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Trade Specifications

The following Trade Specifications must be read in conjunction with all other Contract documentation including; Tender Letter, General Terms, Conditions of Contract for Works, Labour Only and Purchase Orders, General Construction Notes (England & Wales), Suppliers and Sub Contract Works - Customer Charter 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).

Please be aware that bogus web sites seeking fees for the chance of working with major contractors exist.

Jon Hayward
Senior Group Commercial Manager

Roof Tiling

Revision Z 01.08.2020

h) Health and Safety

Leadwork section updated with deleted section from the Plumbing and Heating trade specification.

Revision Y 01.01.2020

Underlay – The previous reference to Protect A1 T3 HR roof underlay to be used in all timber frame units has been deleted. Refer to 2.1 for Underlay requirements.

11.2 Fire Stopping - Above Party Wall and Roof Membrane.

(i) Install 60mm thick layer of rock/stone mineral wall placed above party wall and roof membrane, to extend the full width of the spandrel below.

(ii) Laid between roof battens from eaves to ridge.

(iii) Ensure void above roof membrane is filled with rock/stone mineral wall to underside of tile profile.

(iv) Additional mineral may be required dependent on tile profile.

Above changes to 11.2 following the withdrawal of the ARC tile batten barrier.

Revision X 20.09.2019

Reference has now been made to the Company Timber Sourcing Policy; Contractors must purchase all timber via suppliers with FSC or PEFC chain of custody certification accreditation.

Section 2.2 - The Contractor is to ensure that protect A1 T3 type HR roof underlay is used for all Timber Frame construction units.

Fire Stopping section 11 updated to reference ARC products.

Revision W 01.07.2018

Four clause paragraphs have been reworded for clarity 3.13, 12.3, 17.5 and 18.5 in relation to the installation of roof light windows and baby/mini ridges.

Revision V 01.01.2018

Supplier information changed.

15.4 Rewording - Cut plain tiles are not acceptable. Purpose made plain tile-and-a-half or half tile must be used. Additionally, cut single lapped interlocking tiles must not be used unless unavoidable in which case cut tiles less than half the normal cover width must either be adhesively bonded to adjacent full tile using a suitable sealant or mechanically fixed to adjacent tile using a minimum of two fixings.

Revision U 01.07.2017

Formatting changes only.


Revision S 20.09.2019

Applicable for all Scaffolds erected from 1st October 2019.

Within section 11.6 Loading Bays. The use of bowstring transoms within loading bay structures is not permitted. Only loading bay transoms to be utilised.

Revision R 01.01.2019

The trade specification has been reviewed and updated following a review by the Group SHE Management team.

Scaffold Appendices are located HERE

Revision Q 01.07.2018

A full review of the Scaffolding trade specification has been completed and is required for all scaffold erected from the 1st September 2018.

Competency requirements have changed from OHSA 18001 to ISO 45001.

Health and safety requirements have been added to the General section.

A number of minor changes have been made with the specification paragraphs of "should" to "must".

A significant amount of rewording has been made with the remaining sections with a number renumbered and requirements added.

Appendices have been noted that refer to additional information contained on the Barratt Commercial Support website or appended to the trade specification.

Revision P 01.01.2018 a

5.2 The removal of table lifts exempt from having gates also appendix 10 section 18.

7.6 Rewording - Brick guards must be provided by the Contractor on all working lifts which are secured to the guardrails and their lateral movement prevented. They must be capable of supporting the weight of any materials liable to fall against them. This can be achieved by a proprietary guardrail/toeboard system if this is deemed appropriate. (Note: from 1 January 2016, these must be heavy duty plastic or plastic coated metal and self-securing).

9.2 Rewording - End caps must be fitted to the external facing transoms where the tube protrudes more than 50mm past the fitting & is below 2m from the walking surface. Where standards exceed 2m from the working platform, there is no requirement for end caps

Revision O 01.07.17

Alterations to this specification are as reviewed with recommendations from Vince Coyle.

1.14 It is the Contractor's responsibility to provide all tools/equipment as required. Any electrical tools/equipment brought onto site must be battery operated or 110v and have been appropriately tested/inspected. The operatives must have received the appropriate training for the tools/equipment being used and have relevant certification. The contractor must maintain a register of work equipment inspections as required by PUWER and evidence of training.

