How To Flash Into Vinyl Siding

You want to make sure you are sloping the cap away from the window so that any water will run off.

How to flash into vinyl siding. Consult your local building code for requirements in your geographic area. Install undersill trim along the edge of the vinyl over the flashing at the top and bottom. Unless already installed a water resistive barrier should be applied to the house prior to installing vinyl siding. Attach the flashing tape above the window and then slip the drip cap into the siding and attach to the tape.

However in most instances step flashing should be installed behind siding. Nail j channel for vinyl or metal siding onto the flashing. Cut the drip cap to the correct size for your window. Now any water that runs inside the j channels will come out on top of the siding and out the weep holes designed for this purpose.

Install siding on the walls down to the flashing. Next slide drip flashing behind the vinyl so the lip fits over the top of the ledger as shown at right. Cut a piece of flashing out of felt paper and install it at the bottom corners of the windows before you install the side j channels. Using a hammer nail the cap into the siding.

Leave a 1 4 inch gap between the step flashing and wood siding or cement board. A flat level wall surface is necessary for proper installation of vinyl siding. When it comes to flashing siding corners many builders simply use a 1x wood corner. Diy how to fix loose vinyl siding with a malco sideswiper siding tool.

Nail j channel along both sides of the cutout. Refer to important notes for more information on water resistive barriers. Overlap the flashing onto the row of siding just below the window. Then tack the ledger into place with 16d nails.

Inside corner w flashing. Install flashing before starting to apply the siding. Here are four ways to use metal flashing to prolong the life of siding. In certain instances flashing may need to be installed on the exterior of siding.