Questions tagged [mold]

Preventing, identifying, or treating mold infestations in the home.

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Is this mold on my concrete slab foundation?

Is this black stuff mold on the concrete foundation? In the process of replacing the bath/shower plumbing and fixtures I started chasing mold from the surround. As I followed the trail underneath the ...
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Bought a house and very strong damp/sewer smell in main bedroom

Just recently bought a house which has been renovated. It was in a pretty poor state beforehand however since we've moved in (house has been vacant for 7 months at least) the main bedroom has a ...
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Dripping pipe in crawlspace - how much of an emergency?

I disconnected a refrigerator supply line (to the ice maker). The original tube was made of copper and I plan to replace it with braided stainless steel. However, I'm having some painting done this ...
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White Spots on Wood in Attic

Went up to the attic today and saw these white spots on the wood for the ceiling. Just wondering what they are and if I should be concerned? And also how to get rid of it and prevent it from coming ...
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Apartment has through-the-wall AC with mold, next steps

My apartment has though-the-wall AC with mold. Landlord informed me that ACs are not part of lease/apartment. AC was left by previous tenant? Is all mold in AC bad, as I have noticed many in different ...
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Moisture in bay window bench seat

I live in a 1940s house with uninsulated double brick wythe exterior walls. The interior wythe has some kind of masonry skim coat. The front wall of the house has a bay window. Last spring, I built a ...
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What is this gray material/film on the edge of my desk?

There is this gray material that only appears along the edges of my desk but on both exterior and interior edges. I inspected the desk closely after I first assembled it and did not find this material....
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Having trouble with mold in one spot

This is between a toilet and a bathtub. For whatever reason moisture is condensing here everyday. It is dry after a shower but at some point overnight it starts condensing. My main question is what is ...
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mold on window sill due to whole house humidifier

In the winter my house's humidity naturally drops to 20%. We had a whole house humidifier installed and raised the humidity to 35%. The air is much more comfortable but we get condensation on the ...
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How to fix moldy caulking over grout in bathtub corners?

As part of the cosmetic updates for the bath, I decided to remove the moldy caulking where the tile meets the bathtub. It looks like the previous owner put the caulk over the grout, I'm assuming ...
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My screened in porch with concrete slab for flooring smells like dirty feet at night

I purchased a home that at the time was an open porch with a concrete slab as a floor (painted). Early in 2021, I had it screened in and wanted to paint the concrete a different color. I stripped/...
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How do I identify source of mold smell in garage

Recently we had the garage redone - into a private "apartment" (bedroom, bathroom/shower, oven/stove, sink) We've begun to smell a moldy smell, the kitchen hasn't been used yet, though the ...
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Joists in Basement (for main floor) black - is this mold?

In a storage area in my basement, the ceiling is not finished. I notice recently that the wood joists for the main floor are covered in these patches of black. Is this likely mold or something else (...
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Is this mold on my OSB subfloor?

I wanted to get the opinion of the community here with this issue I'm having. New construction home here, pics are from the basement of the underside of the main floor subfloor. My builder is saying ...
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How to remove this shower drain grate (or otherwise remove mold from the pipe underneath)?

As you can see, there is black mold growing inside the white pipe under this shower drain cover. I've removed the 2 screws. The silver metal circular grate still feels stuck. If I try to pry it out ...
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health effects from mold in HVAC [duplicate]

We noted a musty smell coming from our heating ducts in the last few heating seasons. We first tried the usual things like changing filters, cleaning dust, etc., but finally called an HVAC tech to ...
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What do the parts not in plain English in this Concrobium anti mold product web page mean: "Cas #", "Builder", and "Withheld"?

This home improvement product company web page about an anti-mold product called Concrobium https://www.concrobium.com/products/mold-control-spray/ has the following table: Ingredient Cas ...
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5 answers
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Why are we to leave a front-loader clothes washer open, but not the dishwasher?

Everywhere, everybody, says to leave the door open on your front-load laundry washer so it can dry out and not accumulate mold. But no one, anywhere, says to leave the door open on your dishwasher. ...
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3 votes
1 answer
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is this mold where I have taken the wallpaper off?

I have started removing the wallpaper in my house and I've noticed this black stuff where the plaster has come off. I'm not sure what it is. I have tried looking at images of mold but not sure. It ...
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Rough hewn wood for porch construction

My front porch was constructed using rough hewn wood as an architectural choice, with knot holes, cracks and crevices. The wood is painted white. Although it looks great, after just a few months the ...
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Are these black marks on the wall from sanding?

I was told these markings on the wall are from "sanding". I believe the walls are plaster. I wasn't sure if I should believe it since it's in a strange pattern. However, it might be ...
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Blackish Stains on bedframe slats

I was in the process of disassembling my bed for an impending move, when I noticed some blackish stains on the bed slats. Wondering what they are. Is it salvageable or should I throw it out ...
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Is this termite damage? Mold damage? Something else?

I recently sold an old freestanding wine cellar and found a lot of dust and some mold underneath and behind it, plus this circular area on the baseboard, with some wood shavings below. Doesn't look ...
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2 answers
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Help me identify: Mold or fungus or Moss?

I live in a rental house and I see this growing on roof. What is it: is it moss mold or some fungus/algae? Should i be worried for my health? The clear line where it grows is likely because it has ...
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Fixing water-damaged, rotting frame. Who to hire?

