Attic Concrete Chimney Fire Block

A masonry chimney can be made up of a variety of materials including bricks mortar concrete block stone flue tile cast iron and steel.

Attic concrete chimney fire block.

Include drywall facing the chimney. Chimney fire clearance distances between masonry wood framing. I put my fire block 1 2 drywall in first then caulked with fire resistant caulk to fill gaps along the concrete wall. Requirements for masonry chimney attic fire block.

Material for fire blocks. The 2012 international residential code allows for the use of materials other than standard lumber although i do not recommend any of them. Concrete chimney block measures 16 in. I used a 6 level and a straight 2x4 to determine how wide to cut my drywall fire block so that i would not have to trim the drywall after the walls were in place.

Assuming you don t want to change your plans or if the chimney is already built then it is perfectly possible to insulate the chimney as it passes through your attic. Space the drywall an inch away from the chimney. 1027 jefferson ave utica ny 13501. Cracks in a masonry chimney particularly concrete block chimneys are often caused by chimney footing tipping or settlement inadequate foundation frost poor drainage missing rain cap porous masonry improper construction in freezing climates thermal expansion of the clay flue liner improper construction.

And accepts an 8 in. If you do have another fireblock with listed firestop installed at the attic floor level you ll need either an attic insulation shield around that chimney pipe or better yet seal off that opening with t ply so the chimney is no longer visible. The distance between a brick stone concrete block or other masonry chimney and the nearest combustible material such as wood framing is an important fire safety consideration that must be respected. This article describes the fire clearances required for masonry chimneys.

Surround the chimney with four stud walls that you pre assemble on the floor of your attic. Features a hole in its center. The center hole allows you to install chimney liner not included. Suitable for use with chimney liner.

Lee the building code requires fireblocking to cut off the passage of fire within concealed spaces in a building of combustible construction including the space around a chimney where it penetrates floors and ceilings. The blocks must be as wide as the wall. For a 2 x 4 wall use a 2 x 4 block for a 2 x 6 wall use a 2 x 6 block.