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-   -   Bouncy joists (http://www.houserepairtalk.com/f13/bouncy-joists-13753/)

cmerk16 04-08-2012 09:50 PM

Bouncy joists
 
Is it necessary when trying to eliminate bouncy Joists to use 3/4 inch plywood or can I use half-inch?

Reason I ask is because I have a bunch of half inch sheets left over and was thinking about just using that since I had it. And then by 3/4 for where I need more.

Or just double up on the half-inch on both sides of the joists and buy 3/4 when I run out?

isola96 04-09-2012 05:41 AM

Quote:

Originally Posted by cmerk16
Is it necessary when trying to eliminate bouncy Joists to use 3/4 inch plywood or can I use half-inch?

Reason I ask is because I have a bunch of half inch sheets left over and was thinking about just using that since I had it. And then by 3/4 for where I need more.

Or just double up on the half-inch on both sides of the joists and buy 3/4 when I run out?

What is going over the floor? All subfloors in my book should be at "least" 3/4" for anything other then tile 1" of wood. But if this is cost to you double up on the 1/2" you won't have any bounce, just make shore your not to high from other rooms by doing this.

nealtw 04-09-2012 10:09 AM

I would think the half inch plywood wood help. Have you measured the bend that you are getting now? If you run a tight string from wall to wall an inch above the floor you can measure how much it moves when you walk on it. Do up a few joists and see how well that is working.
On another thread Bridgeman suggested a 2x4 on flat glued and screwed to the bottom of the joist and he had all the numbers on how much stronger the joist would be.

Jaz 04-11-2012 11:03 AM

Just to clarify for isola96, (aka Jet) the OP is talking about using ply strips to sister the joists, not as a subfloor.

Jaz

isola96 04-11-2012 05:46 PM

Quote:

Originally Posted by Jaz
Just to clarify for isola96, (aka Jet) the OP is talking about using ply strips to sister the joists, not as a subfloor.

Jaz

tushay!..... Jaz, another check mate on me.

I personally don't think that will remedy much since there strips now 2x4s better and cat them even "betterer"! Lol

00Mike 04-11-2012 06:10 PM

"Is it necessary when trying to eliminate bouncy Joists to use 3/4 inch plywood or can I use half-inch?"

Was the structure built to code? If so, there shouldn't be a bounce. I just built a two story 2.5 car garage using my own design. Prior to building I researched on line for building codes regarding joist spans for live loads. I found that, to meet code for my situation, I had to use 2x10x12s - 16"o/c - supported by 4 glued up 2x12x16s - which were themselves supported by 2 jack posts equally spaced down the length of the garage. There was no bounce prior to installing the 1/2" plywood and it's solid as a rock. The alternative was to use 14" high laminated I beams which was unacceptable.

If you're not concerned about walking on the deck you don't need to be as critical but I don't think that plywood, by itself, will give you the results you're looking for. Plywood may greatly reduce the amount of bounce but, if the framework was under-built, it may not be a satisfactory solution.

nealtw 04-11-2012 06:49 PM

OOMIKE; Was there a suggestion in there , or should he just rip it down and start over?

isola96 04-11-2012 07:52 PM

Well I don't think it's the joists.
We're any parts of the floor sagging?
Your going to have bounce if you put 1/2" ply down plain and simple.

nealtw 04-11-2012 09:58 PM

isola. He is talking about beefing up the joists not putting down 1/2"

isola96 04-12-2012 04:26 AM

Quote:

Originally Posted by nealtw
isola. He is talking about beefing up the joists not putting down 1/2"

Yes Opps?!... Post withdrawn


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