Installing leak proof windows and doors

[John Raabe]

This is an extensive article from Joe Lstiburek of Building Science on how housewraps can leak and how to keep this water outside the house. Joe has been evolving this science for over 30 years. Click: http://goo.gl/ccE8L.

The most relevant part of the article is near the bottom where there are step-by-step diagrams of how to fold, wrap and seal an opening in order that it will move any water getting between the house wrap and the sheathing to the outside where it can drain.



A) Install a piece of beveled wood siding in frame wall opening at sill to create slope; (B) "I" cut in housewrap; (C) Fold housewrap in at jambs and sill; housewrap at head temporarily folded up; (D) Install formable flashing at sill; (E) Install sealant bead at head and jambs; install window plumb, level and square; (F) Install flashing tape at jambs; (G) Install flashing tape at head; (H) Fold housewrap down at head; tape in place with sheathing tape; (I) Interior view prior to window installation; (J) Interior view after window installation; (K) Air seal window around entire perimeter on interior with sealant and sealant backer rod.