Measuring for replacement vinyl windows

[Al]

Hi, I am measuring for replacement windows and the internet is contradictory on this, I have the interior trim off and I am going to measure the outside edge of the Jambs (the exposed wooden box the window sits in) side to side and top to bottom. is this right? Thanks

[Brian V]

Yes, in 3 different places. Width: top, middle and bottom Height: left, middle and right

Use your highest measurement, also make sure you make your vertical measurement from directly inside the sill. Best device to use is a carpenters rule with the 8" slide on one end. Standard tapes can cause you to be off sometimes up to 1/4". The manufacturers take your measurements and subract either 1/8, 1/4 or even 1/2 so you need to be as close as possible.

example: Width: (top)=32, (middle)=32 1/8, (bottom)=32 1/4 Hieght: (left side)=51 1/8, (middle)=51 1/4, (right side)=51 1/8

Your replacement window would be 32 1/4 x 51 1/4

Good luck!

-Brian

[wayne]

Measure outside too. My house the outside was smaller than inside and they could not get windows all the way in so I lost half my window sill. May have been because of siding but I would check for sure and you want to use the smallest measurement measure middle too!

Wayne