Siding Roof Flashing Details

Second step flashing needs to extend 8 to 14 inches above the shingles according to the national roofing contractors association nrca.

Siding roof flashing details.

Building roof dormer side wall flashing materials choices installation details specifications. The roof deck flange of step flashings are to be fastened to the surface of each shingle in a position whereby the next course of shingles will cover up hide the flashing from view. Refer to the details. Include roof pitch roof geometry slope length and climatic factors such as heavy snowfall or rainfall.

All flashings must integrate with adjacent materials so water always flows to the exterior following the shingle principle. Stop wood sidings at least 1 inch short of the bottom leg at step flashings and other roof flashings. The vertical flange of the flashing is to extend up behind the adjoining siding. Technical fact sheet no.

This article describes mistakes at roof dormer sidewall flashing and roof dormer sidewall coverings that invite leaks rot and insect damage on buildings. Whenever possible begin trim installation at the downwind end of the roof farthest away from the source of prevailing winds to al low flashing laps to face away from wind driven rain. Our wall siding photo above right shows the beginning of deteriorating wood clapboards that were installed touching the surface of an abutting lower asphalt shingle roof. First step flashing must be installed before the siding so that the siding can cover the top of the flashing.

Where a slope roof meets a sidewall slip the upper legs of the step flashing under the sheathing wrap see illustration. Deck joist ledger spacer behind ledger housewrap or building paper housewrap or building paper exterior sheathing flashing drip edge z flashing 2 z flashing 1 deck board siding gap for drainage. Drip edge metal valley flashing dormer chimney and kickout flashing are types of roof flashing that shed water away from the connections between roofs walls chimneys and other building assemblies. If this is a repair job the siding must also be removed and replaced with the flashing.

Siding details at roof wall joint step flashings to avoid rot. 23 roof to wall and deck to wall flashing home builder s guide to coastal construction page 3 of 3 figure 3 deck ledger flashing.