Available in 100mm for masonry construction & 140mm for timber frame construction
Rackham Housefloors Ltd Mill Street East, Dewsbury West Yorkshire, WF212 9TA Tel: 01924 455876 Fax: 01924 466513 E-mail: sales@rackhamhousefloors.co.uk Website: www.rackhamhousefloors.co.uk
RACKHAM
HOUSEFLOORS Rackham Beam & Block Closure Block
Rackham Closure Blocks are quick and easy to lay and eliminate all brick infill between floojoists at perimeter and internal junctions.
140mm
100mm 440mm 440mm 100mm
100mm
70mm
70mm
100mm wide closure blocks for masonry construction
140mm wide closure blocks for timber frame construction
Manufactured in accordance with BS 6073: Part 1: 1981 (Specification for precast concrete mansonry units) with a minimum compressive strength of 10N/mm2
CI/SfB (23.4
Rackham Housefloors Ltd
Xf2
Certificate No 85/1566
DETAIL SHEET 4
RACKHAM HOUSEFLOORS TYPE 175 PRESTRESSED CONCRETE JOISTS
Product • THIS DETAIL SHEET REPLACES DETAIL SHEETS 2 AND 3 AND RELATES TO THE RACKHAM HOUSEFLOORS PRESTRESSED CONCRETE FLOOR JOISTS, TYPE 175, THE CODE OF PRACTICE OF THE CERTIFICATE HOLDER COVERING THE SPECIFICATION OF CONCRETE INFILL BLOCKS, FLOOR FINISHES TO BE USED WITH THE JOISTS AND THE INSTALLATION PROCEDURES FOR JOISTS, INFILL BLOCKS AND FLOOR FINISHES. • The product is for use in: (a) suspended ground floors in dwellings or first floors in single occupancy dwellings, in conjunction with concrete infill blocks with screed, polystyrene/chipboard or mastic asphalt floor finishes; (b) domestic garage floors, in conjunction with concrete infill blocks with reinforced screed finishes; (c) compartment and separating floors in dwellings, in conjunction with concrete infill blocks of minimum density 1800 kgm–3 and an appropriate dense screed and resilient and floating layers or a soft covering. This Detail Sheet must be read in conjunction with the Front Sheet and Detail Sheet 1, which give Conditions of Certification and the product’s position regarding the Building Regulations, respectively.
Technical Specification 1 Description 1.1 The Rackham Housefloors Type 175 system comprises types 2, 3, 4 and 5 prestressed concrete floor joists (see Figure 1), and the Rackham Housefloors Ltd's code of practice for incorporating the concrete infill blocks. The code of practice includes design criteria, typical installation details (see Figure 2), handling requirements for the concrete infill blocks and the installation requirements for screed, chipboard/polystyrene and mastic asphalt floor finishes. 1.2 The joists are designed in accordance with BS 8110: Parts 1 and 2 : 1985. 1.3 The joists are made of C60 (60 Nmm–2 at 28 days) concrete prestressed by means of 5 mm indented steel wire, to BS 5896 : 1980, having a minimum tensile strength of 1670 Nmm–2. The type number of a joist denotes the number of prestressing wires (see Table 1). 1.4 The concrete is made with ordinary Portland cement (OPC) complying with BS 12 : 1989 and aggregates in accordance with BS 882 : 1983.
Table 1 Joist type
Location of prestressing wires Distance from top surface (mm)
Number of wires
2
115 132.5
1 1
3
80 147.5
1 2
4
80 115 147.5
1 1 2
5
80 115 132.5 147.5
1 1 1 2
1.5 The type 175 joists are made by casting concrete around prestressing wires in long steel moulds with individual joists being separated by polystyrene inserts. The wires are pretensioned over the full length of the mould and supported in position at intervals. When the concrete has achieved adequate strength the prestressing wires are cut and the joists removed from the moulds.
Readers are advised to check the validity of this Detail Sheet by either referring to the BBA’s website (www.bbacerts.co.uk) or contacting the BBA direct (Telephone Hotline 01923 665400).
CI/SfB (23.4)
Rackham Housefloors Ltd
Xf2
Certificate No 85/1566
RACKHAM HOUSEFLOORS TYPE 225 PRE-STRESSED CONCRETE JOISTS
DETAIL SHEET 5
Product • THIS DETAIL SHEET RELATES TO RACKHAM HOUSEFLOORS PRESTRESSED CONCRETE FLOOR JOISTS, TYPE 225, AND THE CODE OF PRACTICE OF THE CERTIFICATE HOLDER COVERING THE SPECIFICATION OF CONCRETE INFILL BLOCKS AND FLOOR FINISHES TO BE USED WITH THE JOISTS AND THE INSTALLATION PROCEDURES FOR JOISTS, INFILL BLOCKS AND FLOOR FINISHES. • The product is for use in: (a) suspended ground floors in dwellings or first floors in single occupancy dwellings, in conjunction with solid concrete infill blocks with screed, polystyrene/chipboard or mastic asphalt floor finishes (b) domestic garage floors, in conjunction with 7.0 Nmm–2 solid concrete infill blocks with reinforced screed finishes (c) compartment and separating floors in dwellings, in conjunction with solid concrete infill blocks with a minimum density of 2000 kgm–3 and resilient and floating layers or an appropriate dense screed and a soft covering (d) suspended ground and first floors in commercial and light industrial buildings (for superimposed distributed loads up to 5.0 kNm–2) in conjunction with 7.0 Nmm 2 solid concrete infill blocks with screed finishes. This Detail Sheet must be read in conjunction with Detail Sheet 1, which gives the product’s position regarding the Building Regulations and Conditions of Certification.
Technical Specification
Figure 1
Joist cross-section
1 Description
1.3 The joists have an overall depth of 225 mm and are pre-stressed by seven 5 mm diameter indented steel wires, to BS 5896 : 1980, with a minimum tensile strength of 1670 Nmm–2 (see Figure 1).
37.5
72.5
160
100
90
55
1.2 The joists are designed in accordance with BS 8110 : Parts 1 and 2 : 1985.
100
90
1.1 The Rackham Housefloors Type 225 joist is a pre-stressed concrete floor joist (see Figure 1), for use with solid concrete infill blocks in accordance with the company’s code of practice to form suspended floors. The code of practice (see Figure 2) includes design criteria, typical installation details, handling requirements for the concrete infill blocks and the installation requirements for screed and chipboard/ polystyrene floor finishes.
40 150 all dimensions in mm
Readers are advised to check the validity of this Detail Sheet by either referring to the BBA’s website (www.bbacerts.co.uk) or contacting the BBA direct (Telephone Hotline 01923 665400).
ISO 14001 Registered Company
113
Certificate 10/E006-1 This is to certify that the Management Systems operated by: Rackham Housefloors Limited Mill Street East Dewsbury West Yorkshire WF12 9TA
for the manufacture and supply of 175 mm and 225 mm pre-stressed concrete floor beams and supply of associated ancillary products including polystyrene infill panels have been assessed and registered by the BBA as meeting the requirements of:
EN ISO 14001 : 2004 Environmental Management Systems
Signed on behalf of the British Board of Agrément: Date of issue:
8 October 2010
Expiry date:
7 October 2013
British Board of Agrément, Bucknalls Lane, Garston, Watford, Hertfordshire WD25 9BA Telephone: 01923 665300 Fax: 01923 665301
©2010
e-mail: mail@bba.star.co.uk website: www.bbacerts.co.uk