Window installation with traditional sill
Hi,
i am going to be replacing my old windows in a Cape style house. The current windows are original wood windowns with an incorporated exterior sill (photo). The new windows will be vinyl, probably Anderson and I want to maintain the same traditional look with the exterior sill. The first one to be done as my learning window is a garage window that is severely rotted (photo). To maintain the sill, do I mill a sill, install that and then install the window on the new sill? Is there another technique?
My plan is to remove everything down to the rough opening along with enough shingles to be able to apply flashing membrane. Because of the age of the house it is not wrapped. Make any adjustments to the opening so that it is plumb and level, apply a membrane to make the sill pan, install the finished sill (if that is the way to add the exterior sill)………I just realized a problem with that. If I install the sill, then the ends of the sill will be in the way when I install the window and run the flashing membrane down the sides. So, what is the correct way to add the exterior sill?
Last question, is replacing a picture window like the one in the photo any different, or is it the same installation and flashing process, just on a larger scale? Any special flashing consideration given the windows in the photo are three separate units?
Replies
Well, here is what I did ...
I installed aluminum clad windows. They have a nailing flange like all or most plastic windows.
I installed them per instructions. I then milled a sill with the same angle (15 degrees) as the sill on the window. Your windows likely don't have such a angle, but I would say never mind. Now my "sills" were only about 2 inches wide. I nailed up side trim and head trime. They were 5 quarter cedar at 3 1/2" wide. Then I took the apron and beveled the top edge at teh 15 degree angle. Then used casing nails and nailed the sill to the beveled top edge of teh apron. Then nailed teh assembly to teh wall below the window.
Pretty simple.
Oh and if you have ears on your sill you have to fidddle fart around to notch it to lap your siding or notch siding around the ears which ever your order work requires.
I think it added a lot of interest to the window trim.