Im putting down 9/16″ bamboo vertical grain flooring. I want to glue it down with Urethane wood flooring adhesive(Roberts 1408). The problem is my subfloor is 1 1/8″ plywood over 4x4s 4’O.C. and in an 8′ span the subfloor is out 3/4″. I have the henry’s 547 patch mix which can be used up to 1″. My co-worker tells me that i purchased the wrong floor leveler and that we should just shoot it down over tar paper. Any suggestions?
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First, are you saying the floor is
(A) not level overall by 3/4" but on a flat plane
or
(B) that is sags between various spots by 3/4" while the perimeter is level all around
or
something else.
4x4 @ 48" OC is not adequate framing typically and I would expect it to be sagging.
I would also expect it to keep right on sagging more as time goes on and more load is added
And I doubt that the underlayment you have is intended to be used at 48" OC, so it will probably be sagging too.
So if I understand you correctly, this whole floor syustem is underdesigned and in a state of failure, so it will not make any difference what product you use unless you fix what is already wrong instead of covering it up.
I don't mean to sound unkind.
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Sry about that it is actually 4x6 48"o.c., which im sure is still inadequate. The floor is out of lvl 3/4" but is in the same plane the allowable amount. So it sounds like adding another layer of underlayment would only compound the problem, do you think that blocking perpendicular to the joist's 16"o.c. might fix the problem?
Edited 1/12/2008 3:36 pm ET by Dagould2000
adding perpendicular to these joists will add to the load on them. Adding the same parallel to them to reduce the layout to 24" instead of 48" will do a lot of good, but need to know the length of the joists to know how much good.
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