Hello
My SE has specified a 178x102 UB 19 for a one-wall knock through. Span is 203cm. I asked him about increasing the span slightly; he came back and said this beam was good for 250cm.
He also said that it made no difference whether the beam was flushed or butted to the joists as he had assumed the compression flange was unrestrained.
I'm wondering if this means the beam is over-specified and I might be able to get him to try something smaller? What's your view? I ask because I have 6" ceiling joists so a 152x89 UB 16 could be set flush in the ceiling.
Would you also expect to have to pay extra for him having "another go", so to speak?
Finally, can you give a rough idea of the extra cost to flushing in the beam? I was thinking about £350: an extra days' labour for cutting and fixing timbers (£200), extra costs for a drilled beam (£50), timber ledgers, bolts and 10 joist hangars (£80), extra props since you would have to prop both sides (£20).
Thanks
bsr
My SE has specified a 178x102 UB 19 for a one-wall knock through. Span is 203cm. I asked him about increasing the span slightly; he came back and said this beam was good for 250cm.
He also said that it made no difference whether the beam was flushed or butted to the joists as he had assumed the compression flange was unrestrained.
I'm wondering if this means the beam is over-specified and I might be able to get him to try something smaller? What's your view? I ask because I have 6" ceiling joists so a 152x89 UB 16 could be set flush in the ceiling.
Would you also expect to have to pay extra for him having "another go", so to speak?
Finally, can you give a rough idea of the extra cost to flushing in the beam? I was thinking about £350: an extra days' labour for cutting and fixing timbers (£200), extra costs for a drilled beam (£50), timber ledgers, bolts and 10 joist hangars (£80), extra props since you would have to prop both sides (£20).
Thanks
bsr