The FQ250 has an extruded polystyrene foam (XPS) core with high-impact polystyrene facers on one side with a reflective facer on the other for added energy.
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When every penny counts, you can rely on the performance of our most economical fanfold siding underlayment. The 0.2" Q250 is made of extruded polystyrene foam (XPS). Designed to be used as a “leveling board”, it adds insulation and moisture protection during the installation of new vinyl siding over old siding. It is configured in fanfolded bundles 4’ x 48’. It comes with crease-fold hinges and a reflective facer on one side for added energy efficiency.
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