I need to build a recreational deck on a newly-rebuilt
flat roof that has a 2-ply "rubber" torch-welded membrane.
The new roof is framed with 3/4" plywood screwed down
on to 2x8's, 12" o.c., and is *very*
I was originally planning on doing the following:
1. Lay 2x4 P.T. "sleepers" on the membrane, 16" o.c.
2. Screw 2x6 P.T. boards on to the sleepers perpendicularly,
using three #8x2.5" green deck screws at each "intersection".
3. Leave a "nail's width" between each decking board.
4. Wait a year, then stain the P.T. decking with an oil-based stain.
Recently, I have received several suggestions from friends and
am not sure which suggestions are good and which aren't. Here
1. Glue down the sleepers on the membrane.
2. Glue down 4" strips of 1" thick rigid foam insulation on the
membrane then glue the sleepers on to the foam.
3. Use 2x6x5/4" decking instead of 2x6 lumber.
4. Use 2x4 lumber instead of 2x6 lumber.
5. Don't leave any space between the decking boards.
6. Don't *ever*
stain the P.T. boards.
7. Use cedar decking boards, not P.T.
Does anyone have any ideas regarding any or all of the above
7 suggestions? Many thanks.