Wood Framed Chimney Details

B and the stiffness or modulus of elasticity e may be determined from the grade mark for lumber used as joists rafters and decking.

Wood framed chimney details.

Platform and balloon frame construction. On 2016 11 09 by jon. 4 details for conventional wood frame construction. The photos below show a few rotted chimneys i ve come across in the past few months.

Common specifications construction details for a wood framed chimney chase. Some builders frame the entire chase beginning inside the structure where for example a. When rotted siding is found at a wood chimney chase the next step is to have some of the rotted siding removed to have the wall sheathing below the siding inspected for water damage. 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 the necessary height to meet roof clearance requirements.

Properly constructed details of a wood framed chimney are necessary to prevent water intrusion figure 1. The new ibc international building code that most places have adopted says that combustible framing must be 2 clear of the firebox or chimney. Wood shingles and shakes 88 other exterior finish 88 installation of siding 89 installation of wood shingles and shakes 93 nonwood coverings 95 chapter 14 framing details for plumbing heating and other utilities 97 plumbing stack vents 97 bathtub framing 98 cutting floor joists 98 alterations for heating ducts 99. Platform construction is much more common than balloon framing though balloon framing was employed in many two story houses before 1930.

Combustible sheathing can touch the masonry to close the gap in an exterior wall for example if it is at least 12 from the nearest point in the firebox or flue. Detail of flashing and brick veneer support of a wood framed chimney. The bending strength f. However there are alternative ways to extend a chimney top including a wood chase properly constructed around an insulated multi wall fire rated metal chimney flue.

Water intrusion at the top of the chimney is typically prevented by a metal crown that laps down and over the vertical face of the adjacent brick veneer. My wood framed fireplace has a 25 years old double wall steel liner that is corroded.