If you are installing a new unit the self adhesive flashing 43 the home depot will cover the inside of the framing as well as the sheathing.
Flashing under aluminum siding.
Snap a chalk line cut out the siding and tack up the ledger board.
Install the kickout flashing.
Fasten that shingle with two galvanized nails at the.
Seal small cracks and gaps in your siding under 1 4 inch wide using an acrylic latex caulk.
The best solution is a preformed or custom bent kick out flashing to divert the water away from the siding.
Slice along the bend line about 4 inches into the first piece of flashing at the bottom of the roof with tin snips.
Lay a shingle over the step flashing starting at the roof edge.
Step 7 seal larger gaps up to 1 2 inch wide with polyurethane caulk.
If the window already exists the self adhesive flashing will likely cover the sheathing and any window flanges only.
Maybe in this case the flashing extends upwards behind the building siding forming a zee shape that might reduce this risk.
Start by making an outline on the siding where you want to position the ledger board.
How to install step flashing under siding 1.
This results in a 2 inch minimum head lap.
In addition to metal flashing self adhesive flashings similar to waterproof shingle underlayment wsu sheets used for roofing edges are often applied around window or door openings.
Kickout flashing installs just like standard step flashing except that half of the kickout flashing hangs over the edge of the roof.
Details like this risk rot and insect damage to the structure.
Where the step flashing terminates along a sidewall is a common trouble spot for moisture problems.
Make the outline large enough to include space for the deck boards on top the ledger and any trim boards on the sides.
Depending on the reveal of your siding the flashing length will be inch less than the reveal.
Simply apply this inexpensive filler into the cracks to seal.
In areas where snow may build up add a wide band of peel and stick membrane over the step flashing but under the sheathing wrap as shown.
A better way is using simple extruded aluminum inside corner w flashing that will prevent water intrusion and last as long as fiber cement siding.
The metal flashing placed on wall top slopes back towards the building directing water inside the structure.
Then slip flashing behind the siding covering the top edge of the ledger.
This is messier than acrylic latex but effective.
The recommended length of step flashing is typically a minimum of 2 inches longer than the exposure of the roofing material.
Paint works well over it.
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.
Dog ears will be cut on both sides approximately inch from the bottom and then folded to create a stop that will locate itself on the top of the underlying row of siding but not be so long that it will run into the nails that hold the siding of the row being flashed.
