3H Perforated Sand Underlay – 1 x 20mtr£37.41 £44.89 (incl. VAT)
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3H TORCH ON Underlay felt – 20m x 1m roll.
This felt is ideal to use with a torch on felt system or a roll and pour system warm deck or cold deck flat roof. It can simply be nailed on with clout nails to allow flexibility in your top layer or you can bond it down to ply wood, using a bitumen solutions.