Working on house made of block walls, approximately 5.25" thick. There are presently single pane windows mounted in metal frames installed throughout the house. I would like to remove these windows and install double pane insultated windows.
I was thinking of removing the current windows and using framing each opening with 2x6 lumber. Hopefully, this will allow me to obtain a "standard" size opening for the the replacement window and give me something to easily attach the window to. What would you recommend for installation of the wood frames to the block walls?
At present the window openings are: (approx. will get better measurements prior to window purchase)
71" wide x 38" high
48" wide x 26" high
40" wide x 26" high
40" wide x 39" high
46" wide x 38" high
Any other recommendations on installation, all ideas will be considered?

 

Full thick brick construction(all brick or brick/block) or veneer brick??? If full thick wall, windows were set into the walls at construction, if veneer, they are nailed to the framing. I often use the old frames(remove sashes) as a buck for the new windows. Vinyl windows can be ordered to 1/4" of the opening, no need for "standard" sizes.

 

This is a block constructed house. The walls are entirely made of what I am assuming to be the smaller sized cinder block type blocks?!?!? The metal frame windows are the old heavy "L" frames, with single pane windows which swing out to open.
I guess I could cut the enterior grids out of them and use the perimeter frame to attach the new window to...... what do you think?
I am just more used to working on wood framed houses, so thought by framing the windows in I could at least get back to wood framing. But if I can get a good seal using the above method, it would save some time and money.