Class A pipe through Cinder block?

[NVHunter]

What would everyone use around Class A pipe to seal it around the opening in the cinder block wall we put an 8" hole in?

The pipe is snug but there's a few gaps here and there. What do you suggest I seal it with?

Contractor said Firestop foam......

Don't think that's correct...?

 

[bholler]

Contractor said Firestop foam......

Don't think that's correct...?

Absolutly not it needs to be non combustible and firestop foam is very combustible. We use mortar

 

[NVHunter]

Absolutly not it needs to be non combustible and firestop foam is very combustible. We use mortar

Copy that! Already have a bunch of mortar on hand to patch up an old thimble. I'll use that!! Thanks

 

[revdocjim]

Depending on how big your gaps are, just leaving it as is and putting a sheet metal plate on both sides should work as well.

 

[NVHunter]

Depending on how big your gaps are, just leaving it as is and putting a sheet metal plate on both sides should work as well.

Yea the gaps are pretty minuscule. I was thinking maybe pushing some fire gasket into the front and then putting the sheet metal ring up to help keep it in place.