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Old 13th October 2010, 08:58 AM   #1
mikeyb50
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Join Date: Aug 2008
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Red face Beam span mid supports

Hi
I recently done calcs for a loft conversion hip to gable, and calculated a beam supporting the front slope roof from party wall to new gable. The beam was a 203 x 203 x 71 UC at 7.4m span. The builder used a 203 x 203 x 46 UC which when building control say failed, I have put it into superbeam and yes it does fail. Rather than replace the beam there is a load bearing wall at 3.5m from ground to first floor solid blockwork. If I build up to the underside of the 203 x 203x 46 beam could I then theorectically add to new beam calcs from 0 -3.5 (3.5 span)the loadbearing wall and then 3.5 to 7.4 (2.9 span) the new gable. So if I show 2 new beam calcs and delete the 7.4m 203 x 203x 46, with the 2no. beams each being 203x203x46 UC

This way the 7.4 beam that is in place will not have to be removed. Is this possible to do or is there another way you can recommend it.
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Old 13th October 2010, 12:19 PM   #2
Tony Bryer
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Default Re: Beam span mid supports

What you're proposing sounds fine subject to the wall in question actually being a loadbearing wall. If you've not already done so, I would check the finished thickness at a door opening - I would expect 120-130mm if lb - also if the first floor joists run in the same direction as this wall get the builder to remove a floorboard at FF level and ensure that the wall runs through and is not built off the floorboards offset to the wall below - not uncommon on the patch where I was once a BCO.

Assuming you and the BCO are satisfied as to the loadbearing capacity you will need to design a suitable bearing under the beam so as to disperse the load.
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Old 13th October 2010, 01:27 PM   #3
mikeyb50
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Wink Re: Beam span mid supports

Thankyou Tony
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