Can you use spray foam around chimney?

To keep a fireplace working properly, never use spray foam on the inside of the fireplace or the chimney, or on the damper. On the exterior surfaces of the fireplace and chimney, spray foam is fine because these surfaces won't get hot enough to melt it or to cause any damage.

How do you seal gaps around a chimney?

The gap is often sealed with metal flashing and a non-combustible caulk where it contacts the masonry. To bridge from the chimney to a drywall surface, you can patch in with cement board (such as tile backer) for the last 6 inches or so and caulk the cement board to the chimney with fireproof sealant.

Can you put insulation around chimney?

Historically, people have used the term "flue" and meant the chimney itself. So, with all of this information, the answer is you shouldn't insulate around a chimney. There are better ways to keep cold air out and losing the air you pay to condition.

Can insulation touch chimney pipe?

Fiberglass insulation can't and should not touch your stove's vent pipe. While fiberglass is not flammable, it can melt, causing fire risks. To get around this issue, you need to install a barrier of aluminum flashing between the vent and the insulation.

Can you seal a flue with expanding foam?

It should be ensured in all installations that the wall is sealed to the flue inside the property by using expandable foam, by pointing with sand and cement or using any other suitable material. The outer weather collar is deemed to create an adequate seal to the external wall.

Spray Foam Around a Fireplace Flue

What do you put around a flue pipe?

For the first joint adjacent to the stove you should fill the gap with thermal rope and then cover with black fire cement, from a cartridge is the most convenient way to do this. Any other joints should be sealed with VITCAS Heat Resistant Silicone.

Can insulation catch on fire?

Can it burn? Yes, it actually can! Although most insulation materials are extremely fireproof, a myriad of issues can cause your insulation to burn. Fiberglass insulation is made of glass combined with plastic polymers and is naturally fire-resistant.

Can you insulate around a brick fireplace?

Rigid foam board is the insulation of choice for this. It has high R-value per inch of thickness and doesn't absorb water. It could be attached to the brick with adhesive and mechanical fasteners, and a cladding material could be installed over it.

How do you fill a gap between a wall and a fireplace?

If the assumption are right and the gap is 3/4 inch wide, I would use a caulking backer in the gap before using a good grade painter's or acrylic caulk as a topper. The caulking backer is a round foam solid tube that can be cut to length, inserted into the gap to seal it and hold the caulk.

How do you seal a chimney chase?

Apply a bead of fire caulk or expandable foam to the top of the opening. Set the materials around the pipe, securing the materials to the open chase with screws or nails. Seal the metal collar down to the materials with fire rated caulk or fire rated expandable foam.

Is expanding foam fireproof?

Fire rated expanding foam can be used as an efficient seal against smoke and gas, providing up to 240 minutes fire rating.

Is Great Stuff spray foam flammable?

6. Cured foam is combustible and will burn if exposed to temperatures above 240°F (116°C). Do not apply GREAT STUFF™ foam around heaters, high heat lamps or recessed lighting fixtures, radiators, furnaces or fireplaces where it could contact heat conducting surfaces.

Should you insulate around a fireplace?

Install insulation without misalignments, compressions, gaps, or voids in all exterior wall cavities behind fireplaces. Cover the wall cavities with a fire-proof rigid air barrier or other supporting material to create a continuous thermal barrier and prevent a fire hazard.

How do you insulate an old chimney?

Insulating chimneys from the outside:

Cover the entire stack of bricks with a layer of rigid insulation (rockwool or expanded polystyrene) and half inch-thick plywood, which can then be covered to match the rest of the house.

Do you need to seal flue pipe?

Related Articles. The pipe connected to a wood or pellet stove should not need sealing unless it has a hole or leak in it. When conditions are right, the negative pressure and natural draw of the stovepipe causes the hot smoky air to rise through the pipe and out the chimney.

Does expanding foam react with copper pipes?

It certainly won't cause any issues with the copper, so don't worry about that.

Can you insulate around boiler flue?

We fully understand the concern and we can assure you that it will be fine to insulate all the way up to the boiler casing. Please note that you want to keep the ASJ Max paper way from any open flame or touching a metal flue pipe, as any fiberglass insulation touching flue pipes can pose a fire hazard.

Can you use silicone to seal a boiler flue?

If during installation Gas Safe registered engineers are unable confirm the suitability a sealant, e.g. an expanding foam product or silicone, from both the boiler and sealant manufacturers then the sealant product should not be used.

Should the chimney be insulated in the attic?

2 Fire and other hazards in attics. Factory-built metal chimneys should be kept from contacting insulation by a minimum 75 mm (3 in.) unless otherwise specified by manufacturer or local authorities.

Do chimney balloons work?

How does it work? Chimneys act like giant hoovers, sucking air out of your home. This causes cold air to be pulled in from other gaps, causing the cold draughts we notice. The Chimney Balloon effectively blocks the chimney, stopping warm air from escaping and stopping cold air from getting in.

Can great stuff be used around chimney?

To keep a fireplace working properly, never use spray foam on the inside of the fireplace or the chimney, or on the damper. On the exterior surfaces of the fireplace and chimney, spray foam is fine because these surfaces won't get hot enough to melt it or to cause any damage.