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MauriceS
Subfloor repair question

Hello,

We have a problem with a subfloor in a bathroom. The builder tiled the bathroom, but did NOT use backerboard, and we had a leaky toilet which made the subfloor moldy and it bulked up.

The toilet is next to the bathtub. The damage is till close of the bathtub. The toilet is located between 2 I joists, and there is a third I joist under the tub. We need to remove a part of floor and cut between the toilet and tub... But we don't want to lift the tub out really... Does sistering give enough support for the piece of flooring?

Kind regards,

Maurice

Re: Subfloor repair question

Hello, Absolutely! This is the only way sometimes. Sandwich joists as needed and nail the heck out of them! This is more than enough!You can also head it off in and around areas if needed. Hope you understand.;)GregC

MauriceS
Re: Subfloor repair question

The house was a foreclosure (in really good shape really) but they used frost protection liquid to make the pipes not freeze - but I suspect that affected the wax seal... ;-(
Then on top of that, the builder tiled on plywood ;-( instead of backer board, or any other more suitable substrate.

Gizmo
Re: Subfloor repair question

jkirk, did something in the industry chance with durock, its always been used on floors from what Ive seen.

Yrs ago the first concrete board I remember was Wonder Board. Ceramic tile on 3/4 ply with the joist 16" oc would crack. Then the engeneers decided go to 12"oc. That didnt work either so Wonder Board was the answer...

http://www.usg.com/USG_Marketing_Content/usg.com/web_files/Documents/Installation_and_Appl_Guides/DrckCement_Board-Installation_Guide.pdf

canuk
Re: Subfloor repair question

Gizmo --- from my recolection backer boards were to replace the old mortar and mesh system.
Tile over plywood can be a suitable system considering the modified mortars and additives available.

Floor structures --- unless spec'd --- are rarely suitable for tile without some modification.
With 12 inch centers joists are typical for tile spec'd floors and 16 inch centers can be used depending on span.

Besides i believe uncoupling membranes are a good idea for a substrate.

Gizmo
Re: Subfloor repair question

I remember the mesh morter they used for tile. Man those installer's got old pretty quick. Most of them couldnt walk very well when they hit 40 yrs old....

canuk
Re: Subfloor repair question

You got that right ;)

A. Spruce
Re: Subfloor repair question

Any flooring installer doesn't move too well after a few years. Heck, I don't move too well after only a few hours of knee work.

canuk
Re: Subfloor repair question

Ditto --- plywood subfloor and uncoupling membrane works perfectly fine.

canuk
Re: Subfloor repair question

These tired old bones feel it the next morning ----- hockey and football did a number on my pins.

JLMCDANIEL
Re: Subfloor repair question

Oh, stop you complaining. Wait till you get to my age. You just kneel down to pick up a hammer and they have to call the rescue squad to get you back up.:eek:

Jack

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