UNDER DECK CLAMPS

Under deck clamps are essential for securely installing roof drains, particularly in all configurations except poured-in-place setups. Without these clamps, drains may shift under the weight of snow and rain or due to material expansion and contraction, leading to flexing and potential failure of the roofing membranes.

Retro Drain Sizing Chart

I.D. of the Existing Drain Leader Platinum Drain Size (O.D.) Fits Into Pipe (I.D.) Large End of Seal (Max. Expansion) Note
2″
1 ¾”
2″
NA
Coupler Required
3″
2 ¾”
2.87″ – 3.25″
3.34″
3″ Drain Seal Required
4″
3 ¾”
3.87″ – 4.12″
4.13″
4″ Drain Seal Required
5″
4 ¾”
4.87″ – 5.25″
5.39″
5″ Drain Seal Required
6″
5 ¾”
5.87″ – 6.12″
6.22″
6″ Drain Seal Required

Under Deck Clamps


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