05 / 4210
reflective technology to create thermal efficiency
06/05
Why did regulation change? With the Government’s commitment to the Kyoto Agreement, there have been more stringent requirements to reduce Carbon Dioxide emissions in buildings. This has led to increased requirements in terms of thermal efficiency and airtightness. The new Part L and in Scotland Part J require more stringent elemental u-values With the constant lowering of u-value requirements in the Building Regulations and the pressure on the Government to reduce Carbon Dioxide emissions, the thermal requirements of building components have become very onerous.
The timber frame industry has always been able to meet comfortably the requirements laid down by the Government and has always proved a popular, energy efficient type of building. The recent changes in the u-value requirements have meant that a number of options are now available to the timber frame industry and have proved its flexibility of design. The development of these products has been specifically designed to help architects and specifiers meet the new thermal efficiency requirements.
Reflectashield TF is the only reflective breather membrane that complies with the vapour resistance requirements set out by BS 4016, TRADA and the NHBC. The existing legislation requires a breather membrane to have a vapour resistance not greater than 0.60 MNs/g. Reflectashield TF has a vapour resistance of 0.45 MNs/g. Advantages • • • • • •
Unique patented three layer composition. Low vapour resistance. Waterproof. High strength to weight ratio. Improved thermal resistance. Complies with BS 4016, TRADA & NHBC requirements. • 2.7 metre wide rolls. The A. Proctor Group can provide a whole range of solutions for a variety of u-values, down to as low as 0.18W/m2K for wall applications. The options available range from a reflective breathable membrane (Reflectashield TF) to a reflective vapour control layer (Reflectatherm Foil), and includes multi-layer reflective insulants (Tri-iso Super 9) and laminates (Plustherm).
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Reflectashield TF and Reflectatherm Foil
Key Point to Watch: Ensure all laps are sealed in Reflectatherm.
Construction a) 102.5mm Brick b) 50mm Cavity c) Reflectashield TF d) 9mm OSB e) 89mm Glasswool f)
Reflectatherm Foil
g) 19mm Cavity (stud) h) 12.5mm Plasterboard
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Acoustic Insulation • Geoengineering Solutions • Construction Membranes • Thermal Insulation • Vibration Isolation
Reflectashield TF Reflectashield TF is a result of in-depth research into meeting the timber frame requirements of reducing the u-values for walls, whilst minimising the risk of condensation. Reflectashield TF is a non-woven polypropylene film laminate, providing excellent emmissivity along with breathability and providing secondary protection to the building during construction.
reflectashieldTF
Reflectashield TF
The product is installed on the external face of the timber frame foil side face out, similar to that of a traditional breather membrane, with the added thermal benefits associated with a reflective insulant. The A. Proctor Group has, for many years, been a leader in the timber frame breather membrane market and this latest innovation will provide timber frame manufacturers with improved thermal efficiency of the wall with minimum, if any, increase in timber stud size and thus less intrusion into the internal room dimensions. 05 / 4210
U Value - Condensation Risk Analysis
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U Value - Construction Type Element: Timber frame wall Internal surface emissivity: External surface emissivity: Building Use:
1 2 3 4 5 6 7 8 9
(meeting English and Welsh regulation requirements)
Wall - Reflective Breather - Mineral Wool K Value 0.035 - 89mm studs High High House or Flat
Thickness Thermal Thermal Conductivity Resistance (mm) (W/mK) (m2K/W) Outside surface resistance 0.040 Brick, Dense, External 102.00 0.770 0.132 Reflectashield cavity - vented 50.00 0.469 0.469 Reflectashield TF 0.50 0.000 OSB 9.00 0.130 0.069 Mineral Wool - 15% Bridging 89.00 0.035 2.543 Procheck Premier 500 0.40 0.000 0.000 Plasterboard 12.50 0.210 0.060 Inside surface resistance 0.13
Vapour Restivity (MNs/gm) 80.00 900.00 104.00 10.00 1332500 60.00 -
Vapour Resistance MNs/g) 8.16 0.00 0.45 0.94 0.95 533.00 0.75 -
U-value, Combined Method : 0.35 W/m2K (See page 8 for further U-values with performance ready reckoner) Based on the combined method for determining U-values of structures containing repeated thermal bridges.
