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Celotex Roof Applications

1 Pitched roof sarking

The void created by a pitched roof can be made habitable by insulating along the plane of the roof pitch with Celotex rigid PIR insulation boards. This creates a warm, potentially habitable roof space in which water pipes and tanks no longer need to be insulated.

When used over the roof structure as insulating sarking, Celotex insulation creates a warm roof structure and eliminates thermal bridging at the rafters, whilst the foil facings, used in conjunction with taped joints, provide an effective barrier to moisture vapour and air leakage. The use of a single continuous layer of insulation over the rafters thereby eliminates the risk of condensation and avoids the need for ventilation of the rafter space. Where very low U-values are required Celotex recommends a two-layer system in order to reduce the racking forces on the fasteners required to fix counter-battens to rafters. In this system, the first layer of insulation is applied as a complete layer over the rafters.

A second, thinner layer is then fitted over the first layer, between the counter-battens.

See installation guide for more details

http://www.celotex.co.uk/downloads/PitchedRoofSarking.pdf

* This is the maximum discount achievable if you buy in bulk. Discounts calculated automatically.
Click on any underlined product name to link to a full product detail page.
Product Name Size Unit Price Multi-Buy Price* Qty. SubTotal Final Price Ex VAT Discount %
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2 Insulation between and over rafters

Where headroom and rafter depth is limited, Celotex Insulation may be fitted between and over the rafters.

The void created by a pitched roof can be made habitable by insulating along the plane of the roof pitch with Celotex rigid PIR insulation boards. This creates a warm, potentially habitable, roof space in which water pipes and tanks no longer need to be insulated.

Where headroom and rafter depth is limited, Celotex insulation may be fitted between and over the rafters. If this two-layer solution is chosen, it is important that the thermal resistance of the inner layer (between the rafters), is less than that of the outer layer (over the rafters).

This reduces the risk of interstitial condensation between the insulation layers. The condensation risk also depends upon occupancy and building use. Celotex therefore recommends that a condensation risk analysis is obtained to determine the optimum solution for individual projects. Please contact the Celotex Technical Advisory Service for further information.

See installation guide for more details

http://www.celotex.co.uk/downloads/Between&OverRafters.pdf

3 Insulation between rafters

The void created by a pitched roof can be made habitable by insulating along the plane of the roof pitch with Celotex rigid PIR insulation boards. (GA3000 Range) To buy click here Celotex GA4000 range boards

This creates a warm, potentially habitable roof space in which water pipes and tanks no longer need to be insulated.

If BS 747: 2000 slater's felt is being used, a minimum 50 mm ventilated air space must be provided between the felt and the cold side of the insulation in order to minimise the risk of condensation formation. This construction is known as a ventilated construction.

With some breathable membranes, the cold side of the insulation may be placed in direct contact with the membrane (check with membrane supplier prior to specification). However, the outer side of the membrane must be adjacent to an air space to allow moisture vapour to escape to the outside of the building. This is known as an unventilated construction.

See installation guide for more details

http://www.celotex.co.uk/downloads/BetweenOrBetween&UnderRafters.pdf

4 Insulation between and under rafters

The void created by a pitched roof can be made habitable by insulating along the plane of the roof pitch with Celotex rigid PIR insulation boards.

This creates a warm, potentially habitable roof space in which water pipes and tanks no longer need to be insulated.

If sarking felt is being used, a minimum 50 mm ventilated air space must be provided between the felt and the cold side of the insulation in order to minimise the risk of condensation formation. This is known as ventilated construction.

With some breathable membranes, the cold side of the insulation may be placed in direct contact with the membrane (check with membrane supplier prior to specification). However, the outer side of the membrane must be adjacent to an air space to allow moisture vapour to escape to the outside of the building. This is known as an unventilated construction.

See installation guide for more details

http://www.celotex.co.uk/downloads/BetweenOrBetween&UnderRafters.pdf

5 Loft Conversions

Insulating a loft area will frequently require many different insulation solutions involving walls, as well as pitched and flat roof areas.

One of the most common alterations made to older houses with pitched roofing is to convert the loft space into a habitable living space. This can add value to an existing property and, in many cases, allows families to grow without having to move from a favoured property.

The creation of a habitable space also requires the incorporation of adequate thermal insulation to meet the requirements of the building regulations. The major benefit of using Celotex PIR insulation boards is that the efficiency of the product allows the occupants to lose the minimum of internal space - thereby maximising the internal space.

Insulating a loft area will frequently require many different insulation solutions involving walls, as well as pitched and flat roof areas.

See installation guide for more details

http://www.celotex.co.uk/downloads/LoftConverions.pdf

5 Mechanically Fixed, Single-Ply Flat Roofing Systems

Flat roof insulation solutions where a mechanically fastened single-ply membrane is to be used to weatherproof the roof structure.

When designing a flat roof using Celotex Tempchek TA3 boards, three basic principles apply:

  1. Design to a fall of 1:80, 1:60 or 1:40 as appropriate to the weathering system, type of deck and construction tolerances.
  2. Have due regard for the use and design of the building and the need to ensure that the design will not allow a build up of moisture below the waterproofing membrane.
  3. Provide adequate protection for both insulation and waterproofing if significant foot traffic is expected either during or after completion of the roof.

Mechanically fixed, single-ply flat roofing systems

Installation Instructions

http://www.celotex.co.uk/downloads/Tempchek%20TA3.pdf

* This is the maximum discount achievable if you buy in bulk. Discounts calculated automatically.
Click on any underlined product name to link to a full product detail page.
Product Name Size Unit Price Multi-Buy Price* Qty. SubTotal Final Price Ex VAT Discount %
TD4096 96mm 90mm Insualtion + 6mm ply ( Normally only available in packs of 12) 2400mm x 1200mm £58.50 £54.99 
£0.00 £0.00 0.00 %
TD4126 126mm 120mm Insualtion + 6mm ply (Normally only available in packs of 9) 2400mm x 1200mm £71.20 £66.93 
£0.00 £0.00 0.00 %
  £0.00