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Old 08-24-2019, 07:04 PM   #1
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How Many Windows Will Fit.


Converting a screen porch into a "sun" room and want a lot of light on the front wall. Was planning on installing three 48" double-hung, but not sure there will be enough room between them for casing/trim/siding. The wall is 161" wide (outside) and carries the majority of the roof load. A 2x6(2) header runs its entire length. All of the framing below the header will be replaced. Will be using 4-stud corners at either end. How many windows (and what width) could be installed. Thanks.
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Old 08-24-2019, 07:25 PM   #2
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Re: How Many Windows Will Fit.


3 x 3'10" with 5 1/2" between them

3 x 4' with 2 1/2" between them

3 stud corners 3 x 4' with 4" between them

I have never done them with less than 3" between.
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Old 08-26-2019, 12:58 AM   #3
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Re: How Many Windows Will Fit.


How much loading does this "header" support?

Pictures would help - so we can see how wide the screened areas are now and get a sense of what load there is and what framing you want to remove.
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Old 08-26-2019, 10:33 AM   #4
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Re: How Many Windows Will Fit.


You can get windows mulled together, however with just a 2x6 header, you will probably need to break up the windows with posts (as Neal options) to shorten the spans of the 2x6. But there are also other things to consider like the roof/lateral loads and foundation support for this, as I'm sure this is just the first step towards making it a fully conditioned, permanent space.
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Old 08-27-2019, 05:21 PM   #5
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Re: How Many Windows Will Fit.


Quote:
Originally Posted by Nealtw View Post
3 x 3'10" with 5 1/2" between them

3 x 4' with 2 1/2" between them

3 stud corners 3 x 4' with 4" between them

I have never done them with less than 3" between.
Quote:
Originally Posted by 3onthetree View Post
You can get windows mulled together, however with just a 2x6 header, you will probably need to break up the windows with posts (as Neal options) to shorten the spans of the 2x6. But there are also other things to consider like the roof/lateral loads and foundation support for this, as I'm sure this is just the first step towards making it a fully conditioned, permanent space.
The 2x6 header was part of the original construction. I replaced it a couple years ago with the re-build. Based on that, I conclude that it will be strong enough to carry the load. My concern is, how many studs are needed below the header. Currently, there's a 4x4 at either end and in the middle, plus two 2x4s spaced about 24" between the 4x4s. Don't know if that is minimum or gross overkill. It was created for looks and screening.

I was thinking that two sets of three 2x4s spaced about 50 inches apart between the end studs would be enough to support the load, but I don't really know.

The foundation support is the existing 4" slab. It won't be conditioned unless I decide to install a wall-mounted ac/heat unit after a year or so. It's attached to the garage and can only be accessed from garage or outside, not from any other living area.
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Old 08-27-2019, 06:26 PM   #6
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Re: How Many Windows Will Fit.


Any snow load to speak of down there? If not, I think you will be fine.
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Old 09-20-2019, 06:55 PM   #7
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Re: How Many Windows Will Fit.


Quote:
Originally Posted by Nealtw View Post
3 x 3'10" with 5 1/2" between them .
Quote:
Originally Posted by Domo View Post
How much loading does this "header" support?
Quote:
Originally Posted by 3onthetree View Post
You can get windows mulled together, however
Unfortunately, the answer is 0. Current code requires a deeper foundation completely around the perimeter than the existing 6-in slab. Plus, the existing roof, which I planned to keep, has to be above the garage top plate instead of attached to the house like a deck. So, on to plan B.
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Old 09-20-2019, 11:12 PM   #8
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Re: How Many Windows Will Fit.


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Originally Posted by LarryJ-nova View Post
Unfortunately, the answer is 0. Current code requires a deeper foundation completely around the perimeter than the existing 6-in slab. Plus, the existing roof, which I planned to keep, has to be above the garage top plate instead of attached to the house like a deck. So, on to plan B.

That might be doable with out ripping it down.
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Old 09-21-2019, 03:38 AM   #9
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Re: How Many Windows Will Fit.


Which one is it.?

"" Unfortunately, the answer is 0. Current code requires a deeper foundation completely around the perimeter than the existing 6-in slab.""

"" The foundation support is the existing 4" slab.""
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Old 09-21-2019, 09:57 AM   #10
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Re: How Many Windows Will Fit.


The porch, with any other load will need a perimeter footing, not just a 4" slab. Here, we are required to pour a continuous footing, rather than sonotubes since much of our construction is on mountain sides.

I would not install individual windows without 5 1/2" between to accommodate 2 1/2" trim molding around the perimeter of all the windows. Pictures will certainly help.
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Old 09-21-2019, 12:09 PM   #11
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Re: How Many Windows Will Fit.


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Originally Posted by Nealtw View Post
That might be doable with out ripping it down.
Please elaborate. Not sure how a perimeter footing could be installed under existing slab without cutting the perimeter and re-pouring. Also, the roof beams would have to be replaced with longer ones to raise it above the top plate and tie into house roof. This work would significantly increases budget for this project. Not worth it for a room off the garage.
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Old 09-21-2019, 12:11 PM   #12
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Re: How Many Windows Will Fit.


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Originally Posted by chandler48 View Post
The porch, with any other load will need a perimeter footing, not just a 4" slab. Here, we are required to pour a continuous footing, rather than sonotubes since much of our construction is on mountain sides.
Yes, that's what my City told me, as I mentioned in the post above.
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Old 09-21-2019, 12:26 PM   #13
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Re: How Many Windows Will Fit.


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Please elaborate. Not sure how a perimeter footing could be installed under existing slab without cutting the perimeter and re-pouring. Also, the roof beams would have to be replaced with longer ones to raise it above the top plate and tie into house roof. This work would significantly increases budget for this project. Not worth it for a room off the garage.
You would under pin the concrete, usually done 4 ft at a time but you could build a temp wall inside and do it all in one pour. Likely 12 to 24 inches below ground level to the bottom.



For the roof You build a temp wall inside and cut it loose from the house jack it up changing the angle and lay in new rafters that will sit on the wall and then drop the old roof on top of that and nail old rafters to new.



That is the quick way of saying it, there would be a few more details to worry about.
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