I have a corrugated metal shed which i want to fit a pvc window. I am not so sure how should i approach to this. The shed looks like the one pictured below but there are 2 vertical perimeter channels on the gable end ( Same as the side walls in the picture)
I know these bars wont carry the load of the window alone so i need to build some sort of a supporting timber frame but i need some advice on this since the gable end of the shed usually takes some strong winds and a lot of rain.
Also, whats the best way to water proof groove shape of the metal sheeting? expanding foam?
groove depth is 32 mm on the sheets and the supporting horizontal perimeter channel behind is 35 mm Upvc window is 70mm thick with 60mm slot at the bottom
Here is crappy thing i drew on ms paint which might be useful :) grooves are actually running vertical, so not like the drawing