So Funny Chelone!! be sure and have on an LBD and heels during that little talk.

I cant belive that fiberglass/plywood held up that long,belive me if I could come up with something like that It would be in test mode PDQ.

The way we do it>>>plywood over the joists,torch down modified roof, PT stringers laying flat on the roof,decking screwed down to the stringers.Its very possible to do a reto fit using this system but of course it depends on several unknowns with Your project.

John Mon

The glue in marine plywood is not waterproof at all. The differance in marine plywood is clear lams,that is there are no knots in the plys. It built for sheer strength,laying out in the weather with out protection it will react the same way cdx or any anyother plywood will. J.

Thanks for your suggestions, guys. I was rather hoping to avoid the necessity of fibreglassing again. The reason being, it is invariably done later in the season when the temperature is dicey for a good cure. And that's because the helpmeet manages to put it off until the "window of opportunity" is about 3/4 shut. You can appreciate my angst, I'm sure.

To get him to rip up the existing plywood, replace it, and fibreglass would probably require something considerably more provocative than a LBD... more on the order of fishnets and stilettos, methinks. And I'd have to wear that get-up while helping him rip off the existing deck. ;)

But at least I have some good information from which to work. Thanks again. :)

Johnchelone,its not possible to install the torch down over fiberglass but it might be possible to install new plywood over the existing. I am thinking the existing already has some fall to it,and of course all needed flashing would have to be placed but it sounds completley possible.

John

I have used a system using multiple coats of liquid polyurethane. Joints are taped using a special fiber tape embedded in polyurethane caulk, corners are flashed with
metal and tape and caulk. It can be a simple waterproof surface or sand and a color coat can be used to provide a walking surface. I have done many decks without a failure. Skills needed are moderate, but attention to detail is a must. I get from a local supplier without a website. Universal Protective Coating in San Rafael CA. Deck 70.

I've never seen the product myself but came across it in researching my own deck project.

Any of the pros here have any experience with a product like TimberTech DrySpace?

Here is a link that might be useful: TimberTech DrySpace.

what's an LBD?

Soooooooo Funny!!!! some people follow a very simple path.

LBD= Little...Black...Dress. Combined with CFMs a girl can get a lot of things done. J.

Chelone,

I tripped in here via a web search for Tigerwood (can't believe people build decks out of Tigerwood- wonder what they look like!) anyhow, I digress...

I haven't read any other posts in this forum, so not sure why Duradek wasn't brought up as an option for you. WE had it installed on our previous deck- no problems for over 10 years. We also ripped out an old fibreglass/covered plywood deck and had duradek installed in this house- oh probably 10 years ago- zero problems, no leaks, though color in pattern has been scrubbed off in high traffic areas- still looks pretty good though!

We have the same situation, garage under deck, so waterproofing a high priority!

Here is a link that might be useful: Duradek vinyl

Miraflex is the bomb!!!! We have it, love it and our favorite spot in our whole place is the sun/spa room underneath it.

Here is a link that might be useful: Miraflex

I used to build houses and used a product called Spandex when a waterproof application was required. Exterior grade plywood (you could use pressure treated, but not required), joints are sealed, perimeter prepped. Rolls on, and it is a colored, rubberized, textured surface. Don't forget to confirm the slope of the deck.

We extended our deck to go over existing living space, replacing existing roof. It had to meet codes and be a reliable roof. We accomplished it by sheeting the deck with OSB plywood and installing a rubberized roofing membrane material over the plywood. Sleepers were wrapped with the membrane material and then glued to the membrane. A deck then can then be mechanically fastened to the sleepers. The decking material must be suitable for the conditions, one of which is limited ventilation.

There are several roofing materials, membranes on the market up to the task.

@zinnah Hi Zinnah, I am considering Deck 70 for my rooftop deck, wanted to check with you if you still recommend it after all these years?