Siding Roof Flashing Details

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

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This article describes mistakes at roof dormer sidewall flashing and roof dormer sidewall coverings that invite leaks rot and insect damage on buildings.

Siding roof flashing details.

I made this video this morning and i hope it help explain the flashing wall detail where the siding meets the roof. 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. Stop wood sidings at least 1 inch short of the bottom leg at step flashings and other roof flashings. First step flashing must be installed before the siding so that the siding can cover the top of the flashing.

All flashings must integrate with adjacent materials so water always flows to the exterior following the shingle principle. Click to enlarge any image otherwise water will wick up into the flashing leading to paint failures and decay see figure 1 6 above left. The vertical flange of the flashing is to extend up behind the adjoining siding. 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.

Technical fact sheet no. Include roof pitch roof geometry slope length and climatic factors such as heavy snowfall or rainfall. 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. If this is a repair job the siding must also be removed and replaced with the flashing.

Ct 07 concrete or masonry wall base flashing with a 5 course flashing system not suitable for stucco wall assemblies pdf dwg ct 08 steel or wood stud stucco wall with z bar. Where a slope roof meets a sidewall slip the upper legs of the step flashing under the sheathing wrap see illustration. Building roof dormer side wall flashing materials choices installation details specifications. Siding details at roof wall joint step flashings to avoid rot.

Refer to the details. 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.