Is there a need to use metal flashing below the sill of a pre-hung door when installing it on slab-on-grade construction?
This particular case is a pre-hung wood French slider. I was going to just use a generous amount of silicone caulk under the sill, but I’ve seen some installations where the builder used a galvanized flashing that was field bent/folded to fit the opening. I’m assuming that silicone was still used.
What’s the best way? If it makes a difference, this would be occuring in Southern California.
Thanks!
Replies
I know nothing about the weather in S. Cal, cept for what I've heard in songs. But here is the thinking on a "pan" under a door that I'm aware of. It divorces the bottom of the wood threshold found on most door units from the moisture wicking (possibly) concrete slab. Some feel the same concern with a wood deck installation. Ideally, it would capture any water infiltration and spill it to the outside. What sometimes happens if not done correctly is it gives a place for the wood threshold bottom to bath (long a, I'm having a dumb attack on the spelling and am too damn lazy to go look it up). I would consider it wise if done correctly on a slab base. Best of luck.
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