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Hope u all had a wonderful Christmas.

1976 double wide Glenbrook. Current windows are old aluminum flange mount. I am going to replace them with single hung flange mount vinyl. It has T1-11 siding and the current windows are mounted on the outside of the siding where you can see the flange and the screws.

Should I mount the new windows with flange outside siding like existing windows are and put some trim on to hide flange or should I put them under the siding?

If under the siding do I pull all the siding from around window off or can I cut enough off to fit window and put some type of trim around window?

These are double pane insulated windows? If not I would not install them since you will not gain anything.
Install the flange against the siding otherwise you will have leaks. You can hide the flange with 1x3 wood trim

Greg

Yes they are double pain insulated windows.

thanks for the help