Replacement Lintel Questions

[V8RX7]

I have opened up two doorways to become 1200 corridors.

1) Was an outside wall with a 50mm cavity - whilst I could use 2 conc lintels the one side is supporting flat roof timbers and I don't want a step in the ceiling.

Can I use a std 100mm cavity lintel and notch 50mm out the timber meaning it's only supporting 2" not 4" (joist hangars only support 2")

2)Is a 4" wall but is supporting flat roof timbers on both sides - again I'd like a flat ceiling so can I use a T shape lintel ? The issue being that they are designed to be on an 8" wall not 4"

I'm confident both suggestions will work but I don't want the Building Regs Inspector complaining
(I don't want to ask him until I know all the options)

[wseed]

I'm in now way qualified to answer your question but can you not just get a catnic for the 50mm cavity you have. I know when I was extending I had to buy different ones for what was left of the old house and the new.

Edited by wseed on Thursday 18th September 00:41

[TA14]

Sketches would be really helpfull.

AIUI you could solve 2) by putting in a 6" x 4" horizontally and wrapping joist hangers around it to pick up the roof joists.

[V8RX7]

wseed said:

I'm in now way qualified to answer your question but can you not just get a catnic for the 50mm cavity you have. I know when I was extending I had to by different ones for what was left of the old house and the new.

I'd looked in various merchants and hadn't seen any - just asked and one is on order - Thanks

[V8RX7]

TA14 said:

Sketches would be really helpfull.

AIUI you could solve 2) by putting in a 6" x 4" horizontally and wrapping joist hangers around it to pick up the roof joists.

I'm kicking myself now... I'd considered an I section steel (well the Builders Merchant suggested it) but I couldn't see how we'd get it in.

Cheers

[Busa mav]

whilst you are only talking about a 1200 opening here ,

the lintel manufacturers state that the top hat style lintels should not have a direct point load applied to the flange, to meet their loading specs , a row of blocks would be needed first.

I would go with TA 14's suggestion , much user friendlier too.

[V8RX7]

Busa mav said:

whilst you are only talking about a 1200 opening here ,

the lintel manufacturers state that the top hat style lintels should not have a direct point load applied to the flange, to meet their loading specs , a row of blocks would be needed first.

I would go with TA 14's suggestion , much user friendlier too.

I asked my Struct Eng about this - and about using conc lintels the same way.

He said that he considered a row of joists a UDL rather than a series of point loads - I can't say that I agree.

[Busa mav]

when i get similar situations , I use a small steel with a plate welded to the bottom, just cut the joists back and notch the bottom as required and off you go .

Sounds so easy when said like that , I just draw them