The TopShield® Q250TS Siding Underlayment comprises 0.2" thick closed-cell extruded polystyrene (XPS) in bundles of 4 Ft x 48 Ft. It is lightweight and easy to cut and install. The underlayment is designed to be used as a "leveling board", adding insulation and moisture protection in installation of new vinyl siding over old siding.
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