Type of lintel for block?

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I was having my garage renovated and long story short I’m having to finish it myself

Got an opening of 2.1m with block on flat pillars either side

My question is what lintel should I get for block on flat and a roller shutter,

the lintel will have approximately another 3 blocks on top of it but only bearing the weight of timber roof no major weight,

I was thinking a 2.4 concrete lintel or steel lintel but wasn’t sure if it should be 2.7

In addition to this, do you need 2 lintels to make it too the width of a block laid flat or are there other ways to do this? (There is no cavity)

Thanks
 
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The thing is, everytime I build something, I've just installed what the structural engineer specified.

Once, the wall plate was over a gap just greater than 1 metre so it had to be a 9x4 concrete lintel because of the snow load. Probably because structural engineers work to belt and braces standard!!

I would have thought two 6 x 4 concrete lintels would have been sufficient and if you want to fill the gap between them, fit three. A bearing of 6 inch would do so yes, 2.4m.

Under load, he top of the lintel is compressed and the bottom stretched (in tension). So the rebar is closer to the bottom of the lintel in thicker lintels to counter the stretching/tension.
 
The thing is, everytime I build something, I've just installed what the structural engineer specified.

Once, the wall plate was over a gap just greater than 1 metre so it had to be a 9x4 concrete lintel because of the snow load. Probably because structural engineers work to belt and braces standard!!

I would have thought two 6 x 4 concrete lintels would have been sufficient and if you want to fill the gap between them, fit three. A bearing of 6 inch would do so yes, 2.4m.

Under load, he top of the lintel is compressed and the bottom stretched (in tension). So the rebar is closer to the bottom of the lintel in thicker lintels to counter the stretching/tension.

Thanks for the reply, would a catnic steel lintel be a better option,

I’ve seen ones like this below that would allow a face block stood up and then block on flat on top of them?

F4011AEB-82A3-436C-87CA-0F0CD3A64788.png
 
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That's a box type catnic, not really used much nowadays because cavities increased in width. Just a cougar catnic, or similar brand would do.

Because of what you're building, a box or cougar lintel would do. If the box lintel is not the height of a block, you would just need to run a course of 65mm brick over first.
 

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