Building A Wood Chimney Chase

For chimney chases built into gable walls we install a partial diverter see image 2 again extending the sloped surface several inches beyond the corner see image 3.

Building a wood chimney chase.

Called kickouts these keep water from running behind the cladding below and into the wall assembly see images 1 2. Make the chase enclosure airtight chimneys built on an outside wall whether exposed or boxed with a chase are prone to backdrafting. To build a fire retardant chimney chase one might use fire retardant plywood and sure one could try spraying a fire retardant coating but those are not common practices. One solution is to install an insulated and sealed chase and to vent it to the interior so warm air can circulate.

Nfpa 211 reduces fire hazards by ensuring the safe removal of flue gases the proper installation of solid fuel burning appliances and the correct construction and installation of chimneys fireplaces and venting systems. Kickout flashings we always install diverter flashings wherever a roof intersects a wall. Build chase of fireplace just like any other wall structure by placing its uprights between plates and top plates to create a large box. Now that the frame has been completed guess who gets to clean up all that mess.

Framing the chimney chase. Typically uses 2x4 structural members sheathed with osb or plywood exterior.