How Much Flashing Must Be Behind Cement Siding And Roof

In my opinion some sort of impervious membrane should be installed over the sheathing and behind the flashing both of which should be lapped by the siding and the flashing should have 2 4 inches exposed between the concrete and the siding.

How much flashing must be behind cement siding and 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. I wish i had an easy answer for you because what you are attempting creates a couple of problems. 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. 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.

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 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. There are a few general best practices you need to know. 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.

But unlike fiber cement siding wood is almost sure to rot. Bent into an l shape. First step flashing must be installed before the siding so that the siding can cover the top of the flashing. This flashing is typically field fabricated from a sheet of 26 ga.

Step flashing is used to provide a water tight connection where roofing adjoins a vertical juncture. The question is can those be removed and then flashing slid under the horizontal butt joints in the 4 8 panels. 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.

And when those corners start to decay they become. Galvanized sheet metal bent at a 90 degree angle i e.