• Last Updated:
  • Dec 27th, 2020 6:52 pm
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[OP]
Newbie
Mar 11, 2012
3 posts
1 upvote

Is this mold?

Bathroom is being renovated, and the insulation is moist with black spots. Could it be mold?
Should it be replaced even if it isn’t?
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Last edited by Jesbui on Dec 27th, 2020 6:45 pm, edited 1 time in total.
9 replies
Deal Fanatic
Nov 21, 2013
5654 posts
3984 upvotes
if it is wet, from the pic black spots is likely mold. I would not take any chances and replace. But first you should find the source of the water infiltration if any
Deal Expert
Feb 24, 2007
15062 posts
2645 upvotes
That bottom plate looks like it is completely covered in mold. I would start with the check of the roof/ice shield and any water penetration from the exterior.
Newbie
Jan 3, 2009
93 posts
33 upvotes
Toronto
yeah thats mold . replace it
Deal Addict
User avatar
Oct 14, 2010
1384 posts
821 upvotes
Barrie ON
It sure looks like mold, and it should be removed and replaced.

The horizontal board on that wall, and the small hole in the drywall suggests that you had a tub/shower in that location.

The good news is, that since the mold is midway in the wall, it looks like the moisture didn't enter from the exterior (roof or walls), but probably right through the tiles, because they didn't use the proper cement board and waterproofing procedures during the initial install.

When you remove the old insulation, try and verify that the water didn't start from higher up. Also confirm if that is regular drywall, or special waterproof/resistant type.
Deal Fanatic
Dec 5, 2009
5677 posts
3429 upvotes
Rick007 wrote: It sure looks like mold, and it should be removed and replaced.

The horizontal board on that wall, and the small hole in the drywall suggests that you had a tub/shower in that location.

The good news is, that since the mold is midway in the wall, it looks like the moisture didn't enter from the exterior (roof or walls), but probably right through the tiles, because they didn't use the proper cement board and waterproofing procedures during the initial install.

When you remove the old insulation, try and verify that the water didn't start from higher up. Also confirm if that is regular drywall, or special waterproof/resistant type.
I could be wrong , but If the moisture entered through the tiles , I think the wood would be covered in mold too.
Deal Addict
May 23, 2006
1019 posts
223 upvotes
Vancouver
Don't think it cost much to replace insulation when you have already opened everything up.

I think all houses have mold to a certain extent....especially wet areas such as bathroom...
Deal Addict
User avatar
Jan 23, 2015
1148 posts
642 upvotes
Woodbridge, ON
eldiablo wrote: That bottom plate looks like it is completely covered in mold. I would start with the check of the roof/ice shield and any water penetration from the exterior.
Bottom plate is not visible. What you're seeing is the black gasket that wraps the plate.
Member
Feb 11, 2016
202 posts
196 upvotes
Looks like mold
Replace insulation. Find source. Open up more drywall if it looks like there's mold behind it and replace that as well
[OP]
Newbie
Mar 11, 2012
3 posts
1 upvote
Thank you so much everyone for your expertise!

I’ve uploaded additional photos, so I hope that helps. The bottom isn’t mold, but some sort of black film barrier.
Our contractor said the insulation isn’t moldy and the discolouration is from that black film barrier. However, I still don’t feel comfortable leaving it as is, and would rather have it replaced.

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