I'm looking to reinforce the subfloor for a bathroom that is 31" wide by 6' long. I'm going to use porcelain tile, and the current subfloor is 3/4" OSB, joists are 2x8's with 24" OC spacing w/ 10' spans.
I plugged the info into a deflection calculator and it came back with this:
"This translates to a deflection of L / 245. Since the maximum deflection for tile is L / 360, and for natural stone is L / 720, your floor is rated for Sheet Vinyl or wood."
I snapped a few pictures underneath of the subfloor from the basement, and am not sure what the "correct" way to reinforce the subfloor is, all I know is that it needs some reinforcing. I'd love if I could just add 2x4's underneath the subfloor and between the joists, and screw the existing subfloor into the 2x4 braces, and that would provide enough support.
Ok, here are a couple pictures of what I mean. For whatever reason, the previous owner installed some 2x4's between the joists on the bottom of the joists, and the insulation (I'm guessing as sound proofing) was put there by the previous owner as well.
First picture is looking down the joists, and second is perpendicular to the joists. The bathroom runs lengthwise with the joists. The toilet and vanity will be at opposite ends of the room, and you can see the drain for the toilet in the labeled picture. I'm hoping that if I install some 2x4's underneath the subfloor perpendicular to the joists the subfloor will be reinforced enough. I was thinking that perhaps if the subfloor needs more support/braces need to be stronger, I could put a 2x4 flat against the top and bottom of the joist, and then connect them with 2x4's in a couple spots like an I shape? Unfortunately I can't put 2x4's or 2x6's vertically (which would provide more support) because the plumbing is in the way.
The other question is whether I would need to add a layer of plywood to the existing 3/4" OSB. Thanks!
I plugged the info into a deflection calculator and it came back with this:
"This translates to a deflection of L / 245. Since the maximum deflection for tile is L / 360, and for natural stone is L / 720, your floor is rated for Sheet Vinyl or wood."
I snapped a few pictures underneath of the subfloor from the basement, and am not sure what the "correct" way to reinforce the subfloor is, all I know is that it needs some reinforcing. I'd love if I could just add 2x4's underneath the subfloor and between the joists, and screw the existing subfloor into the 2x4 braces, and that would provide enough support.
Ok, here are a couple pictures of what I mean. For whatever reason, the previous owner installed some 2x4's between the joists on the bottom of the joists, and the insulation (I'm guessing as sound proofing) was put there by the previous owner as well.
First picture is looking down the joists, and second is perpendicular to the joists. The bathroom runs lengthwise with the joists. The toilet and vanity will be at opposite ends of the room, and you can see the drain for the toilet in the labeled picture. I'm hoping that if I install some 2x4's underneath the subfloor perpendicular to the joists the subfloor will be reinforced enough. I was thinking that perhaps if the subfloor needs more support/braces need to be stronger, I could put a 2x4 flat against the top and bottom of the joist, and then connect them with 2x4's in a couple spots like an I shape? Unfortunately I can't put 2x4's or 2x6's vertically (which would provide more support) because the plumbing is in the way.
The other question is whether I would need to add a layer of plywood to the existing 3/4" OSB. Thanks!