Flashing Under Aluminum Siding

This is messier than acrylic latex but effective.

Flashing under aluminum siding.

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. Install the kickout flashing. This results in a 2 inch minimum head lap. 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.

The recommended length of step flashing is typically a minimum of 2 inches longer than the exposure of the roofing material. 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. If the window already exists the self adhesive flashing will likely cover the sheathing and any window flanges only. Then slip flashing behind the siding covering the top edge of the ledger.

Start by making an outline on the siding where you want to position the ledger board. Cut a piece. Make the outline large enough to include space for the deck boards on top the ledger and any trim boards on the sides. 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.

The metal flashing placed on wall top slopes back towards the building directing water inside the structure. 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. Otherwise dripping water will leave its mark along the siding. Where the step flashing terminates along a sidewall is a common trouble spot for moisture problems.

Depending on the reveal of your siding the flashing length will be inch less than the reveal. Kickout flashing installs just like standard step flashing except that half of the kickout flashing hangs over the edge of the roof. Step 7 seal larger gaps up to 1 2 inch wide with polyurethane caulk. Paint works well over it.

Maybe in this case the flashing extends upwards behind the building siding forming a zee shape that might reduce this risk. How to install step flashing under siding 1. Simply apply this inexpensive filler into the cracks to seal. 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. The vertical flange of the flashing is to extend up behind the adjoining siding. Fasten that shingle with two galvanized nails at the. 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.

Details like this risk rot and insect damage to the structure.