ROOF INSULATION Building blanket facing reflective foil laminate

What is the length of this insulation blanket?

20-metre roll, which covers 24 square metres per roll.  The thickness of the blanket is 55mm with reflective foil laminate. The width of the blanket is 1200mm.

What is the R-Value?
R-value - 1.3. This 55mm insulation blanket provides excellent thermal insulation properties, keeping homes and buildings cooler in summer and warmer in winter. When installing- the foil should face down into the roof space, and the blanket should face up against the underside of the roofing sheets.

The insulation blanket should be run at no less than 20 mm into your guttering to stop capillary action sucking water up into the blanket and making it soaking wet. This blanket does not catch on fire or conduct electricity.