"I think Sean is onto the answer. The blotchyness makes me think they may have used a spray can primer like "Killz" in a can to cover water damage or mold. If they shot it on there thick enough it could create a thermal difference.
"SW exposure. What is outside? Was it sunny? Trees? Large Shrubs? I have had the shade pattern show on an interior wall.
You have a house with a Brick Facade. That means you must consider the thermal…"
Shoot I have a picture of a smiley face on a wall - reason it was sprayed with something & then painted over, but it was enough to create a thermal difference that can be caught via camera only"
Did an energy assessment today and captured this image of an exterior wall. I believe the wall is framed, with sheet rock and a brick facade. It is a 1929 vintage home, but I believe there have been renovations. This image is taken on the second floor and is on an exterior wall with a SW exposure. Any ideas as to this unusual…See More
"Larry, are they trying to assign blame? If so, it's a bit like blaming the foot for Colin cancer. If this was a prescriptive job and not a home performance job, you can't blame the insulation guy for the homeowners improper operation of…"
"Yuck! I would check the basement or crawl space, check humidity levels and see what was under the foam.
Who did the work?
Were they certified?
how old was the Foam?
Was the job inspected.
What about that Electric?
"Long time no hear Bud & good points
As for codes - yes it requires a barrier unless the foam meets certain requirements which isn't that big of an issue doing the attic floor as the drywall underneath counts & then you apply blown in…"
"You have a BD, that's good. IR would add another star.
@Larry "I would have to think they removed the existing insulation but you never know"
Looking at their foam job I wouldn't expect they did a lot of cleaning up.
"I don't know what is under the foam, but probably just the floor deck. I would have to think they removed the existing insulation but you never know. I suspect that the moisture problems are emanating from a damp basement or crawlspace and are…"
"The contractor that did that should have his toys taken away.
To answer your general question, applying rigid or spray foam to an attic floor would follow the normal rules of ensuring any surface that can come in contact with humid air must always…"
"Hi Bud. This home is in the North East (NYC Suburbs). We are a mechanical contractor and were called in to do some work unrelated to building performance. The homeowner did complain that since the attic insulation they have been experiencing…"
"Hi Larry, what a mess. Give us your climate zone so we know outside temp and humidity.
Did you do a blower door test to see how tight the building is, I'm wondering where else he might have used that foam?
What is in the basement,…"
"The insulation job is quite simply a freaking eyesore & mess - with that it shouldn't be the issue where they are smelling mildew, getting bugs in, etc... (assuming you are talking about inside the house) - put your sleuthing hat on, find…"
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