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bdcjo4 07-18-2011 10:13 AM

New window in walk-out basement wall
 
Hello, We are adding a bedroom to our basement and would like to install a new window in cinder block. the window is 48x36 slider, new construction. So a couple of questions.

1. After cutting the hole in cinder block we will have the rough opening approx. 51.5x39.50. Does that sound right for 2x8" treated lumber?
2. How do we attach the treated lumber to the cinder block? What is a lintel and do we need one?
3. Do we insulate with expandable foam or caulk?
4. How do we finish the exterior, cinder block walls, and interior of window.
5. Is there a video on this somewhere?

Thank you,

BDCJO4

AGWhitehouse 07-18-2011 11:35 AM

1. After cutting the hole in cinder block we will have the rough opening approx. 51.5x39.50. Does that sound right for 2x8" treated lumber? 2x8 lumber sounds correct for an 8" nominal block. You should find the rough opening dimension for the window. Add 3" to each dimension and that is the Masonry opening you will need.

2. How do we attach the treated lumber to the cinder block? What is a lintel and do we need one? For best results you should be toothing in block where you have to saw cut and grout filling the cells the best you can. Then you can use any standard masonry fastener to attach the blocking. Yes you will need either a masonry lintel or a framed wood header depending on your application within the wall (i.e. if the masonry is only 1 course over the window, then a wood header would be sufficient.)
If the wood header is your route then you might consider making load bearing wood jambs to eliminate the need for excessive block repair and grouting.

3. Do we insulate with expandable foam or caulk? If you mean between the window and wood framing, then expandable foam (made for windows and doors).

4. How do we finish the exterior, cinder block walls, and interior of window. To match the existing conditions unless alternative finishes are desired.

5. Is there a video on this somewhere? Do a youtube and/or google search


concretemasonry 07-18-2011 01:32 PM

Before you go to all the trouble, find out if the new bedroom needs a egress window that has different dimensions and specific requirements for the height of the bottom of the clear window opening. These may not be required now for your aerea, but in many ways, they are not "grandfathered" since are safety and occupancy item, not like building code requirements.

It is good to think ahead since when you go to sell a buyer home inspector might catch a non-conforming window or worse yet, the areas could be classified as not a part of the living area and the amount of money for financing could eliminate many buyers unless they have a good cash downpayment.

Just a heads-up for consideration, even though you say the basement is a walk-out (I assume this is acessesible through the walk out to serve the entire basement area, but you never know).

Dick


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