Do You See What I Do? - Remodeling - Contractor Talk

Do You See What I Do?

 
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Old 02-08-2019, 08:50 AM   #1
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Do You See What I Do?


This is a picture of the garage of a house we’re working on. What do you guys see here?

The house was inspected prior to sale. I reviewed the report and the inspector missed it.

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Old 02-08-2019, 10:25 AM   #2
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Re: Do You See What I Do?


What's a little thermal transfer amongst friends?

Tom

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Old 02-08-2019, 11:37 AM   #3
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Re: Do You See What I Do?


Mold?
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Old 02-08-2019, 11:47 AM   #4
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Re: Do You See What I Do?


8 shelving brackets with no shelves.?
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Old 02-08-2019, 12:06 PM   #5
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Re: Do You See What I Do?


What's that ceiling stain in the far corner?
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Old 02-08-2019, 12:22 PM   #6
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Re: Do You See What I Do?


Is it the poor choice of lighting, florescent fixtures here in MN is crap! Two weeks of below zero weather.
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Old 02-08-2019, 03:16 PM   #7
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Re: Do You See What I Do?


Looks like mold at every truss?

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Old 02-08-2019, 03:41 PM   #8
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Re: Do You See What I Do?


A classic case of "ghosting."
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Old 02-08-2019, 04:09 PM   #9
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Re: Do You See What I Do?


Quote:
Originally Posted by tjbnwi View Post
What's a little thermal transfer amongst friends?

Tom
Quote:
Originally Posted by Gumshoe View Post
A classic case of "ghosting."
heheheh....yup.
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Old 02-08-2019, 05:08 PM   #10
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Re: Do You See What I Do?


I see it. Seen it a fair amount. I'm not a mold expert, but I don't think it's mold. Although that would make sense. It's a black soot that develops on the joists, right in that area. Right where it is the coldest.

For the most part, I only see it when someone has a ventless gas heater. I have seen it with other types of heating, but never when its a gas furnace. Not saying it can't happen. I just haven't seen it.

People have asked me about it before. 99% of the time, they have a ventless gas heater.
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Old 02-08-2019, 08:24 PM   #11
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Re: Do You See What I Do?


So, there is not a consensus that that is mold?

There is no heater in the garage.

The exterior is brick veneer.

I got up into the attic and it is insulated (poorly but insulated). The roof sheathing looks pretty new. Called the county and the last permit pulled on the house was a reroof in October of last year.
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Old 02-08-2019, 08:28 PM   #12
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Re: Do You See What I Do?


Cut out a piece and have a look at the backside.
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Old 02-08-2019, 09:33 PM   #13
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Re: Do You See What I Do?


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Originally Posted by DaVinciRemodel View Post
So, there is not a consensus that that is mold?
Not here. I'm really interested in the final verdict, if there is one.

IMO, those shadowlines certainly have something to do with temperature differentials, but that could just be deposits from airborne... stuff, rather than the dreaded mold monster.
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Old 02-08-2019, 09:37 PM   #14
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Re: Do You See What I Do?


Quote:
Originally Posted by Tinstaafl View Post
Not here. I'm really interested in the final verdict, if there is one.



IMO, those shadowlines certainly have something to do with temperature differentials, but that could just be deposits from airborne... stuff, rather than the dreaded mold monster.
I think ya nailed it....dirt....

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Old 02-08-2019, 09:40 PM   #15
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Re: Do You See What I Do?


Quote:
Originally Posted by Tinstaafl View Post
Not here. I'm really interested in the final verdict, if there is one.

IMO, those shadowlines certainly have something to do with temperature differentials, but that could just be deposits from airborne... stuff, rather than the dreaded mold monster.
You might be right, because it's almost too orderly for mold.

So what do you figure happened? Are those shadows the warmer or colder parts of the wall? Then what?
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Old 02-08-2019, 09:54 PM   #16
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Re: Do You See What I Do?


Quote:
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You might be right, because it's almost too orderly for mold.

So what do you figure happened? Are those shadows the warmer or colder parts of the wall? Then what?
Probably a short heal on the truss, the truss is just cold enough in that spot to condensate, dirt collects over time. Pretty common here.
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Old 02-08-2019, 10:00 PM   #17
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Re: Do You See What I Do?


Studs on exterior walls are typically a bit cooler than the fiberglass insulation between them, thus the drywall reflects that. A quick google brings up this article; pay attention to the "Brownian motion" section.

https://buildingscience.com/document...ing-of-framing
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Old 02-08-2019, 10:54 PM   #18
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Re: Do You See What I Do?


It's ghosting from air currents poorly packed insulation

https://inspectapedia.com/interiors/...acking_IAQ.php

Last edited by Tom M; 02-08-2019 at 10:58 PM.
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Old 02-08-2019, 11:00 PM   #19
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Re: Do You See What I Do?


Quote:
Originally Posted by DaVinciRemodel View Post
So, there is not a consensus that that is mold?

There is no heater in the garage.

The exterior is brick veneer.

I got up into the attic and it is insulated (poorly but insulated). The roof sheathing looks pretty new. Called the county and the last permit pulled on the house was a reroof in October of last year.
My guess is not mold. Just dirt deposited due to thermal transfer.

Tom
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Old 02-08-2019, 11:07 PM   #20
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Re: Do You See What I Do?


Seen that a lot.

Even on the interior of fairly new houses. No just garages.

Most of the ones I've seen had NO attendant mold at all. Just really bad ghosting.

Nothing BIN 1-2-3 or Kilz Premium won't fix.

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