Superfoil SF19BB Breathable Insulation 1.5M x 10M Roll 15.0 M2 Reflective Breather Membrane & Thermal Insulation Combined For Roofs & Walls. Watertight W1 & Breathable 40mm Thickness For technical details please refer to the PDF data sheet which we link to below in the "Additional Information" notes. Product normally requires a minimum of 25mm air gap either side of the multi-foil to ensure that this product works in the way that it was designed to.
SUPERFOIL SF19BB 1.5M X 10.0M ROLL 15.0M2
PDF data sheet at this link - www.bmdinsulation.com/SF19BB.pdf
Product requires installation in accordance with manufacturer details - If in doubt then please follow manufacturer instructions and advice.