I’m planning a two-story garage. I’d like to have a second floor exterior porch that is waterproof to protect the garage door opening/driveway area below. I’m waterproofing mainly so I can use the driveway area as an extension to my shop even in bad weather. I’d like to be able to run power and light fixtures underneath the porch.
I’m planning on framing the porch area with 2x8’s on 24" centers with 3/4" T&G exterior grade plywood. I’m going to slope the deck at 1/4" per foot away from the garage. The porch area is 8’x18’.
I’ve seen an article in FineHomebuilding about an EPDM membrane in a similar situation. They installed it over a fiberboard base that was fastened to the plywood subfloor with screws and large specially shaped washers. They protected the membrane with duckboards and a removable frame (that was ripped to level out the slope.) It was a pretty slick install, I thought.
My question: do I need this fiberboard stuff in this case? Is there another product (peel&stick? liquid EPDM?) that I could apply directly to the plywood and then cover with a duckboard frame? Has anyone seen a duckboard install of this size?
I’ve seen some mention in this forum about rubber tiles for placement over membrane roofing, does anyone know a brand name for these things?
Thanks for any comments.