Hi I am researching putting a 900mm exterior door into bungalow supporting wall. Got lots of info on planning regulations and the use of Acro's etc but not much on the Lintels. Do I need an expensive RSJ or will some ordinary 70mm square steel box section do?
Chris
You need a suitable lintel, Catnic or similar, 1200mm long to give 150mm bearing either end. Ordinary steel box section is likely to rust over time giving major problems.
Chris
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