I’m a Canadian who has lived in southern Japan for 11 years, and learned carpentry over here from a Japanese 2×4 carpenter. Now I sell/build homes here. Many builders are using rainscreens here now. The company I do finish carpentry work for uses 3/4″ furring strips on plywood, then 1/2″ siding of some sort on top of that. The windows (usually vinyl), are installed before the furring strips, with caulking and bitumous membrane tape (4″ wide). I always double tape the bottom and the corners. Here is my question: 1. The windows don’t have that much frame on the outside, so the windows almost end up being sunk into the house, meaning the siding sticks out further than the windows frames do. Is it safe for me to install the windows on top of furring strips so the total thickness of the window frame will be greater than the siding plus furring strips? Do builders in North America add exterior jamb liners of some sort? I’d love some tips on this.
Thanks
Replies
Not sure what you mean by rainscreen, but we call it a three season porch and we build redwood jambs and mount storm windows to a stop. The jambs protrude beyond the siding for a caulking edge or can be held flush and use brick mold like any other window. The interior is flush with whatever wall treatment and is cased like normal. Yes we slope the bottom sill.
Last summer I built jamb extensions out of WRC and like you mentioned, tilted the bottom sill for good water drainage. The painters did 3 coats, but the paint manufacturer here still would not warranty it in that application. Next time I may look for some polyurethane material.
I have seen some folks do this by furring around the entire perimeter of each window opening such that the window flanges are set on the furring instead of the sheathing. Probably easier than jamb extensions.
yes...
fur out the r.o. ,then put the membrane over...
I like to put a 45 degree edge on the furring out stock ,so the
membrane does not "tent" when it returns to the wall/building paper...
I'd only add: And order the appropriate length INTERIOR jamb-extensions to compensate
Did you mean "appropriate width interior jamb....."?
your right....
probably drywall returns anywhos
No, I meant "appropriate DEPTH interior jamb extension"
;-P