U Value - Construction Type Element: Timber frame wall Internal surface emissivity: External surface emissivity: Building Use:
1 2 3 4 5 6 7 8 9
(meeting Scottish regulation requirements)
Wall - Reflective Breather - Mineral Wool K Value 0.037 - 115mm studs
High High House or Flat Thickness Thermal Thermal Conductivity Resistance (mm) (W/mK) (m2K/W) Outside surface resistance 0.040 Brick, Dense, External 102.00 0.770 0.132 Reflectashield cavity - vented 50.00 0.469 0.469 Reflectashield TF 0.50 0.000 0.000 OSB 9.00 0.130 0.069 Mineral Wool - 15% Bridging 115.00 0.037 3.286 Procheck Premier 500 0.40 0.000 0.000 Plasterboard 12.50 0.210 0.060 Inside surface resistance 0.13
Vapour Restivity (MNs/gm) 80.00 900.00 104.00 10.00 1332500 60.00 -
Vapour Resistance (MNs/g) 8.16 0.00 0.45 0.94 1.15 533.00 0.75 -
U-value, Combined Method : 0.30 W/m2K Based on the combined method for determining U-values of structures containing repeated thermal bridges. For advice on meeting IRISH Regulations (U-value 0.27 W/m2K) and lower U-values Please contact The A. Proctor Group Techline.
Roll Specification Roll size: Colour:
2.7m x 100m Silver and White (Silver installed to the outside)
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Acoustic Insulation • Geoengineering Solutions • Construction Membranes • Thermal Insulation • Vibration Isolation
Reflectatherm Foil Reflectatherm Foil is a reflective vapour control layer. The membrane should be installed in the traditional manner, on the inside face of the insulant and should have a minimum of a 19mm airspace between the plasterboard and the vapour control layer. This airspace can be utilised as a service void which reduces the number of penetrations to the vapour control layer, thus enhancing the thermal efficiency and reducing the condensation risk.
reflectathermfoil
Reflectatherm Foil
The VCL is reinforced to increase its’ robustness and to reduce the risk of tearing on site. Again, all laps should be sealed and any penetrations sealed around to prevent moisture migration. This will also increase the airtightness of the building and should be taken into consideration during design. Advantages • High vapour resistance • Improved airtightness • Creates service void • Creates an unbroken vapour control layer • Improved thermal resistance • Meets the requirements of the new Part L in England and Wales, Part J in Scotland+
U Value - Condensation Risk Analysis
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10
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U Value - Construction Type Element: Timber frame wall Internal surface emissivity: External surface emissivity: Building Use:
(meeting English and Welsh regulation requirements)
Wall - Reflective VCL - Mineral Wool K value 0.040 - 89mm studs
High High House or Flat Thickness Thermal Thermal Vapour Conductivity Resistance Restivity (mm) (W/mK) (m2K/W) (MNs/gm) 1 Outside surface resistance 0.040 2 Brick, Dense, External 102.00 0.770 0.132 80.00 3 Cavity - vented 50.00 0.180 4 Frameshield 100 0.50 0.000 0.000 340.00 5 OSB 9.00 0.130 0.069 104.00 6 Mineral Wool - 15% Bridging 89.00 0.040 2.225 10.00 7 Reflectatherm Foil 0.20 0.000 0.000 12500000.0 8 Reflectatherm Cavity - timber straps 19.00 0.644 9 Plasterboard 12.50 0.210 0.060 60.00 10 Inside surface resistance 0.13 -
Vapour Resistance MNs/g) 8.16 0.00 0.17 0.94 0.89 2500.00 0.00 0.75 -
U-value, Combined Method : 0.34 W/m2K Based on the combined method for determining U-values of structures containing repeated thermal bridges.
