Where to source expanded perlite

[Bronco9588]

I am restoring my fireplace and replacing the insert. I just went up to the roof to inspect the flue. I do not think insulation runs the length of the flue as the throat looks clear. I would like to fill with perlite and cement mix. Flue has stainless steel liner.

1) should I go with the lightest 1:8 mix ratio?

2) Where can I source the stuff? I have searched big box stores (small bags for garden), called stove shops, and called a concrete mixing company.

 

[bholler]

Just get a premixed and ul listed liner insulation

 

[Bronco9588]

What type of store sells that?

 

[kborndale]

Chimney supply stores.

 

[SteveKG]

I have bought it in large bags at contractor's supply/lumber yards in the past. Never seen it at big-box places.

 

[troutbeer]

A hydroponics store or garden center would carry it.

 

[begreen]

A hydroponics store or garden center would carry it.

Usually, they only have small bags. It may take a trip to a nursery supply store to get the big bags.

 

[bholler]

Or just order the proper stuff designed and tested for use in chimneys

 

[troutbeer]

Usually, they only have small bags. It may take a trip to a nursery supply store to get the big bags.

From a garden center, I agree; only small bags. I have purchased huge bags of large granule perlite at my local hydroponics store for growing my chili peppers. They sell it in that form since hydro growers use 100% soilless media and go through quite a lot of it an a season. The stuff I found would be perfect for making lightweight concrete.

 

[begreen]

Or just order the proper stuff designed and tested for use in chimneys

Like this?

EverGuard Pour Down Chimney Insulation Mix

EverGuard Pour Down Chimney Insulation Mix In some installations this is the best way to provide an insulation factor. For solid-fuel chimneys not meeting code, 1" of EverGuard Insulation Mix between masonry and the liner provides for zero clearance between the exterior of the masonry and...

www.cheapchimney.com

 

[bholler]

Like this?

EverGuard Pour Down Chimney Insulation Mix

EverGuard Pour Down Chimney Insulation Mix In some installations this is the best way to provide an insulation factor. For solid-fuel chimneys not meeting code, 1" of EverGuard Insulation Mix between masonry and the liner provides for zero clearance between the exterior of the masonry and...

www.cheapchimney.com

Yes there are lots of different brands. Thermix chimmix everguard etc etc