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Installation
Before installing thermal insulation, ensure that:
- The surfaces to be covered are firmly fixed, clean, dry, smooth, free from frost, contaminants, voids and protrusions
- All preliminary work including formation of upstands, kerbs, box gutters, sumps, grooves, chases, expansion joints, etc and fixing of battens, fillets, anchoring plugs/strips, etc, is complete and satisfactory
- The supporting deck should be clean, dry, without large projections or steps or gaps and should be graded to provide the correct falls to rainwater outlets
- Where appropriate, it should be primed to accept bitumen or adhesive bonding of the VCL.
- The roof insulation boards should be laid break-bonded and installed strictly in accordance with the manufacturer’s recommendations
Where appropriate, the manufacturer should be consulted regarding the spanning, cantilever capability and installation technique of the insulation board. Where membranes are to be adhered to the face of the insulation board, check that the adhesive and insulation are compatible and tape insulation board joints as necessary.
The correct mechanical fastener for the particular substrate will be recommended by the Insulation/membrane manufacturer and/or fastener supplier and should comply with Clause 2, UEAtc directive; “Supplementary Guide for the Assessment of Mechanically Fastened Waterproofing” (less than 15% corrosion after 15 cycles in a Kesternich cabinet). When using dissimilar metals, the risk of galvanic corrosion must also be assessed. The minimum recommendations for thermal insulation pressure plates have been agreed within SPRA and are tabled below:
| Thermal Insulation |
Pressure Plate Dimensions |
Minimum No. Fasteners Per Board |
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PUR/PIR/PF
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70mm x 70mm square or 75mm round
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11 per 2.4m x 1.2m board
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Mineral wool
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70mm x 70mm square or 75mm round
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1 per 1.2m x 0.6m board
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1 per 1.8x 0.6/1.2m board
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EPS/XEPS
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70mm x 70mm square or 75mm round
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3 per board
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Note 1: The fastener requirement will increase for membrane systems bonded with adhesive.
Note 2: The number of fasteners required for mineral wool products is subject to individual manufacturer approval, which should be based on wind uplift testing undertaken by the same.
© 2006 Sarnafil Ltd. Legal Disclaimer
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