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Do I need to use membranes when installing GA4075 below a concrete slab or screed?
Ensure that the PIR insulation boards are laid above a damp proof membrane (DPM). The foil facings of PIR insulation boards may be damaged by wet screed or wet concrete, allowing gas to escape that may weaken the floor topping, so its recommended that an additional vapour control / separating layer is used for protection over the PIR insulation boards once they have been laid, and prior to the screed or concrete topping being poured.
