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Trade Specifications

tagged "Roof Tiling"

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 AB 01.08.2021

Section l) has been amended to request that the Roof Tile Contractor is to ensure instruction to proceed has been provided by the Site Manager. No roof tiling works must be commenced before confirmation is given from the Site Manager that these works have been completed and the plot is available for roof tiling works to commence.

Section 1.2 has been updated to add to the works that the Contractor is to price 60mm thick layer of rock/stone mineral wool to be laid above the party wall and sandwiched between the roof membrane and the underside of the roof tile.

Section 11.1 has been updated to remove the requirement for all Contractors to be accredited to one of the following; FIRAS, BM Trada, IFC, LPCB.

Sections 11.2 have been updated to reflect only those works to be carried out by the Roof Tile Contractor.

Revision AA 01.07.2021

Section 2.3 – reference to Manthorpe G1280 felt support tray deleted.

Section 7.3 – where insulation is installed over horizontal ceilings, ventilation trays positioned over the truss rafters and below the underlay must be installed and provide a minimum 25mm continuous air gap. Roofing contractors must supply the right Manthorpe eaves vent tray and install it in the correct position to ensure it works effectively by providing the correct amount of ventilation to the roof space. Using the wrong tray or installing in the incorrect position could result in condensation being evident within the roof space, which is difficult to rectify. NO OTHER MANUFACTURERS PRODUCTS ARE TO BE USED.

Table added to demonstrate which tray should be used for different roof pitches.

Section 11.1 – All Contractors installing Cavity Barriers on High Rise Structures (5 storeys and above) must be accredited to one of the following; FIRAS, BM Trada, IFC, LPCB.

Section 11.7 – Tenmat FF102 Ventilated Fire Barriers, for fire protection in areas of Vertical Tiling.

Section 20.1 – eaves ventilation G503 and G504 added.

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.