DIY Home Improvement, Remodeling & Repair Forum > DIY Home Improvement > Flooring > Bouncy joists




Reply
 
Thread Tools Search this Thread Display Modes
Old 04-08-2012, 09:50 PM  
cmerk16
Junior Member
Join Date: Mar 2012
Posts: 10
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?


cmerk16 is offline  
 
Reply With Quote
Old 04-09-2012, 05:41 AM  
isola96
Senior Member
 
isola96's Avatar
Join Date: Oct 2011
Location: Lagrangeville, New York
Posts: 437
Liked 7 Times on 7 Posts

Default

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.


isola96 is offline  
 
Reply With Quote
Old 04-09-2012, 10:09 AM  
nealtw
Contractor
Join Date: Nov 2010
Location: Upper Fraser Valley, British Columbia
Posts: 13,811
Liked 1399 Times on 1233 Posts
Likes Given: 2410

Default

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.
nealtw is online now  
 
Reply With Quote
Old 04-11-2012, 11:03 AM  
Jaz
Ceramic Tile Pro
 
Jaz's Avatar
Join Date: Mar 2006
Location: Troy, Michigan
Posts: 84
Liked 19 Times on 14 Posts
Likes Given: 1

Default

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

Jaz
__________________
Tile 4 You LLC
Troy, Michigan


I've NEVER made a mistake....I thought I did once....but I was WRONG!
Jaz is offline  
 
Reply With Quote
Old 04-11-2012, 05:46 PM  
isola96
Senior Member
 
isola96's Avatar
Join Date: Oct 2011
Location: Lagrangeville, New York
Posts: 437
Liked 7 Times on 7 Posts

Default

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
isola96 is offline  
 
Reply With Quote
Old 04-11-2012, 06:10 PM  
00Mike
Woodworker
Join Date: Aug 2010
Location: Rochester, New York, NY
Posts: 7
Liked 1 Times on 1 Posts

Default

"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.
00Mike is offline  
 
Reply With Quote
Old 04-11-2012, 06:49 PM  
nealtw
Contractor
Join Date: Nov 2010
Location: Upper Fraser Valley, British Columbia
Posts: 13,811
Liked 1399 Times on 1233 Posts
Likes Given: 2410

Default

OOMIKE; Was there a suggestion in there , or should he just rip it down and start over?
nealtw is online now  
 
Reply With Quote
Old 04-11-2012, 07:52 PM  
isola96
Senior Member
 
isola96's Avatar
Join Date: Oct 2011
Location: Lagrangeville, New York
Posts: 437
Liked 7 Times on 7 Posts

Default

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.
isola96 is offline  
 
Reply With Quote
Old 04-11-2012, 09:58 PM  
nealtw
Contractor
Join Date: Nov 2010
Location: Upper Fraser Valley, British Columbia
Posts: 13,811
Liked 1399 Times on 1233 Posts
Likes Given: 2410

Default

isola. He is talking about beefing up the joists not putting down 1/2"
nealtw is online now  
 
Reply With Quote
Old 04-12-2012, 04:26 AM  
isola96
Senior Member
 
isola96's Avatar
Join Date: Oct 2011
Location: Lagrangeville, New York
Posts: 437
Liked 7 Times on 7 Posts

Default

Quote:
Originally Posted by nealtw
isola. He is talking about beefing up the joists not putting down 1/2"
Yes Opps?!... Post withdrawn


isola96 is offline  
 
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Similar Threads
Thread Thread Starter DIY Home Repair Forum Replies Last Post
Joists cmerk16 Walls and Ceilings 7 03-28-2012 06:22 PM
What to do about "bouncy" floor? AlexEthridge Framing and Foundation 12 11-27-2011 09:37 AM
Help with bouncy floors papakevin Framing and Foundation 33 11-14-2011 10:06 PM
help with joists britny1 Carpentry and Woodworking 2 10-14-2010 06:55 PM
4x8 joists in my woodshed camb General Home Improvement Discussion 2 09-01-2010 07:07 PM

Newest Threads

LATEST SPONSOR DEALS