Permo® therm, from Klober, is a phenolic insulation board with a tongue-and-groove edge profile, integrated vapour roof permeable underlay and self-adhesive strips along laps. The product has been designed for above-rafter insulation and offers the added convenience of combining two roofing disciplines in one product. It can be laid on boarded or un-boarded roofs either from left to right or from right to left and is available in various thicknesses. Suitable for all pitches, boards are accompanied by a range of fittings for ease of installation, optimum thermal performance and airtightness.
facing upwards. Laps are then sealed by removing the release film from the adhesive strip and after either a single or double course counterbattens are laid in alignment with the rafters. These are simply screw-fixed through the boards to the boards prior to tiling battens being fixed.