Jabroof Classic Panel in a Warm Pitched Roof - Jablite

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APPLICATION: Roof insulation – warm pitched roof Product: Jabroof Panel Jabroof panel is specially designed to be incorporated into warm pitched-roof constructions to provide a high level of insulation to meet the current Building Regulations’ requirements. The panels are placed immediately below the roof covering where they also insulate the rafters, thus avoiding cold-bridging; a layer of plasterboard is fixed below the insulation to provide the necessary fire performance. 143 Roof Insulation Jabroof Panel Jabroof panels provide insulation above and between the rafters to give a warmroof construction. Cold bridging at the structural members is eliminated, substantially reducing the risk of condensation. Easy to handle Jabroof panels are manufactured from expanded polystyrene (EPS) which is lightweight and easy to handle. Permanent Jabroof Panels are rot-proof and durable and will remain effective for the life of the building. Environment Expanded polystyrene has been awarded an A+ rating by the BRE’s Green Guide to Specification. Ventilation Creating a warm-roof construction which incorporates a breathable sarking membrane removes the need for ventilation of the roof void. Rafter variations Jabroof panels are available in a range of sizes and edge-profile dimensions to suit different rafter centres and thicknesses; panels are also available with an offset edge profile to suit double-lapped rafters. Protection to services Because Jabroof panels are positioned at rafter level, the roof space remains warm, providing thermal protection to water services in the loft area. Type Jabroof panels are supplied as EPS 100 as defined in BS EN 13163 – Reaction to Fire Class E, containing a flame retardant additive. Dimensions Standard size: length – 1200mm width – to suit 600, 450 and 400mm rafter centres. Thickness: 65, 95, 145 and 190mm; other thicknesses are available to order. Edge profile rebated to suit nominal 38 or 50mm single- or double-lapped rafters. Shape The edge profile provides support for the panel on the rafter and includes a recess for the counter battens used to retain the panel in position. Figure 26.1 shows the profile dimensions. Water-vapour transmission Jabroof panel has a significant resistance to the passage of water vapour, but should not be regarded as a vapour-control layer. However, in this application, a vapour-control layer need only be considered where the system is used over areas of high humidity or high water-vapour emissions. Fire A protective layer of plasterboard must be provided to the underside of the rafters in order to provide the necessary standard of fire protection. U-values Table 26.1 shows the U-values achieved based on various thicknesses of Jabroof panel. The values given are based on a k-value of 0.036W/mK for the insulation. Their calculation complies with the procedures contained in the ‘Conventions for U-value calculations’ document. For technical information 0870 444 8769 technical@jablite.co.uk
144 APPLICATION: Roof insulation – warm pitched roof Table 26.1 U-values (W/m 2 K) Thickness (mm) 400mm centres 600mm centres 65mm 0.47 0.46 95mm 0.36 0.35 145mm 0.26 0.25 190mm 0.21 0.20 Other thicknesses are available to order. Figure 26.1 25 10 40 Dimension (mm) X Y 140 190 95 145 45 95 15 65 X Y
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Jabroof Classic Panel in a Warm Pitched Roof - Jablite

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