Bi-Folding Exterior Doors and Lintels

2 Jul 2013
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United Kingdom
Trying to put a detailed design together for an extension I'm planning in the near future and I've come unstuck on finding a suitable lintel to support the opening for our desired door set.

We want bi-folding doors, nice set in B&Q that's 4205mm, but I cannot find any lintels long enough. Best I've found so far is a 3600mm steel cavity lintel at Travis Perkins.

These bi-folding doors are pretty common now, so I'm guessing there's a simple solution which I've missed. Can anyone help?

Thanks in advance.
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Its not so much about the couple of courses, but potential loads of the roof - however, if you call Catnic tech department they will be able to clarify for you straight away. Its a reasonably big span..

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