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Old 02-03-2012, 02:15 PM   #1
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Wet Floor Joists


I recently discovered a leak under my dishwasher. I think I caught it pretty soon because i only had to about 50 sq ft of subfloor damaged. I decided to pull the subfloor and ServPro was finished drying it (4 DAYS). Now that I have the subfloor up I have noticed that my floor joists are wet. Is there anything I can do or do I just need to call ServPro back out to dry the joists. Thankfully I live in SC and we are having a VERY mild winter.....(knock on wood)


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Old 02-03-2012, 03:02 PM   #2
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Those joists look pretty moldy. I would treat them with bleach, then let them air dry for a few days. No need to get Servpro back out, unless you are in a big hurry to dry the joists. Doesn't look like there was any structural damage, just get rid of the mold, let them dry, then repair.

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Old 02-05-2012, 03:57 AM   #3
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The joists themselves look to be structurally sound. They just have lots of mold on them. I would not try to remove the mold yourself though as you could mess up the integrity of the wood. You should call a mold abatement team to come out and remove it. They can remove it by spraying it off with dry ice.

Last edited by jasin; 02-05-2012 at 04:16 AM.
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Old 02-05-2012, 04:09 AM   #4
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Do NOT need hangers. Joists are resting on the sill.

Last edited by jasin; 02-05-2012 at 08:21 AM. Reason: Removing the stuff about Hangers. Oh'mike rightly pointed out that they are on the sill.
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Old 02-05-2012, 04:27 AM   #5
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I noticed as well, that you have a sheet of osb. I hope you are not using that for your sub-flooring. Osb is not made for sub-flooring!
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Old 02-05-2012, 06:14 AM   #6
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In most areas OSB is an acceptable subfloor. I live in the midwest and it has been used for years with no problems. Just use bleach as Daniel said. It will kill the mold.
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Old 02-05-2012, 06:37 AM   #7
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Your being given the wrong info.
There's no way anyone here from a picture can tell you those joist are fine. Someone there on site is going to have to poke around and see how deep the rot is.

No mold control company I've ever heard of would suggest using bleach to treat black mold on wood like that. There going to treat it with one form or another of Boric Acid. It kills the mold and stops it from coming back.

One poster gave you info on the wrong joist hanger to use. It would be one that looks like this. (Just make sure there the right hight for the joist you have.)
http://strongtie.com/products/connectors/LUS-HUS.asp

Then they misinformed you that OSB should not be used as a subfloor, wrong again. Only have a picture to go by but that subfloor you have looks like Advantec. OSB and Advantec as long as there 3/4" thick will work fine and has been used in millions of homes all over the world so I'm not sure where they came up with that idea.

Last edited by joecaption; 02-05-2012 at 06:44 AM.
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Old 02-05-2012, 07:12 AM   #8
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Quote:
Originally Posted by woodman58 View Post
In most areas OSB is an acceptable subfloor. I live in the midwest and it has been used for years with no problems. Just use bleach as Daniel said. It will kill the mold.
The National Tile Contractors Association recommends that OSB NOT be used as subfloor.

Last edited by jasin; 02-05-2012 at 07:17 AM.
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Old 02-05-2012, 07:15 AM   #9
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Originally Posted by joecaption View Post
There's no way anyone here from a picture can tell you those joist are fine.
If it were not structurally sound it would be cracked, sagging, warped, twisted, etc.. something. We do not see any of that though nor is there any indications there is any of that.

Last edited by jasin; 02-05-2012 at 07:18 AM.
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Old 02-05-2012, 07:18 AM   #10
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Originally Posted by joecaption View Post

No mold control company I've ever heard of would suggest using bleach to treat black mold on wood like that.
I agree, avoid using bleach.

Last edited by jasin; 02-05-2012 at 07:53 AM.
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Old 02-05-2012, 07:22 AM   #11
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Originally Posted by joecaption View Post
There going to treat it with one form or another of Boric Acid. It kills the mold and stops it from coming back.
"Dry ice blast cleaning is quickly establishing itself as a favored method of cleaning in mold remediation (mold removal). Dry ice blasting is superior to cleaning mold compared to traditional labor-intensive techniques such as sanders, scrapers and wire brushes. The dry ice process cleans as thoroughly or more so and in dramatically less time. Also, compared to soda blasting, dry ice blast cleaning is as fast and creates far less mess." (Association for Facilities Engineering)
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Old 02-05-2012, 07:25 AM   #12
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Hangers are not needed as the floor joists are sitting on a sill plate---No idea where that idea came from.

OSB is the most common subfloor in use today---Don't know what citation that came from either--

TCNA (tile council) book sites the use of OSB under tile---another idea without any real world experience--

Sorry about the bad info---You will find good info here along with some very weak info from a new member.
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Old 02-05-2012, 07:28 AM   #13
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Look again at the top of the floor joist, looks all punky to me.
Fungus eats the cellulose holding the wood fibers together causing the wood to become soft.
Fungus eaten wood does not do any of the things your suggesting to look for. It just falls apart.
I've seen it so bad I could snap off whole sections with my bare hands.

What would make you think there was tile on that floor?
Even of there was tile going to be laid you simply go over the floor with 1/2 subfloor rated plywood. Done all the time.
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Old 02-05-2012, 07:38 AM   #14
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Originally Posted by joecaption View Post

Then they misinformed you that OSB should not be used as a subfloor, wrong again. Only have a picture to go by but that subfloor you have looks like Advantec. OSB and Advantec as long as there 3/4" thick will work fine and has been used in millions of homes all over the world so I'm not sure where they came up with that idea.
Plywood is manufactured with the grain still intact, in layers whose grain alternates orientation 90 degrees. This is what gives plywood it's strength. OSB, MDF, HDF, etc.. all lack this particular feature. OSB, when used as a subfloor, actually tends to develop sags between the joists. It also makes a poor base for fastening hard-surface flooring as well, as it chips easily.

Last edited by jasin; 02-05-2012 at 08:30 AM.
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Old 02-05-2012, 07:42 AM   #15
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Quote:
Originally Posted by oh'mike View Post
Hangers are not needed as the floor joists are sitting on a sill plate
I did not notice they were on the sill. Sometimes seeing things like that in a picture are hard to see. Nevertheless, you are right. Thanks for pointing that out.

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