On Tue, 07 Aug 2007 07:21:59 -0700 Chris wrote :
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?

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.

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Tony Bryer SDA UK 'Software to build on' http://www.sda.co.uk