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Installing ditra over an approved substrate is much, much easier.
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- I have had 2 failed showers in the bathroom. Ok now you are saying no it is not but it is.
- My house was built with particle board floors through out.
- I am buying, what I think is a decent quality tile at. My house is almost 20 years and sits on a crawlspace.
- I will be installing 12 x 24 porcelain tile in my kitchen.
- Patching and Finishing Compound SF10, quick drying a perfect choice for skim coating projects at The Home Depot.
- Find the Custom Building Products SpeedFinish 10 lb.
- So many things to learn/be taught.The only way you could get the height of the tiled floor to be the same as the finished hardwood floors would be to remove the vinyl, particle board and 1/2' subfloor. Are you working with craft paper? Or did you plan to go straight over the plywood? Have you checked your HVAC system to ensure it can handle the humidity requirements of your new hardwood? Do you have the ability to adjust humidity up and down or to 'balance' it around 45% (ideal = 45%-65%.but MANY hardwood floors have their own requirements.and you must STICK TO THEM or you lose warranty)? So many things that need to be dealt with before you lay down the hardwood. Again, this depends on whether this is a glue down or a nail/cleat/staple in place. You will also want to look at what you are putting in between the plywood and the hardwood. You do not mention if it is engineered or solid.
You do not mention how you plan on installing the 3/4' hardwood. You have to 'miss' the joists.so it is best to figure out how to document (a chalk marke on the wall where the joists are centred will work) where they are. You do NOT screw the second layer to the joists. There is no glue between the two layers of subfloor.just screws. You will be screwing the plywood into place as per National Wood Flooring Association Guidelines (you can purchase the down load for $$$.or see if someone will send you the spes for 'subfloor' building). It will 'work' with cleats and screws.but not as well as plywood. OSB does not like glue, nor nails, nor staples.
Carpet is allowed a lot of underneath it.so don't go on what was there. The 2nd layer is there for 2 reasons: rigidity for the hardwood and something for your glue/nails/cleats/staples to grab on to. Good side plywood is your 'go to' product for hardwood.and many, many other floors. You cannot go over the 1/2' substrate (the thing sitting on your joists). You need SOMETHING for the second layer (called 'underlay' for a reason). The 'good' professionals won't go anywhere NEAR OSB under hardwood. OSB is not a 'good' subfloor material for hardwood.