Jabroof Classic Panel in a Warm Pitched Roof - Jablite

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147 Roof insulation – warm pitched roof Lapped rafters If lapped rafters occur in the run, a specially-designed Jabroof panel is available to accommodate the wider rafter opening required on one side. These panels are 1200mm long and are intended to be cut to length on site; at either side of the lapped rafter, these panels will match the profile of the standard Jabroof panels. Figure 26.5 Jabroof panel section with lapped rafters 1 2 3 1. Jabroof panel 2. Roof tile and batten system 3. Breathable sarking membrane 4. 12.5mm Plasterboard 5. Treated timber counter batten 6. Ventilated void 7. Double rafter Roof Insulation Maintaining the insulation envelope In order to complete the insulation envelope and to prevent the occurrence of cold bridges and areas of discontinuity in the insulation, the Jabroof panels should meet the wall and gable insulation; any gaps should be filled with a suitable in-situ expanding foam sealant. Ridges, abutments and other penetrations should also be sealed. 4 5 6 7 Breathable sarking membrane A proprietary breathable roof-tile underlay should be installed over the counter battens and detailed at the eaves, gables, valleys etc in accordance with the manufacturer’s recommendations. Details of suitable products are available from Vencel Resil’s technical services department. Tile battens and tiles The tile battens should be fixed to the counter battens using 3.35mm diameter nails, 65mm long, and the tiles installed in the normal manner. The work should be carried out in accordance with BS 5534:Part 1, and following the tile manufacturer’s instructions. Internal finish The underside of the rafters should be lined with 12.5mm thick plasterboard and finished as required. This provides mechanical protection to the insulation and provides the required degree of fire performance. Vapour-control layer A vapour-control layer is not an essential part of the normal specification. However, if conditions of use are such that consistently high levels of moisture vapour will be present in the roof space, it is suggested that a vapour-control layer be positioned immediately behind the protective layer of plasterboard. References BS 5534 Code of practice for slating and tiling. Part 1 Design. BS EN 13163 Thermal insulation products for buildings – Factory made products of expanded polystyrene (EPS) – Specification. For technical information 0870 444 8769 technical@jablite.co.uk
200 Jablite Expanded Polystyrene (EPS) Technical Information Jablite EPS is a lightweight cellular plastic material suitable for a wide range of buildinginsulation applications. It is an excellent insulating medium which exhibits consistent thermal performance over the range of temperatures normally encountered in buildings. The material is versatile, light in weight, clean and easy to handle, and provides a cost-effective means of including permanent insulation in floors, walls and roofs to meet, and exceed, the standards laid down in the Building Regulations. Technical Description Composition Jablite insulation products are manufactured from EPS. The material comprises expandable beads of polystyrene pre-foamed and fused together in a steam-heated mould under pressure. This produces a block of material, up to 7314mm long, which is then cut to and/or shape. After cutting to size, the material may be faced or laminated with other materials to suit its application. Alternatively, the beads may be moulded into a finished, shaped section which requires no further processing. Material Type The following types of material are available, as defined in BS EN 13163: EPS 70, EPS 100, EPS 150, EPS 200, EPS 250. In addition, each type is available as either Euroclass F, or Euroclass E containing a flame-retardant additive. Additional types are also available for specific applications; for example, types with compressive-stress values, at 10%, of 400 and 500kPa. Typical properties of Jablite Jablite Type Mechanical Properties Compressive strength @ 10% compression (kPa) Compressive strength @ 1% nominal strain (kPa) EPS 70 EPS 100 EPS 150 EPS 200 EPS 250 70 100 150 200 250 20 45 70 90 100 Bending strength (kPa) 115 150 200 250 350 Moisture Properties Water vapour diffusion resistance factor µ Water vapour permeability δ mg/(Pa.h.m) 20-40 30-70 30-70 40-100 40-100 0.018-0.036 0.010-0.024 0.010-0.024 0.007-0.018 0.007-0.018 Vapour resistivity (MNs/gm) 145 200 238 238 238 Thermal Properties Thermal conductivity (W/mK, at 10ºC) 0.038 0.036 0.035 0.034 0.034 Thermal resistivity (mK/W) 26.32 27.78 28.57 29.41 29.41 Shape and size After moulding, the ‘block’ material is cut to size, thickness and taper, if required, according to the intended end use; see individual product and application data.
Page 2 and 3: APPLICATION: Roof insulation - warm
Page 4 and 5: 145 Roof insulation - warm pitched
Page 8 and 9: 201 Technical Description (continue
Page 10: For more information about Jablite

Jabroof Classic Panel in a Warm Pitched Roof - Jablite

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