U Value - Construction Type Element: Timber frame wall Internal surface emissivity: External surface emissivity: Building Use:
(meeting Scottish regulation requirements)
Wall - Reflective VCL - Mineral Wool K value 0.040 - 115mm studs High High House or Flat
Thickness Thermal Thermal Vapour Conductivity Resistance Restivity (mm) (W/mK) (m2K/W) (MNs/gm) 1 Outside surface resistance 0.040 2 Brick, Dense, External 102.00 0.770 0.132 80.00 3 Cavity - vented 50.00 0.180 4 Frameshield 100 0.50 0.000 0.000 340.00 5 OSB 9.00 0.130 0.069 104.00 6 Mineral Wool - 15% Bridging 115.00 0.040 2.875 10.00 7 Reflectatherm Foil 0.20 0.000 0.000 12500000.0 8 Reflectatherm Cavity - timber straps 19.00 0.644 9 Plasterboard 12.50 0.210 0.060 60.00 10 Inside surface resistance 0.13 -
Vapour Resistance MNs/g) 8.16 0.00 0.17 0.94 1.15 2500.00 0.00 0.75 -
U-value, Combined Method : 0.29 W/m2K (See page 8 for further U-values with performance ready reckoner) Based on the combined method for determining U-values of structures containing repeated thermal bridges. For advice on meeting IRISH Regulations (U-value 0.27 W/m2K) and lower U-values Please contact The A. Proctor Group Techline.
Roll Specification Roll size: Weight: Thickness:
1.35m x 50m (Other sizes available on request) 110g 0.17mm
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Acoustic Insulation • Geoengineering Solutions • Construction Membranes • Thermal Insulation • Vibration Isolation
Product Selector Waterproof Resistant
Reflective Breather
Reflectashield TF
Yes
Yes
Reflectatherm Foil
Yes
Reflective VCL
Yes
U Value - Performance Ready Reckoner Stud
89mm
Insulation K Value
0.040 0.037 0.035 0.032 0.023* 0.040 0.037 0.035 0.032 0.023* 0.040 0.037 0.035 0.032 0.023*
Reflectashield TF
95mm
115mm
0.37
0.36
0.35
0.33
0.29
0.36
0.34
0.33
0.32
0.27
0.31
0.30
0.29
0.28
0.24
0.34
0.33
0.32
0.31
0.26
0.33
0.31
0.31
0.29
0.25
0.29
0.28
0.27
0.26
0.22
Reflectashield TF & Reflectatherm Foil
0.31
0.30
0.29
0.28
0.24
0.30
0.29
0.28
0.27
0.23
0.27
0.26
0.25
0.24
0.21
Stud
140mm
Insulation K Value
0.040 0.037 0.035 0.032 0.023* 0.040 0.037 0.035 0.032 0.023*
Reflectatherm Foil
Reflectashield TF Reflectatherm Foil Reflectashield TF & Reflectatherm Foil
145mm
Does Not Comply
0.27
0.26
0.25
0.24
0.21
0.26
0.25
0.25
0.24
0.21
0.25
0.24
0.24
0.23
0.20
0.25
0.24
0.23
0.22
0.19
0.23
0.23
0.22
0.21
0.19
0.23
0.22
0.22
0.21
0.18
Complies Part L (England & Wales)- 0.35 Complies Part J (Scotland) - 0.30 Complies Part J (Scotland) Non SEDBUK Boiler and Part L (Ireland) – 0.27
* When utilising rigid insulation boards between studs, accommodation for services should be considered. The above calculations are based on fully filling the stud with insulation, therefore additional space for services should be designed, if appropriate, with either increased stud depth or service cavity
Construction
Construction Base used on above calcs – Substituting Reflectashield TF or Reflectatherm Foil as appropriate 102mm Brick
-
50mm Vented Cavity
-
Breather Membrane - Frameshield 100 or Reflectashield TF
Cavity R-Value 0.18
9mm OSB
-
Timber Stud - 15% Bridging
-
Vapour Control Layer - Procheck Premier or Reflectatherm Foil with 19 mm service void 12.5mm Plasterboard
-
Based as 15% Timber Thermal Bridge
Physical Properties Properties
Units
Basic Weight
g/m2
120
100
Roll Size
m
2.7m x 100m
1.35m x 50m
Thermal Resistance (R value)
W/m2K
0.469
0.644
Water Resistance Test (Mason Jar)
Pass/Fail
Pass
N/A
Vapour Resistance
MNs/g
0.45 to BS 3177*
2500
* NHBC Requirement (Must be below 0.6)
REFLECTASHIELD TF
REFLECTATHERM
BS 4016 Requirement (Must be below 0.6)
Reflectashield TF breather membrane has a vapour resistance of 0.45 MNs/g and is below the maximum permitted in BS4016, TRADA and NHBC requirements @ 0.6 MNs/g. The Haugh, Blairgowrie, Perthshire, PH10 7ER. apg5485
Telephone: (01250) 872261 Facsimilie: (01250) 872727 Email: insulation@proctorgroup.com