Firebox sealant?

Old 02-10-19, 06:26 AM
Thread Starter
Join Date: Nov 2002
Location: MD
Posts: 374
Upvotes: 0
Received 0 Upvotes on 0 Posts
Firebox sealant?

We have an 70 year old fireplace and the grout/sealant between the firebox and the surrounding flagstone is crumbling, leaving a gap of around 1/2". I've used a caulk like sealant in the past on other projects to seal small gaps but this gap is too large for this. I see there is some mortar & cement out there that looks to be more appropriate - what would you guys recommend? The gap around the firebox runs probably around 10'.
Old 02-10-19, 07:07 AM
Join Date: Oct 2008
Location: USA
Posts: 2,605
Received 28 Upvotes on 27 Posts
Try Rutland Fireplace Mortar. It comes in a tube and is applied with a regular caulk gun. It's gooey when it goes on, but then, within 30 days, needs to be fired at 500 deg F, or higher, to achieve full strength. I would buy just one tube and see how it does. Let us know.

Thread Tools
Search this Thread
Ask a Question
Question Title: