I'm wondering what's the best approach to building a deck with a floor
that's waterproof to keep rainwater from going through into a sunroom below
This is what I'm currently thinking:
Construct the deck joists to take a plywood deck. Cover the plywood deck
with rubber roofing membrane. Then, place the deck floor over the roofing
membrane. I'm thinking I could use Trex (or a similar decking) over the
membrane, attaching it through the membrane with deck screws but applying
the same sealant used to fuse the roofing membrane edges between the deck
boards and the membrane to seal the screw penetrations through the membrane.
Or, perhaps, the deck boards could simply be fused to the membrane without
the use of other attachment?
I've seen this kind of arrangement, with a deck area over a screened-in
porch or over a sunroom, but don't know how it's accomplished.
Anyone know how this is normally done?