DIY Home Improvement Forum banner
1 - 20 of 33 Posts

· Tileguy
Joined
·
6,054 Posts
Lyle,

I agree it looks like sheet vinyl adhesive residue. But normally vinyl is installed over a 1/4" underlayment, is that what you've got? What are your plans for a new floor?

Huh? a floor register in a bathroom, wonder why they allow that?:eek:

Jaz
 

· Registered
Joined
·
21 Posts
Discussion Starter · #6 ·
Lyle,

I agree it looks like sheet vinyl adhesive residue. But normally vinyl is installed over a 1/4" underlayment, is that what you've got? What are your plans for a new floor?

Huh? a floor register in a bathroom, wonder why they allow that?:eek:

Jaz
Jaz, what you're seeing is plywood at it's finest..... My plan for the floor is either 18 x 18 or 12 x 12 glazed porcelain. with ditra of course.:thumbsup:. As far as the floor register goes I guess I'll just live with it.....
 

· Tileguy
Joined
·
6,054 Posts
Yes, it's plywood alright. So there's no other layer under this one? Vinyl should never be glued to the subfloor. They used to use -1/4" luaun a lot which is also plywood.

So, if that's the subfloor, is it in good shape? Next, let's start with the framing specs to be sure you're ok for tiles. Need; the size, species & grade of the joists, spacing, and the longest unsupported span. The thickness and number of layers of the subfloor. Might help to know the age and location too.

Don't worry about the floor register, they do that in several states. It's not an issue unless something overflows.:eek:

Jaz
 

· Registered
Joined
·
21 Posts
Discussion Starter · #8 ·
Nope just plywood...The house was built in 1984 and I'm in Knoxville Tennessee.. And I hate to ask but how do I find out the framing specs? Would a tile installer know this by looking at the floor? Oh and the sub floor feels real solid all over. And if it helps the room is 5 x 8....
 

· Registered
Joined
·
1,311 Posts
Nope just plywood...The house was built in 1984 and I'm in Knoxville Tennessee.. And I hate to ask but how do I find out the framing specs? Would a tile installer know this by looking at the floor? Oh and the sub floor feels real solid all over. And if it helps the room is 5 x 8....
Scrape the sub floor clean then put down some luanun 1/4 inch then you have a good floor to work on. you should be just fine putting tile down.
One more thing you need a new WC flange in there.
 

· Tileguy
Joined
·
6,054 Posts
:thumbsup:
Scrape the sub floor clean then put down some luanun 1/4 inch then you have a good floor to work on.
ABSOLUTELY NOT! Don't do that. 1/4" ply of any type and especially luaun is never used in a ceramic tile installation. Not even if they're not on top but in the 'sandwich'.

The data sheet from the thinset manufacturers' say something like this;

CustomBuildingProducts said:
Limitations to the Product
Do not bond directly to hardwood, Luan plywood, particle board, parquet, cushion or sponge-back vinyl flooring, metal, fiberglass, plastic or OSB panels.
Lyle, I asked;
The thickness and number of layers of the subfloor.
If there were two layers of ply it would still be 'just plywood'.

You determine how the floor is framed by going under the floor and looking up, take a measuring tape.

Lyle said:
Oh and the sub floor feels real solid all over. And if it helps the room is 5 x 8....
I can't define what 'real solid' means. The size of the room doesn't matter.

Jaz

Took a short break and found 12penny's post. Good info.
 

· Tileguy
Joined
·
6,054 Posts
Measure the joists, might be 2x8 (1.5x7.25), 2x10 (1.5x9.25) or? Would be nice if we knew the species and grade. On center spacing, usually 16". The span is usually from the face of the outside supporting wall/foundation, to the face of the center beam. Need to measure accurately to the inch. Try to find any stampings and read what it says. A camera might help.

Hopefully spiders are dormant, but maybe not. :eek:

Jaz
 

· Not so new
Joined
·
970 Posts
In your picture I can see nails in the plywood. They go into the
floor joists. I also see they are on 16" centers. What we need to
know is what the joists are resting on. One end should be on an
outside wall.... the other end is probably on a load bearing wall on
the first floor. You need to measure between the two.
 

· Tileguy
Joined
·
6,054 Posts
Since your house was built in '84, the framing should be ok. But, it's still a good idea to double check. So you can measure the joist spacing as 12 penny said. The span should be from an outside wall to a center beam. You should be able to figure where the center beam is. Then measure that.

The other factor is the size of the joists. If the space under this room has a finished ceiling, no problem. Drill a small hole in the subfloor. Stick a stiff object into the hole to measure the distance to the drywall ceiling below. Stiff wire or a rod or dowel works, fine. Mark the distance and allow for the thickness of the subfloor. That measurement will probably be 7.25" or 9.25 for 2x8 or 2x10 joists.

Report back with the 3 details.

Ah....you forgot the room is on the 2nd floor..... Please stop drinking your lunch!:laughing:

Jaz
 

· Newbie Bill
Joined
·
1,107 Posts
Floor registers are in every bathroom I've seen around here. But then again, I'm in Canada where we need a little heat in the john.

The OP can use the register hole to see how thick the plywood is and he can likely slide a ruler between the vent duct and the plywood to measure the depth of the floor cavity.
 
1 - 20 of 33 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top