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How to install Basement Windows on a Block wall?

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Oct 04, 2013, 10:05 AM
How to install Basement Windows on a Block wall?
So I need to replace our ancient windows in our basement. We have a block wall with the cut out for the windows at the top. The top edge of the widow is against the wood base of the walls.

Most windows I see have the Flange part that sticks out around the window like you'd use on a regular wall. DO they make specific windows for basements with block walls that don't have that piece or do I need to somehow just cut it off?

I checked all the websites for the normal Big Box stores and none of them seem to have that type except in Hopper style which we don't want. We prefer sliding or ones that open from the bottom.
Oct 05, 2013, 12:54 AM
Using the groove in the block to hold the window is a one-time only thing for the original windows. Likely you'll have to destroy the old frames to get them out. Then install replacement windows that are sized either for the existing masonry opening or a new RO created by installing a wood perimeter within the masonry opening.

You can probably find what you need at a big box store on a special order or go to a place like .

Oct 06, 2013, 05:35 PM
Pressure treated wood is what I used at my abode. Not that it is considered wet but it does come in contact with concrete.

Popeye only reached for the Spinach can as a last resort...
Oct 06, 2013, 07:15 PM
If you don't need the ventilation you can fill it in with glass block. That will make it much more thermally friendly and still let in light.

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Any advice given here is general in nature and is not necessarily valid for your given area. If in doubt check with your local codes enforcement department for what is required when doing electrical, plumbing or structural work on your house. Permits may or may not be required in your area and home owners may not be able to DIY some tasks. I have no way of knowing if you have the skills needed to complete the tasks you are asking about, when in doubt seek professional assistance.

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