Hi , we are tearing up all the plywood on our 900 square foot deck and replacing it all, but we are not sure what we should use for the flooring part of it
its not a covered deck . Should we use vinyl or that roll on stuff? If anyone knows anything about this could you please give me some ideas . thank you

It's not clear how your deck is constructed. Did it previously have a plywood floor? Usually a deck floor is made up of boards with small spaces between them. You can use pressure-treated wood (not very pretty), cedar, any of several hardwoods like teak or Ipe´, or composite decking made of part plastic and part wood fiber.

If you still want a solid floor, consider fiberglass or thick multi-layer vinyl, both of which function as roof and deck, but both of which also are normally installed by manufacturer approved installers.

Yes we put all new tongue and groove plywood on our deck, but just not sure what to use for the flooing part of it.Could we use the roll on stuff? Thank you , Kim Durkee

I have no clue as to what you mean by "roll-on stuff". If you're talking about sheet vinyl flooring, it's best to check with the dealer or the manufacturer. I don't believe the product is intended to withstand weather. That's why I suggested the products I did. There are very few products of that nature that are intended to be exposed to the weather.

How do you plan to seal the t&g plywood from the elements? You still have to plan for sideways rain, as well as surface tension drawing water up from the edges even if the entire top surface is sealed with some type of impervious layer. Also, is there a notable slope to the deck? In AZ, there are lots of flat roofs where hot tar is mopped on the plywood roof, but because of inadequate slope, the rain puddles and eventually the roof gets damaged. So no matter what you use to cover the plywood, if the water can't drain off the surface sufficiently, damage can occur, meaning you will have to rip it all up again in the future.
I imagine your deck as a solid-surface sructure with a no-slip top surface like artificial turf or the like. If that is the case, AND the slope is sufficient, then "Wind & Water Seal" is what I used instead of tar paper for my roof. Its a peel-&-stick roofing material made of rubber & asphalt with an adhesive bottom and plastic top coat that just rolls out to form a continuous waterproof surface. All it needs is UV protection (like artificial turf). Be forewarned though, that this is not the usual use for the stuff, so I wouldn't count on a warranty - but then, if its not protecting the interior of a home, maybe thats not so important.

Thanks for your help but I'm not sure if you know what I'm talking about ,where we live they have a 3 step roll on thick deck paint made for covering a deck.But thank you so much any way.. Kim Durkee

I have my doubts about the longevity of a solid plywood deck, and I also have doubts about the ability of any paint to protect the plywood.

Deck paints and stains will not keep all water out. They are made to be applied to wood decks which should have space between the planks of wood for breathing, drying and water drainage. I see this as a solid layer of plywood and therefore wouldn't count on any deck paint or stain to seal it. Also if the water cannot easily drain away then it will puddle and eventually work its way through the paint/stain. What happens then is that the wood gets wet, never dries, rots and your paint/stain bubbles. I have seen it happen in decks where people caulk between the planks.
Maybe you should look at the waterproofing techniques that have been mentioned earlier in the post.

Best of luck!