I'm renovating my basement bathroom and feel over my head as maybe this is a bigger problem. First time home owner. What professionals should I hire to assess/fix this issue? Please be specific ...
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smell behind skirting board in basement room

I live in a house when one floor is basement. We had some damp bubbles in one of the room walls and the builders who renovated the house in 2020 came to fix. They checked the whole perimeter of the ...
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Daylight basement remodel, found mold on what appears to be drywall between exterior siding and studs. Do we need to remove ALL the siding to repair?

While working on removing paneling in the daylight basement, we discovered mold on what appears to be black papered drywall in between the exterior siding and the studs. This was pointed out during ...
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2 votes
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What is this dirt on the top of my high ceiling wall, how do we remove?

We just noticed there is some dirt on the wall by my foyer close to the ceiling. On the other side of this wall is a small attic space. The wall to the right, where the bar is, has a bedroom on the ...
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3 answers
162 views

How can I get my building owner to deal with a mold issue?

I live in an apartment with no ventilation to the outside. The bathroom fan is ductless as is the range fan in my Kitchen. I have a mold issue in the apartment due to the lack of proper ventilation ...
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Insulating behind tar paper?

I have a home built in 1959 in Southern California with stucco exterior. I’m removing the drywall to do a major renovation and bring my wiring up to code. I noticed there is no insulation and just ...
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These odd stains for appeared in the top room of my house. They weren’t here a couple of days ago. Could they be mold? Water stains?

Blotchy stains on the ceiling. These go all around the room. [
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Black stains in wood, identifying the cause

I found a used bedroom furniture set which includes a bed frame and box spring. I've put together the bed frame but upon looking at the box springs more closely, I see there are some dark stains ...
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What is the cause of this discoloration on stucco siding?

I was wondering what this greenish discoloration is on my stucco. I think it might be water related since there’s some wood rot I’ve felt under that area (a whole other can of worms, I know). I Was ...
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Mold or rust stain on roof truss

Paid a visit to my attic earlier today to see if there was any winter damage. Looking all good except for a small piece of truss that has a black stain on it (see picture). I would have said mold ...
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Me and my mom and dad moved to a older house since we have moved in we have had health problems

Me and my mom and dad have been having health problems since we have moved in our house in October , have brain fog and anxiety and my alleges and ashms and rashes and my mom and dad have been having ...
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Can this garbage disposal be saved ? Black gunk doesnt drip down to cabinet floor but my skin crawled when i saw this?

Garbage disposal is about 3 years old. It got jammed , so i tried to find the reset button on bottom. It wouldnt budge so i got a flashlight and got on the floor to make sure i was pressing right ...
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1 answer
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Should I repair this very small area of minor water damage on my bathroom floor?

I’m getting ready to install LVT over existing VCT in my bathroom, and when I pulled up the shoe molding I discovered that the corner of the floor next to the shower has a slight soft spot at the very ...
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2 answers
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Does mould growth definitely indicate a leak?

I've moved into a new place that had some mould growth on the ceiling in one of the bedrooms. I found a leak in the roof that corresponded and patched that up and cleaned up the mould. A few weeks ...
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1 vote
1 answer
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How much stainblock paint to use in bedroom and where?

I'm renovating my bedroom. On the north wall, there will be freestanding cabinets (wardrobes) against the wall; all interior walls except to the right (east) which is exterior. There's no previous ...
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What could cause a central A/C system to smell but only after central heating had been used?

We have a central heating and air conditioning system in a single family home (in Southern California), where there is a large intake vent in the house that goes directly to the central house fan and ...
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2 answers
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Mold on below grade garage block walls

I have a below grade 2 car internal garage.  Basically the house is built into a slope that rises toward the back yard with the garage doors on the front of the house.  So the rear wall is completely ...
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2 votes
3 answers
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Should I use vapor barrier for a framed floor over a slab?

What to do about the vapor barrier? I am currently using a formerly unheated basement room as home office. The room is not properly insulated and rather hard to keep warm. I am thinking about ...
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2 answers
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What kind of treatment should I use on bottom wall plates to prevent decay?

I have a bathroom project in my basement. I made the mistake of not using pressure-treated lumber for the bottom plate. Everything is roughed in, and I have access to the framing since I haven't put ...
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Does mold in a loggia means that the loggia must be replaced?

My apartment has a loggia which used to be a balcony (it is now an extension of the living room without any separation between them - the door that was there was removed). This was done by the ...
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1 answer
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Is this mold or just black wood?

Are the black spots on my OSB mold? If so, should I be concerned? We had a problem with vent but has been corrected. Thanks. Image is of worse area in attic.
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Upper Floor Window Condensation Issues - HRV?

We live in a 2 level home with basement in central washington. The winters average 20-36 degrees Fahrenheit with humidity levels of 70-99%. Summers are fairly warm to hot with lower RH. Our issue is ...
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1 vote
1 answer
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Possible mould damage from burst pipe?

On 15th December 2020 we became aware of a burst pipe on the side of our house. The source of the leak was the cold water pipe leading into the hot water system on the side of the house (brick veneer)...
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How can I mouldproof a conservatory?

We bought a small conservatory a few years ago. Despite following all the available advice (minimising condensation, cleaning regularly, etc...) mould still accumulates in the corners. What can I do ...
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Mildew around window retrofit inserts

Some of the windows in our house have mildew around the replacement window inserts (~18 years old). Mostly at the bottom. The original frames were aluminum, the inserts of course are PVC. The ...
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Mold on Bathroom Ceiling

I have a popcorn ceiling in my bathroom that has a tendency to collect mold. I clean it off with bleach but it always comes back. There was no mold prior to remodeling the bathroom a few years ago, ...
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