Weak spots in floor?

Repair help for the do-it-yourselfer.
For mobile home parts, click here.

Moderators: ponch37300, Mark, flcruising, Greg, DCDiva, JD

Weak spots in floor?

Postby mrstovar » Tue Oct 23, 2012 12:04 pm

Our mobile home has very weak spots in the floor, right inside the door and under some windows. Do we cut out the weak particle board spots and replace it with plywood; tear out all the particle board and start over; or do we put the plywood over top the whole floor, weak spots and all? We want to finish it with linoleom on top if we can afford it, or a good layer of paint if we can't.
mrstovar
 
Posts: 33
Joined: Sun Apr 01, 2012 5:21 am
Location: central PA

Re: Weak spots in floor?

Postby Greg » Tue Oct 23, 2012 2:29 pm

You can either do a patch job And replace it with either Plywood or OSB. DO NOT use particle board or MDF. You can replace all of the sub floor if you want, but if it is only a few areas I would cut & patch.

I do not recommend going over the top. The problem is that when the rest of the old subfloor falls apart you are left with nothing holding up the new floor.

Greg
"If I can't fix it, I can screw it up so bad no one else can either."
User avatar
Greg
Moderator
 
Posts: 4643
Joined: Wed Feb 28, 2007 8:01 pm
Location: Weedsport, NY

Re: Weak spots in floor?

Postby bobfather99 » Tue Oct 23, 2012 10:19 pm

If youre on a budget, you can cut out and replace what's damaged. Cut a little bit extra out beyond what's "soft" or water stained to be sure you get to something solid. Use the same thickness of material to patch it in. Be careful not to set your saw too deep when cutting, you might cut a wire or pipe underneath the floor. Id recommend adding some 2X4 blocking underneath your repair and use plenty of good quality screws for strength. Countersink the screws or get them flush to the floor so they wont pop up if you lay down vinyl.
Tip your bartender.....
bobfather99
 
Posts: 187
Joined: Fri Nov 13, 2009 2:09 am
Location: Indiana

Re: Weak spots in floor?

Postby mrstovar » Wed Oct 24, 2012 6:59 am

Thanks for the information!
mrstovar
 
Posts: 33
Joined: Sun Apr 01, 2012 5:21 am
Location: central PA

Re: Weak spots in floor?

Postby JD » Wed Oct 24, 2012 11:44 am

With my repairs, I always try to start and end the repair right down the center of a joist, so the new wood and existing wood has something to be nailed own to. When that is not possible, up against a wall for instance, then I have to frame in blocking to be that joist. The cuts going the other way will be spanning joists. There must be blocking under this cut. When fastening in the new wood, remember to re-nail/screw the edge of the existng subfloor to attach it to the joists and blocking as well. Nail pattern is 4"oc around the perimeter and 6"-8" in the field. I use PL adhesive with the screws to ensure no squeaks.

I would go with 3/4" plywood for the repair. 5/8" plywood is a nominal thickness. Actual thickness is 19/32". While this is closer to the thickness of 5/8" particle board, which actually is 5/8" thick, the 19/32" is a bit soft and spongy (I do believe 19/32" is legal with 16" oc joists though). Going to 3/4" (23/32" actual), you should end up with a lip on the edge of the repair because of the thicker plywood. This edge is reduced by floating out the difference with floor compound, to the point where the change is unnoticeable.
☯JD♫
Today is PERFECT!

All information and advice given is for entertainment and informational purposes only. The person doing the work is solely responsible to insure that their work complies with their local building code and OSHA safety regulations.
User avatar
JD
Site Admin
 
Posts: 2597
Joined: Sun Feb 25, 2007 11:57 pm
Location: Fresno, CA

Re: Weak spots in floor?

Postby dpodeskmail12 » Sun Nov 11, 2012 10:19 am

Hello,

We recently had this same problem. Our issue was there were leaks in the roof that were moving down the inside walls to the floors in some spots.

First, we had to find all of the bad floor spots, we then used a circular saw and cut out the bad particle board (this stuff sucks) and cleaned up the areas around the floor trusses.

We then cut 3/4" plywood to fit and used drywall screws to put them in place.

This has been a quick and easy fix and it holds up very good!

Hope this helps.
Join In Our Journey As We Redo & Fix Up Our New Mobile Home:
http://www.TheMobileHomeProject.com
User avatar
dpodeskmail12
 
Posts: 1
Joined: Sun Nov 11, 2012 9:56 am
Location: Palm Springs FL

Re: Weak spots in floor?

Postby JD » Sun Nov 11, 2012 7:26 pm

There must be blocking under the cuts between joists. If not, the plywood will be spongy and the existing particle board will break, unless it is a spot no one will ever step on.
☯JD♫
Today is PERFECT!

All information and advice given is for entertainment and informational purposes only. The person doing the work is solely responsible to insure that their work complies with their local building code and OSHA safety regulations.
User avatar
JD
Site Admin
 
Posts: 2597
Joined: Sun Feb 25, 2007 11:57 pm
Location: Fresno, CA

Re: Weak spots in floor?

Postby chablis » Fri Dec 28, 2012 1:07 am

When we redid the bathroom floor (after an undetected shower pan leak which resulted in the particleboard disintegrating,) we ripped out as much of the rotten particleboard, used a sawzall to get as close to the walls as possible. Then we sistered in 2 x 6 joists across the floor to the existing joists, even though the existing ones looked solid and dry. We figured that with all the work we had done so far, it couldn't hurt. After that we applied 5/8 inch marine grade plywood over the floor. There wasn't enough non rotten particle board to make any of it worth saving, so we did a total re-floor. I'd suggest once you identify all the soft spots in any particular room, stripping off the floor covering to see how much farther there is water damage, and then calculate out how much plywood you'll need.

BTW--sistering the joists added about $120 to the cost of the project, which we considered acceptable, given the amount of work we were already stuck with doing.
Chablis
chablis
 
Posts: 33
Joined: Mon Sep 22, 2008 2:35 pm
Location: New York State

Re: Weak spots in floor?

Postby MizFurball » Thu Jan 10, 2013 11:56 pm

Mark's book shows exactly how to replace flooring.
User avatar
MizFurball
 
Posts: 36
Joined: Thu Nov 15, 2012 4:36 pm


Return to Mobile Home Repair

Who is online

Users browsing this forum: No registered users and 3 guests