hi is there anyone who can give me some advice on putting in a rsj as ive just built a sunroom 4x4m and have a set of french doors in and want to open it right up with a 3.4m lintel its made from block and am taking one side out at a time i just want to make a line just bigger than the rsj and cut it out with sthil saw will i need to put some supports in as im doing one side at a time or not ??
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