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Forum: Conservation

11-16-13, 09:19 PM

Replies: 11

Fireblock foam burns

Views: 26,134

Posted By MN Renovator

How elastomeric is mastic? Is it flexible if a...

How elastomeric is mastic? Is it flexible if a joint moves or would it need to crack in order to yield to movement?

Seems foam isn't elastomeric at all either. I used it on a PVC plumbing...

Forum: Conservation

11-16-13, 10:27 AM

Replies: 11

Fireblock foam burns

Views: 26,134

Posted By MN Renovator

I understand that duct mastic is used on ductwork...

I understand that duct mastic is used on ductwork but is it also used on the critically hot areas such as exhaust flues? I'd figure a masonry fireplace sealant would be okay too. It might be a good...

Forum: Conservation

11-15-13, 10:37 AM

Replies: 11

Fireblock foam burns

Views: 26,134

Posted By MN Renovator

Here's another nice video, it goes into some...

Here's another nice video, it goes into some detail with informal torch application to a number of different insulation materials including multiple forms of batt insulation, cellulose, aircrete and...

Forum: Conservation

11-15-13, 10:14 AM

Replies: 11

Fireblock foam burns

Views: 26,134

Posted By MN Renovator

Granted it doesn't light up and burn like paper...

Granted it doesn't light up and burn like paper but it is easier to start on fire than say holding a lighter to a 2x4, for example.

I found a couple of demonstrations of how it burns. My...

Forum: Conservation

11-15-13, 09:39 AM

Replies: 11

Fireblock foam burns

Views: 26,134

Posted By MN Renovator

Fireblock foam burns

I know that spray foam is generally considered to be combustible even when cured but I figured that Dow Great Stuff™ Fireblock foam would be a little harder to ignite than it is.

I didn't put much...

Showing results 1 to 5 of 5

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