Just a question: I'm still confused about rough opening. I've seen conflicting information about it. I keep seeing people on other sites mention a "sash". What is a sash? And what is considered the frame? Is it basically the framing around the window to hold it in place? I have an old metal window that is set in to a wood wall. There is no trim around the window-- so when I measure the opening (basically the whole cutout size in the finished wall) I get approximately 22.75" x 34.75". Is that the rough opening, or would the rough opening be determined if I looked at the outside dimensions of the wood surrounding the window?
+my cats a rough opening is this. If you have a hole in your wall for window that is the RO. It's the size of the opening after framing OR in its framed state. Maybe double check in your local area as terminology may differ. I believe the outside dimensions of the window it's self is called OSM? That the size of the frame but you need your RO slightly bigger to allow for shimming and insulation and to make sure it fits as framing isn't always 100% square and true. Hope that helps.
We are building our ICF home soon and we are about to order windows and doors , there is windows and doors measurement on the plan , so should I add 3/4 to these measurements when ordering the windows? Thank you
Great question! I’m glad you asked. Every window company will have different sizes. It’s ideal to get a quote, choose your company and base your opening off their schedule.
Why not go 3/4 instead of 3/8th around the window ? Gives an error margin. A lot of people seem to add this kind of spare capacity. I think there has to be some kind of range for this sort of thing, instead of a rigid value
why 3/8" can you explain this process...I have seen other videos where for instance if the rough opening is " (5'-0") then we add three inches which makes it 65 inches. can you explain this
Haha. 3/8 + 3/8 = 6/8.... Simplified is 3/4 So build your RO 3/4" wider and 3/4" taller, and you will have 3/8" all around your window when it is in place.
This is good - you could moonlight as a math teacher! thanks for posting.
Thank you! 👌🏽
Just a question: I'm still confused about rough opening. I've seen conflicting information about it. I keep seeing people on other sites mention a "sash". What is a sash? And what is considered the frame? Is it basically the framing around the window to hold it in place? I have an old metal window that is set in to a wood wall. There is no trim around the window-- so when I measure the opening (basically the whole cutout size in the finished wall) I get approximately 22.75" x 34.75". Is that the rough opening, or would the rough opening be determined if I looked at the outside dimensions of the wood surrounding the window?
+my cats a rough opening is this. If you have a hole in your wall for window that is the RO. It's the size of the opening after framing OR in its framed state. Maybe double check in your local area as terminology may differ. I believe the outside dimensions of the window it's self is called OSM? That the size of the frame but you need your RO slightly bigger to allow for shimming and insulation and to make sure it fits as framing isn't always 100% square and true. Hope that helps.
Yes. That helps. Thank you.
We are building our ICF home soon and we are about to order windows and doors , there is windows and doors measurement on the plan , so should I add 3/4 to these measurements when ordering the windows? Thank you
Great question! I’m glad you asked. Every window company will have different sizes. It’s ideal to get a quote, choose your company and base your opening off their schedule.
Why not go 3/4 instead of 3/8th around the window ? Gives an error margin. A lot of people seem to add this kind of spare capacity. I think there has to be some kind of range for this sort of thing, instead of a rigid value
I think I missed the point. I have never ordered a 59" window. I have ordered a 5ft or 60 inch.
why 3/8" can you explain this process...I have seen other videos where for instance if the rough opening is " (5'-0") then we add three inches which makes it 65 inches. can you explain this
That’s 3/4 times 4 lol
Nice explanation, but why use imperial measurement? Very confusing.
Those are called “freedom units” here in the US
Haha. 3/8 + 3/8 = 6/8.... Simplified is 3/4
So build your RO 3/4" wider and 3/4" taller, and you will have 3/8" all around your window when it is in place.
@rossbeebe8162 Of course! Just trying to explain it in depth so beginners can understand
I like that!