Trade Specifications
The following Trade Specifications must be read in conjunction with all other Contract documentation including; Tender Letter, Operating Procedures for All Contractors, Conditions of Contract for Works, Labour Only and Purchase Orders, General Construction Notes (England & Wales), Suppliers and Sub Contract Works - SLA and the Company's Occupational Safety, Health & Environmental Management System.
Our aim is to enable our sub-contractors and suppliers to access key Commercial information such as Terms & Conditions, Trade Specification, etc. online as soon as they are updated and revised. We hope that this will ensure that our supply chain is always fully informed as quickly as possible.
Whilst available online, this information is also available from the Commercial Departments at our Divisional offices and will form part of any contract we place (as set out in the Order).
As part of the integration work which is now underway, you will see changes being incorporated into these Trade Specifications, in the near future, to include Redrow Homes specifications. Currently, where the Barratt Homes and David Wilson Homes logo's exist, these Trade Specifications are only applicable to these brands of Barratt Redrow plc.
Please be aware that bogus web sites seeking fees for the chance of working with major contractors exist.
Jon Hayward
Commercial Director (Group)
Brickwork
Revision AA - 01.07.2024
Updated to clarify that an ARC TCB Square cavity barrier must be fixed to the timber frame panel.
Changes have been made to note that bricks stacked at build locations should be covered with appropriate protection and that walls must be protected until mortar has set to resist frost damage.
Waste requirements have been updated.
Carpentry
Revision AG - 01.01.2025
Section 4. Doors, Subsection 4.2 has been updated to note that standard height doors are to be hung on two-part hinges.
Section 8. First Fix, Subsection 8.4 updated to remove requirement for perimeter noggins to ceilings:
Carpet Floor Covering
Revision B - 01.07.2018
Group carpet ranges added to Specification.
Cavity Wall Insulation
Revision C - 01.01.2025
Section 3 Mineral Wool (Timber Frame Construction) new Subsection 3.2 and 3.3 added.
Ceramic Floor Tiling
Revision H - 01.01.2019
Health and Safety information has been updated and company brand information has been updated in-line with our current sales literature.
Cleaning
Revision K - 01.07.2018
Wording to match tick schedule aligned and general update of Health & Safety.
Demolition
Revision K - 01.08.2022
General section item h) Drug/Alcohol Testing added - the company reserves the right to test any persons on our sites for alcohol and drugs. Anyone who refuses to participate in any sampling being undertaken on site, will be asked to leave the site immediately and prohibited from working on any of the company's sites until non-negative tests have been provided.
The contractor must have an appropriate policy in place and have a programme of sampling of their workforce. From the 1 January 2023, 25% of the contractors' workforce on the company's sites must be randomly tested every 6 months. The contractor is to make reference to SHE Form 09 for policy on those individuals who provide non-negative samples.
Drylining Coving Screed
Revision AL - 01.07.2024
Contact details for SIG and CCF have been updated.
Waste requirements have been updated.
Electrical
Revision AU 01.01.2025
Section 23 Solar PV, requirements have been updated to note the Solar PV Contractor responsible for connecting and testing.
Where the invertor is located elsewhere or DC strings need to be buried in the walls, this is to be installed by the Electrical contractor at first fix. If the inverter is located outside the loft space, the Contractor is required to mechanically protect buried DC cables with steel containment complying to wiring regulation 522.6.204 or use an armoured cable suitable for DC use, for example PV Ultra Steel Wired Armoured (SWA) cable for connection and testing by the Solar PV Contractor.
Section 29 Air Source Heat Pumps, has been updated to note the Electrical Contractor's requirement to work with the Plumbing Contractor to ensure wiring locations, isolators and controls are accessible.
All external wiring must adhere to the electrical standards for outdoor equipment. It must be fixed black PVC coated Class O weatherproof and UV stable external insulation.
Electrical Downlighter Installation
Barratt / David Wilson Homes Standard Drawing DB-SD09-003
Fencing
Revision N - 01.01.2024
Section 13 Timber Surveys has been added to require the Contractor to provide annualised returns of FCS/PEFC within 14 days of request by the relevant operating Division by accurately completing and returning the standard form.
A new waste removal section has been added for the removal of waste from around the plot to the segregation area.
Fire Proofing
Revision C - 01.07.2024
Distribution details have been updated from SIG Trading to FP Herting & Son PLC for Fire and Acoustic Seal products.
Contact details have been updated for SIG Fire Protection Manager.
Manufacturers Products updated to instruct contractor to check compatibility of products used to seal service pipes.
Approved products for sealing gaps between fire door frame and supporting structure has been updated to remove Rockwool Acoustic Intumescent Sealant and add in Fire and Acoustic Seals products from FP Herting & Son PLC. This has been updated in section 4 and section 15.
Hyperlink for Hilti product CFS-CID Firestop cast-in device has been updated to the correct website for the product.
The requirement for the Contractor to complete quality assurance checks using the Company's IT system has been added.
Waste requirements have been updated.
Glass Balustrades
Revision D - 01.07.2024
Waste requirements have been updated.
Landscaping
Revision L 01.07.2024
Waste requirements have been updated.
Loft Insulation
Revision Q - 01.01.2025
References to older versions of Building Regulations have been removed.
Subsection 4.2 has been added to note that, where there is a platform installed by others in the loft space, the Loft Insulation must be reduced in thickness locally to maintain a 50mm ventilation gap between top of insulation and the underside of the platform.
