BS 476-3 : 2004 Fire tests on building materials and structures — Classification and method of test for external fire exposure to roofs BS 2000-49 : 1993 Methods of test for petroleum and its products — Determination of needle penetration of bituminous material BS 2000-58 : 1993 Methods of test for petroleum and its products — Determination of softening point of bitumen — Ring and ball method BS 2000-223 : 1993 Methods of test for petroleum and its products — Determination of ash of petroleum products containing mineral matter BS 2782-3.320A to 320F : 1976 Methods of testing plastics — Mechanical properties — Tensile strength, elongation and elastic modulus BS 3177 : 1959 Method for determining the permeability to water vapour of flexible sheet materials used for packaging BS 5284 : 1976 Methods. Sampling and testing mastic asphalt and pitchmastic used in building BS 6229 : 2003 Flat roofs with continuously supported coverings — Code of practice BS 6399-1 : 1996 Loading for buildings — Code of practice for dead and imposed loads BS 6399-3 : 1988 Loading for buildings — Code of practice for imposed roof loads BS 8217 : 2005 Reinforced bitumen membranes for roofing — Code of practice BS 8218 : 1998 Code of practice for mastic asphalt roofing BS EN ISO 9002 : 1994 Quality systems. Model for quality assurance in production, installation and servicing MOAT No 27 : 1983 General Directive for the Assessment of Roof Waterproofing Systems
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Conditions of Certification 15 Conditions 15.1 This Certificate: • relates only to the product/system that is named and described on the front page • is granted only to the company, firm or person named on the front page — no other company, firm or person may hold or claim any entitlement to this Certificate • is valid only within the UK • has to be read, considered and used as a whole document — it may be misleading and will be incomplete to be selective • is copyright of the BBA • is subject to English law. 15.2 References in this Certificate to any Act of Parliament, Statutory Instrument, Directive or Regulation of the European Union, British, European or International Standard, Code of Practice, manufacturers’ instructions or similar publication, are references to such publication in the form in which it was current at the date of this Certificate. 15.3 This Certificate will remain valid for an unlimited period provided that the product/system and the manufacture and/or fabrication including all related and relevant processes thereof: • are maintained at or above the levels which have been assessed and found to be satisfactory by the BBA • continue to be checked as and when deemed appropriate by the BBA under arrangements that it will determine • are reviewed by the BBA as and when it considers appropriate. 15.4 In granting this Certificate, the BBA is not responsible for: • the presence or absence of any patent, intellectual property or similar rights subsisting in the product/system or any other product/system • the right of the Certificate holder to manufacture, supply, install, maintain or market the product/system • individual installations of the product/system, including the nature, design, methods and workmanship of or related to the installation • the actual works in which the product/system is installed, used and maintained, including the nature, design, methods and workmanship of such works. 15.5 Any information relating to the manufacture, supply, installation, use and maintenance of this product/system which is contained or referred to in this Certificate is the minimum required to be met when the product/system is manufactured, supplied, installed, used and maintained. It does not purport in any way to restate the requirements of the Health & Safety at Work etc Act 1974, or of any other statutory, common law or other duty which may exist at the date of this Certificate; nor is conformity with such information to be taken as satisfying the requirements of the 1974 Act or of any statutory, common law or other duty of care. In granting this Certificate, the BBA does not accept responsibility to any person or body for any loss or damage, including personal injury, arising as a direct or indirect result of the manufacture, supply, installation, use and maintenance of this product/system.
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British Board of AgrĂŠment Bucknalls Lane Garston, Watford Herts WD25 9BA
Š2009 Page 16 of 16
tel: 01923 665300 fax: 01923 665301 e-mail: mail@bba.star.co.uk website: www.bbacerts.co.uk