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Water Damaged Subfloor On New Build

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Unread 06-24-2020, 07:05 PM   #1
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Water Damaged Subfloor On New Build


Looking for tip on how to handle a subfloor replacement.

Got a new build that has been sitting open to the elements for at least all winter and now the subfloor is damaged and needs to replaced.

Second floor is easy, small rooms to take down the framing replace the damaged subfloor and reinstall. Nothing load bearing due to the truss design.

Downstairs is the hard part. several load bearing wall, but biggest question is how to replace is under exterior walls.

Any tips or tricks on how to accomplish this?

TIA
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Unread 06-24-2020, 07:11 PM   #2
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Re: Water Damaged Subfloor On New Build


what is the sub-floor material?

does it have to be removed from under ext walls?

if the floor is that shot what about joists & rim?

check for mold?

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Unread 06-24-2020, 07:20 PM   #3
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Re: Water Damaged Subfloor On New Build


Floor material is weyerhauser Gold edge, I believe 1 1/8 thick. The floor has been exposed to the point its swelling and lifting the nails out in a couple areas. Haven't went under the house yet to inspect the joists/rim but mold is a fear.

I called the city inspector to see if they are going to want it removed from under the exterior walls, but no answer yet. (only called today)
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Unread 06-24-2020, 07:38 PM   #4
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Re: Water Damaged Subfloor On New Build


sounds like you have quite a mess to deal with.

mold may be a big issue. areas to be concerned about are between floor & joist, between plates & subfloor, general area in crawl space.

nails popping...can't recall the last time i saw a sub-floor nailed off.

glued & screwed is the way to go.

can the sub-floor be sanded smooth?

are MEP's roughed in?

is the structure sided or have shear installed?

sub-floor can be removed from under ext plates but it is a royal PITA...

jack the wall up or wedge them up in sections to R&R plywood.

depending on what you have may be faster/easier to take the walls apart in sections and deal with the sub-floor.

good luck...
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Unread 06-24-2020, 07:42 PM   #5
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Re: Water Damaged Subfloor On New Build


Get a crane lift the house including 1st-floor walls, replace the plywood and lower back the house, nail off the wall plates.
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Unread 06-24-2020, 07:46 PM   #6
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Re: Water Damaged Subfloor On New Build


Quote:
Originally Posted by greg24k View Post
Get a crane lift the house including 1st-floor walls, replace the plywood and lower back the house, nail off the wall plates.
Thats better than the road flare and start over idea.
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Unread 06-24-2020, 07:47 PM   #7
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Re: Water Damaged Subfloor On New Build


Im headed over to get pics here shortly. will post today or tomorrow.
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Unread 06-24-2020, 08:16 PM   #8
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Re: Water Damaged Subfloor On New Build


Having not seen; I’d sand it, screw the **** out of it then maybe put a layer of 1/2 screwed down over it after it’s all dried out.
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Unread 06-26-2020, 09:32 AM   #9
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Re: Water Damaged Subfloor On New Build


Quote:
Originally Posted by Shortstick View Post
Looking for tip on how to handle a subfloor replacement.

Got a new build that has been sitting open to the elements for at least all winter and now the subfloor is damaged and needs to replaced.

Second floor is easy, small rooms to take down the framing replace the damaged subfloor and reinstall. Nothing load bearing due to the truss design.

Downstairs is the hard part. several load bearing wall, but biggest question is how to replace is under exterior walls.

Any tips or tricks on how to accomplish this?

TIA
Man brother. That sucks.

I guess I would try the following:
  • Get a zero clearance circ saw and cut out all the plywood.
  • Inspect whatís left under the plates.
  • If itís a bit wavy, Inject runny glue and clamp the piss out of it. Add screws to hold it tight.
  • If the subfloor under a plate is too bad, sawzall it out horizontally and replace sections at a time. (Wedges will be a must to get some space.)
  • Install blocking under half the depth of the plate to tie the plate ply to the incoming new ply. Lots of subfloor glue for these blocks.
  • Install 1 ⅛Ē advantech subflooring. It handles wet very well.

This is one of many ways to attack this problem. As you dig into it, answers will show themselves.

Good luck.

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Last edited by wallmaxx; 06-26-2020 at 09:37 AM.
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Unread 06-27-2020, 04:13 PM   #10
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Re: Water Damaged Subfloor On New Build


Last time I had to take out just a small section of subfloor on some relatively new construction it was a *&^%ing nightmare. I need to find out what glue they used 'cause that stuff was holding down so well that the OSB was just tearing apart and leaving chunks stuck to the framing.
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Unread 06-27-2020, 10:26 PM   #11
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Re: Water Damaged Subfloor On New Build


Don’t take much to pull osb apart if it has enough glue under it
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Unread 06-28-2020, 04:55 PM   #12
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Re: Water Damaged Subfloor On New Build


Get a S.E. to sign off on the current expanded sub floor is an adequate diaphragm.....I can't any piece work removal ending with a sound structural floor system.......underpinning walls with FULL sheets of new subfloor....really?

Gypt crete it like a dorm or apartment floor add framing for the added dead weight and write off the 2" lower ceiling, sell it as super fire proofing.....No sprinkler needed....Cheap and FAST and proven tech.

2-3 dollars per foot square @ 2" thick ~20 Pounds per square foot load.
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Last edited by Fouthgeneration; 06-28-2020 at 04:59 PM.
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Unread Yesterday, 01:19 PM   #13
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Re: Water Damaged Subfloor On New Build


Quote:
Originally Posted by wallmaxx View Post
Man brother. That sucks.

I guess I would try the following:
  • Get a zero clearance circ saw and cut out all the plywood.
  • Inspect whatís left under the plates.
  • If itís a bit wavy, Inject runny glue and clamp the piss out of it. Add screws to hold it tight.
  • If the subfloor under a plate is too bad, sawzall it out horizontally and replace sections at a time. (Wedges will be a must to get some space.)
  • Install blocking under half the depth of the plate to tie the plate ply to the incoming new ply. Lots of subfloor glue for these blocks.
  • Install 1 ⅛Ē advantech subflooring. It handles wet very well.

This is one of many ways to attack this problem. As you dig into it, answers will show themselves.

Good luck.

Do you own this saw? I was wondering how it performs, been looking at it a while back, but didn't find to many reviews so left the idea of getting it and its been on the back burner since.
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Unread Today, 11:49 AM   #14
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Re: Water Damaged Subfloor On New Build


Quote:
Originally Posted by greg24k View Post
Do you own this saw? I was wondering how it performs, been looking at it a while back, but didn't find to many reviews so left the idea of getting it and its been on the back burner since.
No I don't......but one is for sale at a local shop 15 mins from here......pretty pricey if I recall.

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