Mastic
Revision R - 01.07.2024
The requirement for Everbuild 825 silicone sealant mastic on Everbuild joint backer rod at eaves between soffit and top of facing brick on Timber Frame has been added.
The schedule of materials has been updated to include for Everbuild Tecnic Joint Backer Rod for External Mastic.
Waste requirements have been updated.
Plot Groundworks
Revision AC 01.01.2025
Updates have been made to the following sections:
Section G) Group Suppliers
Subsection 5.4, Drives specification details have been updated together with British Standard references.
Subsection 8.5 wording updated to provide greater clarity on the groundworkers requirements when Air Source Heat Pumps are specified on the site.
Subsection 11.7 Filling under ground floor slab has been updated in accordance with the requirements of NHBC Standards 5.1.9 and the material must be approved as being suitable for use by the site groundworker and site Structural / Civil Engineer.
Subsection 11.9 has been updated to reflect the checks to be completed on IPCUs.
Section 11 Substructure updated to include for ARC TCB requirements to door openings on timber frame houses as per the below wording.
Plumbing and Heating
Revision AW 01.01.2025
Section h) Group Suppliers has been updated.
Section 3) Air Source Heat Pumps, Subsection 3.6 has been updated with the requirement to use Heat Pump Movers for handling ASHPs. Subsection 3.7 and 3.8 have been amended to require that anti-freeze valves to be supplied and installed by the Contractor to ASHPs. Subsection 3.10 requires that all radiator flow and return pipework for ASHP systems must be 15mm. Subsection 3.11 requires that internal primary pipework from the ASHP to the Hot Water Cylinder must be insulated with 25mm Climaflex, including pipe clips. Elbows must be insulated with reflective foil pipe wrap.
Section 11) Gutters and Rainwater Pipes has been updated to specify the gutter dimensions to detached garages.
Section 25) Schedule of Materials has been updated with part numbers for 15mm Thermostatic and Lockshield Radiator Valves by Pegler Limited added to allow for connecting 15mm pipe drops for ASHP plots.
Pre-Cast Concrete Floors
Revision - 01.01.2018
Pre-Cast Hollowcore Concrete Plank Floor trade specification.
Render
Revision J 01.01.2025
Section 3, Materials, render product for dry-dash system updated to Saint Gobain Weberend one coat dash.
Subsection 3.4 has been added to note that all render, beading, mesh, aggregate, sundries and accessories must be by Saint-Gobain Weber.
Roads & Sewers Stage 2
Revision O 01.01.25
Section 6) Wearing Course has been updated:
6.1 The Contractor shall allow for adjustment of all ironworks to the required finished levels prior to laying surfacing. The Contractor shall also make due allowance for any temporary ramps or fillets to the perimeter of all ironworks that may be required prior to completion of the surfacing works. The Contractor shall install all ironworks in accordance with adopting authority requirements and shall allow for any remedial works as necessary to repair or replace any damaged or defective works prior to final surfacing.
6.2. The contractor is responsible for ensuring all works completed by others are installed in accordance with adopting authority requirements prior to completion of any surfacing works. The Contractor shall notify the Company of any defects prior to commencement of any works.
Roads & Sewers to Binder Course inc. stage 2
Revision T 01.01.2025
Section 24) Wearing Course has been updated.
24.1 The Contractor shall allow for adjustment of all ironworks to the required finished levels prior to laying surfacing. The Contractor shall also make due allowance for any temporary ramps or fillets to the perimeter of all ironworks that may be required prior to completion of the surfacing works. The Contractor shall install all ironworks in accordance with adopting authority requirements and shall allow for any remedial works as necessary to repair or replace any damaged or defective works prior to final surfacing.
Roof Tiling
Revision AF 01.07.2024
The tile batten fixing specification of subsection 3.4 has been updated to include for a site-specific batten calculation being undertaken by the contractor.
Solar PV section has been updated to note that where panels are being installed, the Roof Tiler must liaise with the PV Solar Panel installer.
Waste requirements have been updated.
Scaffolding
Revision U - 01.01.2023
The previous 'change applicable from' date has been removed.
Solar PV
Subsection G) Distribution has been removed from Trade Specification. All subsequent lettering revised accordingly.
Section K) Sub-Contractor section updated with requirements where the inverter is located in the loft space.
Special Projects Concrete Works
Revision H - 01.08.2022
Section 16.33 item added – the company reserves the right to test any persons on our sites for alcohol and drugs. Anyone who refuses to participate in any sampling being undertaken on site, will be asked to leave the site immediately and prohibited from working on any of the company's sites until non-negative tests have been provided.
The contractor must have an appropriate policy in place and have a programme of sampling of their workforce. From the 1 January 2023, 25% of the contractors' workforce on the company's sites must be randomly tested every 6 months. The contractor is to make reference to SHE Form 09 for policy on those individuals who provide non-negative samples.
Vinyl Tile, Sheet & Laminated Flooring
Revision I - 01.07.2018
Minor notes under section 4 added regarding floor types used within the group.
Wall Tiling
Revision K 01.01.2025
Updates have been made to Palace Chemicals product references throughout the trade specification.
Window Installation
Revision J 01.01.2025
Section 8, Frame Profile, Construction & Fabrication, Subsection 8.16 has been updated to note that, where Part O (Overheating) windows are indicated, the Contractor must allow a -50mm tolerance to transom height to ensure the maximum guarding height of 1100mm (finished floor level to window opening) is not exceeded.
Subsection 9.8 has been updated to amend warranty requirements on double glazed units from 5 years to 10 years.