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Unread 04-25-2010, 09:33 PM   #1
brian73
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What is the best method to level wood subfloor?

Starting my next bath... Everything removed, ready for second layer of plywood, put level down, floor out by about 1/2" over 4'. These are not dips, but the entire floor slants to one side. What are my options for leveling wood subfloor when its that far out. Pulling out the old floor is really not an option. As far as i can tell the walls are built on top the t&g floor. I will be placing another layer of 3/8" plywood once its leveled, then ditra... What are my options?

Any help would be much appreciated, I need this bath done ASAP.
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Unread 04-25-2010, 09:38 PM   #2
Brian in San Diego
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If you are adding the 3/8" to further strengthen the subfloor then you could do a layer of SLC to get the floor flat and level after you put the plywood down.

Incidentally walls are almost (if not always) built over subfloor. Removing the subfloor making repairs and putting don new subfloor isn't all that uncommon.
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Unread 04-25-2010, 09:50 PM   #3
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Thanks Brian,

The issue i had with SLC is having to use the wire mesh... so assume that will raise the floor about 1/4 inch in the highest areas? hmm... So if I was to pull up the entire floor, what is the best way to repair the joists? It is built with i-beam joists. Also, how would I go about reattaching the floor to the walls?

This was suppose to be a quick project and looking to be a nightmare... I figured it would be out a little, guess I should have checked it out sooner.
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Unread 04-25-2010, 10:26 PM   #4
Brian in San Diego
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If you remove the subfloor there should be no repairing of the joists necessary. You don't cut into them. You will have to figure a way to support all the panel edges of your new subfloor, however. Do you have dimensional lumber joists? Did you check the Deflecto to see if you are O.K. to install tile? Yes, SLC has a minimum thickness when installed over plywood. Do you know how thick the plywood subfloor that is currently there is?
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Unread 04-25-2010, 11:15 PM   #5
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Joists are I-beam, on 16" centers. Ibeams are approximately 12+" tall, with a very short span, maybe 8'
Plywood subfloor is 3/4".


Thinking SLC is gonna be the way to go... Its an odd shaped bath and only about 5x7'. SLC should be able to do in a couple hours, pull floor and level sounds like it would take a day or 2. I need the practice with SLC anyway...

I was hoping I could get away with leveling with fix-all compound, then sandwich between the 2 layers of plywood... or something like that... but probably should just do it right.
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Unread 04-26-2010, 05:24 AM   #6
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Brian, a 1/8" per foot slope is not all that bad. The tile won't mind it if you don't.
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