Romex embedded in spray foam insulation

[Eddie702]

Temps can get over 200F for a short time

 

[Knuckle Dragger]

Not the same but related. I went to my plumbing code update a couple of months ago. They talked about spray foam if it is installed in a thick layer (they recommend installing it in multiple layers) it has generated enough heat to damage PVC and CPVC glued joints in pipes hot enough to cause leakage. The piping was pressure tested at rough in and passed. Then the house was insulated causing pipe leaks.

I Imagine the same heat can cause wire damage. They said if the insulation was installed in layers there is no issues.

I realize this is an installation issue separate from what the op is talking about

I plumbing contractor I know mentioned this to me as well. I believe that he had also personally experienced it.

 

[Knuckle Dragger]

I have dug out nm from the closed cell foam insulation and have noticed "spotty" discoloration to the sheathing. I didn't notice anything melted or deformed.

 

[jim dungar]

I plumbing contractor I know mentioned this to me as well. I believe that he had also personally experienced it.

Is the problem with the PVC or with the glue/solvent used at the joints?

 

[Knuckle Dragger]

Is the problem with the PVC or with the glue/solvent used at the joints?

I'm not sure.
We were actually talking about the Pex expansion connections in relation with the closed cell insulation.

 

[jim dungar]

I'm not sure.
We were actually talking about the Pex expansion connections in relation with the closed cell insulation.

Yeah, material that NM cable installations doesn't have.