In article ,
Michael Chare wrote:
When installing plastic door frames and windows frames would you put a
concrete screw going up into the lintel?

No real need - and you want to avoid distorting the frame.

Best to lay it on a level bed, and fix to the sides. The foam etc infill
provides the strength.

--
*Marriage changes passion - suddenly you're in bed with a relative*

Dave Plowman London SW
To e-mail, change noise into sound.