HomeReplacementWindows.net

Replacement windows in block wall?

I am replacing windows in my basement. The old ones are single pane old metal set in the mortar. I'm going to use diamond blade to cut the mortar to get the old windows out and then use pressure treated lumber to build a frame for vinyl replacement windows. Any other suggestions? I've done replacement windows, but this is the first time for replacement windows in block. Thanks

Public Comments

1. No...it's a huge "pane" in the butt (sorry) but you're goin' about it the right way.

   Option "B" is to tear up the masonry to get the window frame fins out.



2. I'm not an expert but it sounds like a good plan. I would make 2 more suggestions. 1. paint your pressure-treated wood on all sides and joints (all 6 of them!) to help seal it off from the moisture, using a water resistant primer and paint, BEFORE installing the wood. 2. securely attach the wood to the cinder block with long lag screws or other bolts to make it more secure from an intruder (you want to make it as hard as possible for someone to just kick in the window).


3. If those old windows were done properly they are setting in a slot in the blocks on each side and then mortared in. When you cut the mortar if you can- you will find the Window frame still locked in to the block by the slot.

   This is a big job for little gain- you must also consider that adding wood to the side will reduce the opening and no standard size window will fit, that means a special order window- higher cost



4. This sounds dangerous to me. You're risking leaks for both water and cold air. I'd go to Lowe's or Home Depot and talk to the "window folks". Then if thats not satisfactory call a custom design vinyl window manufacturer in your area. There's got to be one or two. Basement windows are usually of standard size so to try to do Mr. Fix it yourself stuff is a sort of wasted effort I feel. Good Luck Stew


5. Depending on the replacement window construction, you may be able to attach the window directly into the block using tapcon screws (I assume this was what you were going to attach the wood to the block with anyway). The new windows must be able to be installed by attaching through the frame. It would have a flashing kit to cover the openings after installation. As usual, you would need to add insulation between the window frame and the block and caulk the open areas.