Labels:hakham | window OCR: Prev Next Water Management of the Building Envelope Roofing Underlayments extruded Extremely LowP erm Underlavyment cluminiurn low polyethylene donsity What is it used for or what does it do? Vapor retarder membrane used for above grade work such as wall, beneath pooM flooring and roof assemblies Sea aled membrane joints mean moisture mov vement through wall or roof assembly IS minimized Excellent membrane for moisture retardation bicurn Where is it used? Icw density grio polyester Roof underlayment. what is it made polyelhylene of? Vapor retarder for above grade work. Multi- layer virgin low density polyethylene such as wall and roof assemblies incorporating I multi- filament reinforced scrim and aluminum Perm Underlavment pumini polvethylene Wood Sealed movement bicwn polveste laver dens ...