Without a cricket or diverter water can build up behind the chimney which acts as a dam as water runs down from a peak.
Building a chimney cricket.
Crickets shall be constructed in compliance with figure r1003 20 and table r1003 20.
Part ii irc building energy revise as follows.
A cricket or saddle shall be installed on the ridge side of any chimney or penetration more than 30 inches 762 mm wide as measured perpendicular to the slope.
Everything you want to know to do this yourself.
The intersection of the cricket and the chimney shall be flashed and counterflashed in the same manner as normal roof chimney intersections.
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A cricket also sometimes called a saddle is basically a small roof built to divert runoff water away from the upper side of a chimney.
The intersection of the cricket and the chimney shall be flashed and counterflashed in the same manner as normal roof chimney intersections.
Cricket or saddle coverings shall be sheet metal or of the same material as the roof covering.
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Chimneys shall be provided with crickets where the dimension parallel to the ridgeline is greater than 30 inches 762 mm and does not intersect the ridgeline.
The roof cricket is normally the same pitch as the rest of the roof but not always.
A miniature roof constructed from aluminum galvanized steel or stainless steel a chimney cricket can be installed on the rear of your chimney.
This cricket sheds rain water away from the chimney rather than allowing it to beat down onto the side of the chimney that is the most susceptible to water penetration.
Roof crickets are found on the high side of a chimney or when one roof meets another.
This area is the least noticeable from the ground yet likely has more damage than other sections of a masonry or prefabricated chimney.
What exactly is a chimney cricket.
Very sorry this video is so long but loads of good stuff.
With a peak that keeps water and debris away from your chimney this piece of flashing protects your chimney from water leaking into its bricks and mortar.
Crickets shall be constructed in compliance with figure r1003 20 and table r1003 20.
Before installing a roof cricket you first should understand what it is and why it is important.
R903 2 2 crickets and saddles.
Table r1003 20 cricket dimensions.