Welcome to the DoItYourself Forums!

To post questions, help other DIYers and reduce advertising (like the one on your left), join our DIY community. It's free!

Filler for too large of gap between pieces of plywood underlayment?


burrmanchu's Avatar
Member

Join Date: Nov 2016
Posts: 83
IL

12-27-16, 12:58 AM   #1  
Filler for too large of gap between pieces of plywood underlayment?

Hey all..

Installed some 5/8" plywood over old plank subfloor. Obeyed the 1/8" gap rule. Had some unexpected drying shrinkage but nothing too bad. In my hall however, there is one gap that opened up to 1/4" or more smack dab in the middle of the hallway (running across). I plan on putting carpet in there, so what should I use to fill that gap? I trolled around but never found a real answer. Someone said floor leveling compound, and immediately someone else said it's too brittle and will crumble over time. Someone else said just caulk it, but wouldn't that still allow a little divot to form across the hall in the carpet over time? I'm tempted to just cut a 1/4" shim of plywood to stick in there, but figured I'd ask you guys first and see what a 'pro' might do in this situation. Also it would be nice to know proper procedure for this type of thing if it happens in different areas down the line. I really, really do not want to unscrew a whole piece, re-lay the felt, and set another one if something else can be done. (and if there is a good answer, please let me know if it would work for both under carpet and under hardwood... for future reference)

Thanks guys!

Brian

 
Sponsored Links
Marq1's Avatar
Member

Join Date: Sep 2016
Posts: 1,929
MI

12-27-16, 01:20 AM   #2  
YOu mention that it is screwed down, cant you just undo the screws, bump it over and be done?

Carpet and pad? if heavy stuff might not even have an issue!

 
Norm201's Avatar
Member

Join Date: Sep 2013
Posts: 5,430
NY

12-27-16, 04:01 AM   #3  
It's been a long time since I've used floor leveler, but I've never known it to crumble. It's meant for floors.

 
burrmanchu's Avatar
Member

Join Date: Nov 2016
Posts: 83
IL

12-27-16, 12:39 PM   #4  
@marq1

The piece is cut for several corners around the bottom of a closet, a corner, and the top of the stairs There's no way I can just bump it over, I'd have to cut a new one and re-screw in an already over-screwed (lol) area. It's really solid and squeak free, so I'd like to keep it if at all possible.

@Norm201
I figured as much... but since there is supposed to be a 1/8" gap there anyway, how do I go about using a compound like a floor-leveler in that gap? Wouldn't filling the gap entirely defeat the purpose of the expansion gap to begin with?

I was hoping there was a solution strong enough to not show the gap through the carpet, yet flexible enough to move with the plywood when it expands/contracts... Am I way off base?

 
Norm201's Avatar
Member

Join Date: Sep 2013
Posts: 5,430
NY

12-27-16, 01:52 PM   #5  
If the edges are still with the 1/8 gap, I don't think the fill-in job in the middle will affect the floor. It should expand contract in at the edges. And only if temperature and moisture fluctuate to an appreciable amount. I don't think you need to worry about it. Others may not agree.

 
Marq1's Avatar
Member

Join Date: Sep 2016
Posts: 1,929
MI

12-27-16, 07:12 PM   #6  
Then rip a 3" wide piece of plywood and cut our a 2 3/4" wide strip off the floor and call it done!

 
XSleeper's Avatar
Group Moderator

Join Date: Dec 2004
Posts: 19,318
NE

12-27-16, 08:08 PM   #7  
Fill the gap with subfloor adhesive and forget it. You are splitting hairs.

 
burrmanchu's Avatar
Member

Join Date: Nov 2016
Posts: 83
IL

01-03-17, 09:31 AM   #8  
Thanks for the replies guys... and @xsleeper.. isn't this entire forum for splitting hairs? lol

 
Search this Thread