Properly installed energyguard perlite recover board roof insulation is suitable for use under built up modified bitumen and some single ply roofing systems. When the bitumized perlite is to be applied over a wood base an asphalt underlayment isnailed to the wood before the cold asphalt adhesive layer is applied. Though pricier than felt synthetic underlayments are lighter in weight better at lying flat which prevents wavy shingle installations and offer superior water resistance so much so that the high end synthetic underlayments can serve as temporary short term roof covers.
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