Many builders and designers believe that inadequate vapor barriers are the main cause of moisture problems and wood decay in walls.
Roof to wall flashing wood siding.
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.
Technical fact sheet no.
Then the house wrap and exterior wall covering are installed over this roof flashing.
Siding details at roof wall joint step flashings to avoid rot.
Our wall siding photo above right.
Likewise a 10 wide flashing will result in a 5 inch wide roof deck flange and a 5 inch vertical flange.
Stop wood sidings at least 1 inch short of the bottom leg at step flashings and other roof flashings.
A common problem area is the point where a gutter dies into an adjoining wall as the photo below illustrates.
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.
Obviously the further up the wall a flashing extends the greater the resistance to water intrusion.
Properly installed wall flashing is critical to your building s health.
I m afraid that with time that rain is going to find its way between the roof and the wall and.
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.
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.
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.
However the vast majority of water problems in walls are caused by water leakage from the exterior not by poor vapor barriers.
Often with new construction the roof flashing is first nailed to the wall.
Unless you re careful step flashing can allow water from the roof to slip behind the gutter and get behind the siding and even the housewrap.
I made this video this morning and i hope it help explain the flashing wall detail where the siding meets the roof.
A key part of my approach is using a special piece of flashing at this.
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 part of the house that it is attached to is wood lap siding.
The exterior of a house presents plenty of opportunity for leaks.
I had a contractor build a shed roof on the back side of my carport that extended over and attached to the house.
