Exterior Chimney Chase Construction

Above the chase height as per manufacturer.

Exterior chimney chase construction.

For wind resistance if the chimney chase is passing through the roof structure rather than abutting the roof structure end it should be framed continuously through the roof structure not simply tacked on top of the roof sheathing. Frame the walls on the roof assemble 2 together then stand each set and nail off corners of last two joints. Right since the chimney chase carries an insulated metal flue rated for zero clearance possibly actually requiring an inch or more of airspace and because the chase is outside the building it s not normally insulated. 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.

But a rot problem would better be blamed on construction or flashing errors that allowed leaks into the chase. There are a disproportionate number of wood chimneys with rotted siding and wall sheathing when compared to other types of siding and other locations. Framing the chimney chase. The exterior of the chimney may require tuckpointing or replacement of siding materials to provide the best protection against moisture intrusion into the roof and interior structural materials.

Wood siding on chimneys wood shingles are often used as siding material for chimneys continuing from the roof area. Keep minimum clearance from pipe to combustibles. Typically uses 2x4 structural members sheathed with osb or plywood exterior building sheathing. If your home has a wood chimney chase with wood lap siding you need to pay special attention to it.

Chimney chase a fireplace chase is essentially a knock out area of structure that hides a metal fireplace or cement blocks in a fireplace. Frame the chase so the bottom of the vent is.