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Features You Can Count On

Kingspan GreenGuard Q350 Fanfold Underlayment

One of the Most Durable Products

The 0.3" Q350 has an extruded polystyrene foam (XPS) core with high-impact polystyrene facers on both sides.

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GreenGuard FQ350 Fanfold Underlayment

Economical fanfold XPS 0.3" thick with reflective facer on one side

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