The frame will crack or the glass will break when the window sags. I recently went to look at a new house. I opened a casement window but was unable to close it. The window no longer suited the frame because it had sagged. This was a brand-new product! I had hoped to reinstall the window, but after speaking with the Manufacturer’s Representative, I discovered that it could not be saved and would have to be replaced. Since they didn’t want to lose the Builder as a client, the Manufacturer offered the window at no cost to him. If widows are not properly mounted, they may fail prematurely, depending on how poorly they were installed. Have a look at this site.
As I previously said, I can’t possibly cover anything in the 114-page CSA A440.4-07 text. I’ll do my best to narrow it down. The majority of windows are vinyl, the majority of windows are sliders, and the majority of window replacements are full tear outs rather than being mounted within the original frame. This should be pretty easy to handle. Don’t try to extrapolate between different materials and window styles because there are variations.Windows with nailing fins are available from manufacturers. These nailing fins are widely used to secure a window that has no other protection. This is incorrect, as I explained in a previous post. CSA A440.4-07 is an incredibly valuable text. This is the proper way to mount a window. I’m not going to try to cover anything in this article because it’s 114 pages long. Is the Building Code requiring it? Yes, at least in Alberta, and I’m sure in.