What Type of Caulking will adhere to Composite Decking for water proofing?

Question

I need a sealer Caulk to fill a approx. 3/8" gap between my Composite Decking boards to waterproof
and prevent water from dripping between the boards and going on to a deck below. I want the rain water to flow over the composite decking boards to the edge of the deck and run off onto a roof that will take the water away.
What is the best product for this application?
What product will adhere to and seal to Composite Decking?

Jamie M · Answer

Typically you need those gaps for expansion of the boards in hot weather- if they're tight to each other they can get damaged as they expand from heat.
They make under-deck panels that catch the water and direct it out a side that work very well. That would be a better solution than caulking, which would most likely need to be re-done every year or two anyway.

What Type of Caulking will adhere to Composite Decking for water proofing?

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