How To Install Flashing Under Vinyl Siding

A flat level wall surface is necessary for proper installation of vinyl siding.

How to install flashing under vinyl siding.

You have to think about how roof shingles or feathers on a duck work to get a good understanding. Refer to important notes for more information on water resistive barriers. Use an old rag to remove any dirt or debris that may be there. Install undersill trim along the edge of the vinyl over the flashing at the top and bottom.

Nail it to the sidewall or glue it if nailing isn t possible. Using a pry bar you will need to remove a layer of siding from above the window that you want to install the drip cap on. Start fastening in the center of the panel and work toward the ends. How to install step flashing under siding 1.

Attach the flashing tape above the window and then slip the drip cap into the siding and attach to the tape. Center the fasteners in the slots to allow for expansion and contraction. Next comes another layer of building wrap installed like the first layer. Install the trim just under the drip cap.

Lay a shingle over the step flashing starting at the roof edge. Apply a bead of caulk to the felt and set the window in the caulk. Cut the drip cap to the correct size for your window. Nail j channel along both sides of the cutout.

Consult your local. When the vinyl siding rests on top of these boards a piece of flashing is needed to create a leak proof conversion between the first piece of vinyl siding and the horizontal fascia board. It is always recommended to install step flashing behind stucco dryvit wood panel lap siding vinyl siding cedar shingle siding etc. Then tack the ledger into place with 16d nails.

Place all other fasteners in the center of the slots. If the kick out and step flashing can t tuck behind the siding screw on cap flashing to cover it then caulk along the top. Start fastening vertical siding and corner posts in the top of the uppermost slots to hold them in position. Here s why the metal flashing is so important in your case.

Install flashing before starting to apply the siding. Cover with cap flashing. Slice along the bend line about 4 inches into the first piece of flashing at the bottom of the roof with tin snips. Next slide drip flashing behind the vinyl so the lip fits over the top of the ledger as shown at right.

Cut a piece. However in most instances step flashing should be installed behind siding. In certain instances flashing may need to be installed on the exterior of siding. At the top tuck metal drip cap flashing under the siding and on top of the second layer of wrap.

Lift the bottom shingle and slip in the kickout flashing.