Forum Title: Exterior Subfloor Theory
Hi folks, I hope this is the right place to post this but you tile guys would know the most. I have a company who does garage epoxy coatings that has started putting their product on deck surfaces for covered decks and tasked me, if I so choose, with figuring out an ideal subsurface. Their current method which seams to be failing them is double 3/4 t&g ply (PT bottom, spruce top) with a thick crack isolation membrane and then the coating on top. They are having issues with crack heaving. So here is what my thought was: Would 3/4 PT ply with a 1/2 CNY treated with mesh and thinset be a better idea? My thoughts were because they have great success with garage floors this may lend better results. Thoughts?
Category: Tile Post By: SANDRA MOORE (Naperville, IL), 03/14/2019

1 1/8 ply, not T&G, with a 1/8 expansion gap. Careful attention to flashing around the edges. Seam tape or mesh all over. New top coat every 3 or 4 years, for a lightly used residential deck. Just because a coating works on a garage floor doesn't mean it will work well on a wood deck. I think most of these are urethanes or vinyls - more flexible and UV resistant than epoxy.

- FREDERICK LYNCH (Harrisburg, PA), 05/08/2019

I don't know of anything that bonds permanently to a plywood exterior. Usually it's moisture issues or thermal movement. Either they are removed or reapplied as in worn away. Not something I'd be interested in putting a warranty on.

- TARA LOWE (Bell Gardens, CA), 05/17/2019

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