Renovating a ’40s home with the 1″ diagonal sub floor boards. Bathroom was chopped up at one time and had the hardwood removed, 3/4″ ply screwed to sub bringing floor to same hight as hallway. We want to put the wood back in the bath and do not want a transition between hall and bath.
My plan is to pull the old sub all the way to the joists and put new down. The question is, since I need to be at 1″ on my sub in the bath, can I use 2 layers of 1/2″ laid perpendicular to each other screwed and glued or should I go with 3/4″ and add a layer of 1/4″ luan glued and screwed?
Replies
flip
Think through the removal of the sub floor-is it run under the walls? You'll need to add a joist or a functioning blocking at that area to hold the new subfloor as well as to stiffen and / or support the areas under those walls.
If you do go with 1/2", run both layers perpendicular to the joists, but stagger the joints between the two layers.
Walls were all taken out but will be put back in (non load bearing). Had planned to ad 2xs to sides of joists and saw old boards flush. Big concern was if 1/2" even doubled up was going to be too springy. The room is 10x10 or so and had full bath, it is going to be used as a half with a wide wall for mechanicals chase.
If you're concerned, find some 1/2 inch ply..............
That has more plys.
With the joists at 16" centers and an acceptible span, should be sturdy enough.
1-1/8" ply is only about
1-1/8" ply is only about 1-1/16" so that would be my choice - very stiff.
And heavy.
I'll bet it's at least as heavy as two sheets of 1/2" ply :)
HUH?
Remove ONLY the 3/4"ply underlayment, then install 15 # felt paper and then your new hardwood.... which is what was there in the 1st place, don't waste your time, energy, and money, removing the original sub-floor, it's NOT necesssary.
Good Luck!
Geoff
Floor replaced
I replaced the floor this weekend. Used 3/4 TG engineered glued and screwed with 1/4 luan on top. Too many holes in the old boards to patch and have a stable nail base for the new floor.