How is the BEST way to measure for replacement windows?

Question

I need to replace my old wooden windows... to vinyl replacement windows.

How do I measure them, without calling a professional?

Please be precise, thank you.

Answer 1

take the molding off and measure in between the 2X4's or measure the window once you take the widow out

Answer 2

I will try to explain it as best as I can.
1. Measure the width from the inside of the frame to inside frame and subtract 3/4" to 1". Do not measure from the trim pieces holding the windows in place because these trim pieces have to be removed before installing the new vinyl replacement window.

2. Measure the height from the inside of the top frame (not the trim piece) to the top of the window sill or top side of the bottom frame. Again subtract 3/4" to 1"

3. Example Width 36" order 35 1/4" or 35
Example Height 48" order 47 1/4" or 47

4. Always measure from corner to corner on both sides as well, to make sure the window opening is square or you can use a level.

The reason for the subtraction of 3/4" or 1"is to allow the space to spray foam insulation around the new vinyl windows which is the best form of insulation or you can use batt insulation, but I recommend Low Expansion Spray Foam

If you have any questions email me [e-mail]

Answer 3

ticket had the better answer
measure the width and subtract 1/2" For the height subtract 3/4". try to get measurement with the window open so you know how deep the window closes. If you look at your windows you will see the wooden divider between the sashes and also one that acts as a stop for the back window sash. That back stop will stay in and the new vinyl window will push against that. I caulk that stop b4 installing the window-that way the window will have a good seal. you will also have to take out the rope pullies or smash them into the sides so the window passes them.

Answer 4

I have an easier way. If you have double hung Windows. These are the kind where the top and bottom slide open. You measure the width between the track where the windows slide. Then measure the height from inside of the sil (where the bottom of the lower sash touches to the top inside where the upper sash touches. Subtract 1/4" from each measurement. Then when you get your replacement window you will remove the nailing fin from the window. Then you will take off the outer stop on the old window and remove the lower sash. Then remove the parting bead and remove the upper sash. Fill in the weight pockets or spring holes with insulation. Then put a bead of caulking around the outer edge of the window and put it into the opening of the old window from the inside. Shim and put some screws in. Fill the gap between the sil and the vinyl window with some insulation and cover it with trim available from who you get your windows from. Put the inside stops back in. Caulk around the window inside and out. Two if us did 24 windows in one day this way. You don't have to mess with the inside or outside trim this way.

Answer 5

well the measurement you want is the 'rough opening' once the sliding window and the stops are out, whats left is your rough opening and the windows ordered will fit into that wooden opening.
when ordering select either tip to tip, means exact or go with the mfg return measurements which are usually 1/2'' inch smaller all around so it will fit easily.

If you need nail-on fins, request that or box frame so you insert and screw in the sides to hold it in.
Nail-on's nail from the fin outside and then you stucco or trim over them.
depends on the look.

Answer 6

Check with the people who will be providing the windows, I think most go from the sill to the top of where the window seats and they measure from track to track for the sides.
The window people will usually come out and give you a measurement just to be sure they make the right size.

Answer 7

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Answer 8

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Answer 9

Crash has the best answer. I am a contractor and have gone through window installation courses.

Answer 10

yes, crash is correct, but i might add 1 thing. be doubly sure that the foam you use IS LOW EXPANSION FOAM>