2.13 Designs which are required, and are not detailed within this specification will be specific to the site i.e. pedestrian walkways, protection fans etc. These must be approved prior to the commencement of work. The designs must be within TG20 design criteria or approved by an accredited designer.

5.1 has been re-worded

5.4 added Ladder safety rail to be installed on all externally positioned ladders.

5.6 amended Ladders must be adequately secured as per TG20 guidelines or with designed brackets, to prevent sideways and outwards movement, at the correct angle of 75° and extend 1m above any landing point. Transom clips are not permitted.

5.8 added Table lifts must be provided with self-closing gates as specified for external platform access points.

7.3 added Gable handrails to prevent falls from roofs where that distance exceeds 1.5m with a minimum roof height for roofer's access of 2.0m, the handrails from plan position are a minimum of 100 mm from the roof edge and a maximum of 225 mm. see appendix 11.

Note appendix 11 has been altered with the addition of the above including diagram and tables provided by Vince Coyle.

7.5 has been re-worded

8.8 amended The scaffold boards on the internal edge of the working platform must be secured to prevent them becoming dislodged at a minimum of two fittings must be provided as close as practicable at either end of the board.

8.9 added Where lapped boards on system scaffold occur, these must be secured with mechanical fixings.

9.2 amended End caps must also be fitted to the external facing scaffold transoms and to the top of internal standards where these protrude the working platform to avoid injury to persons coming into contact with them. Tubes must not protrude more than 50mm past the fitting on all scaffolds below 2m.

13.5 has been re-worded

19.4 added The designated Supervisor must provide a weekly SHE Inspection of the company's activity. This must include compliance with the current scaffold specification, as well as other SHE management elements identified in this specification. The weekly inspection must be presented to the company.

Vinyl Tile, Sheet & Laminated Flooring

Revision I 01.07.2018

Minor notes under section 4 added regarding floor types used within the group.

Revision H 01.01.2018

1.12 Rewording - All flooring is to be laid using Amtico or Moduleo approved adhesive and used in accordance with the manufacturer's instructions, specification and recommendations with suitable floor preparation for the above flooring systems.

1.13 Rewording - All edges of vinyl flooring are to be sealed to skirting and doorways in accordance with the manufacturer's instructions and specification. NO SILICONE SEALANT MAY BE USED FOR 72 HOURS AFTER FLOORING HAS BEEN INSTALLED TO ALLOW ADHESIVE TO FULLY SET.

2.1, 2.2 & 2.3 Addition of or other liquid sealer / primer, or other appropriate specialist & or similar.

2.1 Rewording - Areas OF 12m2 OR Over Must be fully adhered to the sub floor.

3.4 Rewording - Gaps between the skirting & floor finish must not exceed 3mm for vinyl sheet and for Laminate/wood, a minimum of 8mm (if installed before skirtings boards there would be no gap.

Revision G 01.07.2017

This spec has had a major update to include Amtico, Moduleo & quickstep floor coverings. Based on customer care issues, noise,
subcontractor feedback and fitting guides from manufacturers.

Wall Tiling

Revision I 01.07.2017

Formatting changes only.

Revision H 01.10.2016

Addition of 1m² of spare tiles to be left in the property, as noted in section 16.4

Window Installation

Revision F 01.08.2020

9.18 – Note added - The Contractor is to ensure that the anti-rattle keys/buffers are colour matched to the Window.

Revision E 01.01.2020

Section 15.6 – Ventilation.

Windows (not including Bays) and French Doors (not including Bays) are to have a standard outer frame and be fitted with a upvc overhead vent profile which houses the ventilators.

Bay Windows and Bay French Doors are to have a standard outer frame with a 25mm extension profile in which the ventilators are 'through frame' and NOT by means of an overhead vent profile.

Revision D 20.09.2019

A new section has been added 9.18 Glazing – Integral Georgian bar cruciforms must be fitted with ant-rattle keys / buffers (or equivalent).

Revision C 01.07.2018

Minor revision to the rewording of paragraph 9.12.

Revision B 01.01.18

Eurocell contact information changed. Cavalok contact added.

Revision A 01.05.17

Means of escape windows updated.

Special Projects Concrete Works

Revision G 01.08.2020

General update to include all current Health & Safety requirements, since last Revision F dated November 2013.