Flashing Under Siding

The recommended length of step flashing is typically a minimum of 2 inches longer than the exposure of the roofing material.

Flashing under siding.

The seat dimension 3 8 in corresponds to the siding thickness. Begin at either end of the wall and set the level middle section of the z flashing onto the top edge of the siding panel with the wider flange upward and against the wall framing. How to install step flashing under siding 1. Here are four ways to use metal flashing to prolong the life of siding.

This results in a 2 inch minimum head lap. 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. Galvanized steel z flashing is made from 28 gauge galvanized steel. Flush the end of the flashing length with the wall corner and secure the flashing to the framing with an 8d nail at each wall stud.

Slice along the bend line about 4 inches into the first piece of flashing at the bottom of the roof with tin snips. Otherwise dripping water will leave its mark along the siding. Install the first length of z flashing. When it comes to flashing siding corners many builders simply use a 1x wood corner.

The best solution is a preformed or custom bent kick out flashing to divert the water away from the siding. Start by making an outline on the siding where you want to position the ledger board. Slip flashing under siding. Where the step flashing terminates along a sidewall is a common trouble spot for moisture problems.

Inside corner w flashing. Snap a chalk line cut out the siding and tack up the ledger board. Cut a piece. Lay a shingle over the step flashing starting at the roof edge.

Therefore the upper piece of wrap or flashing should always overlap any lower pieces. Flashing helps prevent any moisture which can collect due to condensation or small gaps in the siding that flows downward from infiltrating behind the house wrap where it can do damage. The vertical flange of the flashing is to extend up behind the adjoining siding. Then slip flashing behind the siding covering the top edge of the ledger.

The large leg of the metal goes against the wall leaving the seat and face covering the top edge of the siding. If the shingle already has flashing on it the kickout flashing has to slip beneath it and you ll have to loosen or remove siding to do this. Many times builders fail to use proper flashing at the top of windows. It is used to protect the horizontal joints between sheets of siding from water infiltration.