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Xtratherm TR/BGM is a high performance polyisocyanurate (PIR) tapered roof insulation with a polypropylene fleece finished bitumen/glass fibre working surface and a mineral glass facing to the under side (TR/BGM boards are not reversible).

TR/BGM is suitable for use below most bitumen based partially bonded built up roofing systems. Part of Xtratherm’s comprehensive range of high performance tapered roof boards providing total solutions for tapered roof projects.

General information
Specification data - Polyisocyanurate (PIR) foam boards
Product Reference



30–50 mm

50–70 mm

70–90 mm

90–110 mm

Standard product features


To BS EN 13165.

Board size:

1200 x 1200 mm.

Thermal conductivity (lambda value):

0.024–0.027 W/m·K.

Edge profile:

Straight edge.

Product Options


Other tapers available dependent on quantity and lead time.

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