Building A Wood Chimney Chase

Typically uses 2x4 structural members sheathed with osb or plywood exterior.

Building a wood chimney chase.

Codes allow a maximum of 90 degf temperature rise above ambient inside the the chimney chase well below the combustion or pyrolysis point for plywood. 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.

Common specifications construction details for a wood framed chimney chase dimensions for a wood framed chimney chase may be as small as 24 deep x 36 wide but are more typically 3ft x 5ft x. 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. Framing the chimney chase. Now that the frame has been completed guess who gets to clean up all that mess.

Build chase of fireplace just like any other wall structure by placing its uprights between plates and top plates to create a large box. Chimney chase a fireplace chase is essentially a knock out area of structure that hides a metal fireplace or cement blocks in a fireplace.