Normally I like to do every last thing I can on my house. It saves money, and I just love the work. However, for the big job of replacing all the windows on my house, plus adding all new siding, I hired out the work to a trusted local contractor. But if you read on, you’ll find out how to choose the right materials and how to keep your contractor honest. You might even learn how to tackle the job yourself.
In an earlier blog, I installed a window in my garage, to give me a nice view and some natural light in my workshop space. So it bothered me a little to just watch the work this time! But it was a wise choice. My contractor has better ladders, more workers, and more know-how, and I just have too much work at the moment. That said, watching it happen, I realize that this is a job a lot of people could do.
In the milder climate of the Pacific Northwest, where I live, a lot of houses were built with just a single skin of exterior-grade plywood. No house wrap, and no siding. That’s the deal on the 1979 fixer-upper we bought in 2015. So adding windows is a little bit different than it is on a house with plywood sheathing plus siding. But not much.
Modern windows have a simple nailing flange all around the outside. You just sit the window in the rough opening, make sure it is level, and nail or screw that flange to the exterior walls. Done. In my case, we could simply nail that flange onto the plywood exterior, wrap everything with house wrap, nail trim boards around the windows, and then nail on our siding of choice, bumping it up against that trim.
For a house with existing siding, you would just need to work around that, cutting it back or removing some of it, or just pulling off the trim boards and replacing them afterward.
The problem on houses like mine is that those window flanges are nailed right onto the studs, and then the T1-11 exterior plywood goes on and covers them up. That meant we had to cut off a strip of that plywood around each window to access those flanges and remove the windows.
A word about choosing windows. We were getting rid of the worst possible windows, made of aluminum, another cheap signature of the era of disco and polyester. Terrible looks and terrible energy efficiency. The usual choice these days is vinyl windows, which used to be considered cheap but have gotten way better of late, with most offering the Energy Star rating. That said I went with Marvin’s Integrity windows, for a variety of good reasons. Made of a special type of fiberglass, they offer the best longterm value on the market.
Building experts agree that Marvin’s fiberglass is super-energy efficient and super durable, meaning it won’t warp or crack like vinyl sometimes does. Also, it expands and contracts very little, just like the glass inside the frames, meaning the seals all around that glass will not fail. And last, its mitered corners are crisp and clean-looking, unlike those melty miters on vinyl windows. Last the Marvin Integrity windows are available in a range of colors, applied in a thick fiberglass layer that promises a lifetime of service.
You could go even higher end, choosing windows clad with wood on the inside, but I’ve got plenty of wood inside my house, and I like the clean looks of the fiberglass interior.
Whichever windows you choose, the KEY to a good installation is making sure the windows are level and square, so they will operate smoothly, and then making sure the window is flashed correctly. Flashing is the overlapping layers of metal, plastic, or rubberized material that go all around the window, under your siding, to catch any water that gets under there, and send it down over the house wrap instead of letting it inside the window frame to cause rot and damage.
Anyway, check out the following pics to see the whole process. Next up will be applying the window trim and all the siding. I’ll do a whole blog to explain our choices on that.