How Much Flashing Must Be Behind Cement Siding And Roof

On a wall to be covered with wood cement board vinyl or metal siding the step flashing and associated roofing must be installed first so the siding can cover the top of the step flashing on.

How much flashing must be behind cement siding and roof.

There are a few general best practices you need to know. Flashing a wood framed chimney is like flashing a dormer except there s no roof behind it to direct uphill water away without protection water can leak into the joint and rot your walls. I wish i had an easy answer for you because what you are attempting creates a couple of problems. And when those corners start to decay they become.

There are many different metal flashing shapes but in your case the metal laps over the fascia board perhaps 1 4 inch then is bent at a 90 degree angle to pass over the top of the fascia board then bent again at a 90 degree angle to go up the wall so that it extends behind the first row of vinyl siding. The step flashing should be visible below the siding because siding installers should leave a 75 to 1 5 inch gap between the siding and the roof below. This flashing is typically field fabricated from a sheet of 26 ga. One installe told me he would have to rip it all out which i thought was a bit much if flashing can be inserted somehow or middle panels 1 of 3 layers replaced and flashed on top and bottom.

Galvanized sheet metal bent at a 90 degree angle i e. When it comes to flashing siding corners many builders simply use a 1x wood corner. This gap can get covered over if the home has been roofed over since the siding was installed thus building up the roof height. First step flashing must be installed before the siding so that the siding can cover the top of the flashing.

Step flashing is used to provide a water tight connection where roofing adjoins a vertical juncture. Step flashing is the most time consuming of all flashing jobs on the roof because you must complete it step by step as you shingle up the roof. The solution to rotting sidewalls is a small piece of bent metal called a kickout flashing at roofing suppliers which simply directs all that water away from the wall. Bent into an l shape.

Even if the roof has been properly flashed against the sidewall this one hasn t water can still run down the side of the house and behind the siding causing rot. The question is can those be removed and then flashing slid under the horizontal butt joints in the 4 8 panels.