How To Properly Flash Windows And Doors

Flashing tape photo 6 is a thick pliable waterproof tape that goes under or over nailing window flanges sill and top flashing and house wrap.

How to properly flash windows and doors.

Drip caps are fastened to the sheathing directly above a window and protrude slightly to keep water from entering the window unit. Apply flashing tape over the nailing window flanges of the window sides draping it over the sill pan and behind the house wrap at the top. In a remodeling job apply self adhesive flashing strips in this order. Pull diagonal measurements off the jamb corners to square and plumb the jamb shimming the upper corners as needed.

The flashing needs to be integrated properly with the house wrap and siding for the system to work properly. Apply more flashing tape at the top. On the exterior the pan flashing should lap over the deck or masonry flashing below. Along the bottom then the sides then the top.

Then add small pieces of flashing over the gaps at the corners. Above the window opening cut a head flap. How to flash windows and doors. Then hold the window in place by nailing just the two corners of the top flange from the outside.

If your windows do not come with drip caps you can purchase them from your local supplier or fashion your own with aluminum coil and peel and stick flashing. Fold the side and bottom flaps into the window opening and secure. Drip caps with their windows. If forming a pan with peel and stick membrane carry it up the sides at least 6 inches and turn up the inside edge so it is held in place by the underlayment or finish flooring figure 3 27 above.

The flange must be sealed to the surrounding walls and flashed to shed water. Finish nails to straighten the side jamb. You could also slice through it with a. Cut the housewrap covering the rough opening in the shape of a modified i see figure 1.

Most new windows have an integral nailing flange either plastic or metal that is nailed to wall to secure the window in place. Cut a piece of 8 inch wide aluminum flashing to length using aviation snips. Fold it up to expose the sheathing and loosely tape it in place out of the way. How to install flashing around a window when you install a window in new construction the building wrap overlaps the self adhesive flashing.

Check the window s function then nail off the flange.