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Old 04-08-2012, 09:50 PM  
cmerk16
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Default 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?



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Old 04-09-2012, 05:41 AM  
isola96
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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.


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Old 04-09-2012, 10:09 AM  
nealtw
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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.

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Old 04-11-2012, 11:03 AM  
Jaz
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Just to clarify for isola96, (aka Jet) the OP is talking about using ply strips to sister the joists, not as a subfloor.

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Old 04-11-2012, 05:46 PM  
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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
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Old 04-11-2012, 06:10 PM  
00Mike
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"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.

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Old 04-11-2012, 06:49 PM  
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OOMIKE; Was there a suggestion in there , or should he just rip it down and start over?

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Old 04-11-2012, 07:52 PM  
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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.

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Old 04-11-2012, 09:58 PM  
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isola. He is talking about beefing up the joists not putting down 1/2"

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Old 04-12-2012, 04:26 AM  
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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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