Celotex Insulation Board - GA4000

Yes, it is highly effective for roof insulation, whether between rafters or as part of a warm roof construction.

While the foil facings provide some resistance, always consult local building regulations regarding moisture control and the specific requirements for your building type.

A standard handsaw or a sharp insulation knife is sufficient. For best results, use a straight edge as a guide.

It is a PIR insulation board designed to meet building fire safety standards, but it is not a non-combustible material. Always follow fire safety building regulations for your installation.

Installation should always occur in dry conditions. The boards themselves are moisture-resistant but should not be exposed to standing water or saturated environments.

The thermal resistance (R-value) depends on the thickness of the specific board used. You can calculate it by dividing the thickness (in meters) by the thermal conductivity (0.022W/mK).

Use a fine-toothed hand saw to trim the board, ensuring a snug but not forced fit to prevent bowing.

Apply high-quality foil tape over all joints to create a continuous thermal and vapor-resistant seal.

Small surface nicks are acceptable; however, if the foil facing is torn, repair it with metallic insulation tape to maintain low emissivity properties.