![]() On the sides of the window, flashing tape can be lapped up by 1/4 inch on the casing to keep water out. If you’re re-siding a garage or outbuilding with old wood window frames, and no nailing fins, just follow the same basic procedures as you would with a modern window. But it’s certainly possible to come across a wood window in pretty good condition, where tearing it out doesn’t make sense. It’s been decades since wood windows were used where Taylor lives, and when he does come across them they are typically in such poor condition that they must be replaced. Most if not all windows now come with nailing fins, but in older homes windows may not have them. This is essentially the same approach as in new construction. If a strip of WRB can be worked under the nailing fin at the bottom of the window it can be lapped (but not taped) over the WRB on the house. The membrane can be folded against the interior trim to form a small end dam and the window re-secured.” “It’s often possible to slip that into place by removing all the fasteners from the flanges except at the head and slightly tilting the window out. “My feeling is that a sloped sill isn’t half as important as the presence of a waterproof membrane,” he said in an email. ![]() He had some advice for dealing with this tricky area. Malcolm Taylor, a builder on Vancouver Island, is used to dealing with rainy conditions and has repaired plenty of rot. But the use of a waterproof membrane at the bottom of the window still is a good idea. When you’re dealing with a window that’s already installed, you don’t have the luxury of sloping the bottom of the rough opening. This weather lap prevents water from getting behind the WRB where it could do some damage. At the bottom of the window, a strip of housewrap folds out and over the water-resistive barrier on the house. A strip of WRB under the bottom nailing flange, applied before the window is installed, can be pulled out and allowed to drape over the WRB on the house, as shown in this instructional video from DuPont and in the illustration below. In new construction, a piece of beveled siding would be applied to the bottom of the rough opening (fat edge inward) to make a sloped surface that sheds water. This is not sealed with flashing tape, and the reason is that any water that gets past all of the defenses you’ve just established should have a way out. The bottom of the window is another story. So, think like a drop of water and make sure the layers are in the right order. If the WRB is tucked behind the head flashing, water can find its way behind all of the layers you’ve applied. The key is applying the different layers so water that gets behind the siding is directed outward by gravity. Be sure to layer materials in the right order so water so no seam faces uphill. Start with flashing tape on the sides of the window, then do the top. The last step is to fold the WRB down so it covers these layers. Then add another strip of flashing tape to seal the top of the cap flashing. This is followed by cap flashing that covers the head casing (Arnold beds the cap flashing in a bead of sealant). This tape should cover the top of the tape at the sides of the window, and it should lap onto the top of the window frame slightly. Apply a strip of flashing tape over the nailing flange to seal the flange to the sheathing. Make an angled cut at each upper corner of the window and fold the WRB up and out of the way. Pressure-sensitive tape should be rolled out with a J-roller. Arnold recommends the tape lap up the side of the window frame slightly-about 1/4 inch or so-to protect the vulnerable seam between the window frame and the nailing flange. ![]() The tape should extend several inches above the top of the window frame, and several inches below the bottom of the window frame. Start with the sides of the window by applying flashing tape over the nail flanges. When you’re flashing a window that’s already in place, the same fundamentals apply. Pan Flashing Choices for Windows and Doorsįlashing the Jambs of Pre-Cased Windows and DoorsĮxtra Protection for Head Flashing on Windows and Doors ![]()
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