I have three glass block basement windows that I want to replace. My question is about the steps once I knock the blocks out. Do I build a frame in the opening with 1X2s and then screw the window into this frame? I am assuming I then caulk the inside and outside, and then install capping outside. The other question is can I buy the capping ready made and install it myself? Am I even close here?

Thanks.

 

FIRST find out what size windows you can get within budget (i.e. not custom sized if possible). Then figure out how big your opening is. Now figure out what size framing will work best and give you about 1/2 slack all the way around. I wouldn't use 2x2, but 1x4 or 2x4. Use pressure treated lumber or it will rot. Attatch with the blue screws made for concrete that come with their own drill bit.

You might be better off with a "new construction" type window with a nailing flange that you could nail on the outside to your 2x4 frame. (if you need a 1x4 frame, the flange will be too wide). Finally trim the inside and outside of your new window.

 

Depending on the wall thickness, for a standard cinder block wall I've always used PT 2x8's for rough framing and Tapcons/Adhesive to secure to frame to wall. Personally I do not like using new construct type windows in basements, especially when retro fitting as it adds to more work trying to cover up the nailing fin and finishing that off. As always, EVERY case is different and I deal with accordingly for the best solution, but I prefer to order my windows to fit a frame that I will build and install the outside stops on and cap for a nice finished look, plus I'm in and out.