Exterior Chimney Chase Construction

Build chase of fireplace just like any other wall structure by placing its uprights between plates and top plates to create a large box.

Exterior chimney chase construction.

But a rot problem would better be blamed on construction or flashing errors that allowed leaks into the chase. Wood siding on chimneys wood shingles are often used as siding material for chimneys continuing from the roof area. Above the chase height as per manufacturer. 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.

Fire stop at attic and roof deck. If your home has a wood chimney chase with wood lap siding you need to pay special attention to it. 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. Frame the walls on the roof assemble 2 together then stand each set and nail off corners of last two joints.

Chimney chase a fireplace chase is essentially a knock out area of structure that hides a metal fireplace or cement blocks in a fireplace. There are a disproportionate number of wood chimneys with rotted siding and wall sheathing when compared to other types of siding and other locations. Frame the chase so the bottom of the vent is. Crickets are more reliable particularly in climates where snow can accumulate and lead to ice dams.

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. 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.