HOW TO INSTALL A LINTEL?

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Landcruzer

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Hi, I am opening out a fireplace and CW in a previous post was most helpful.
However this is what I want to do and have some more detailed questions.
Here is the opening at present.

Untitled

Untitled


This is what I intend to do.

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Untitled


Opened out size will be 80cm high x 69cm wide.
The red lines are where I intend to support with 2 x Strongboys.
The thick black line is the intended new lintel.
Blue line denotes new opening.
The green lines are breeze block which i can take out and then cut
up and down through the blocks to give me my opening.

Questions.
1. what type and size of lintel should i use? ( Bungalow - chimney is breeze block up into attic, brick just before it goes through roof).
2. What infill should I use below new lintel to form top of opening, and what holds it up!!?
3. Make good with heat resistant render and plaster?

Thanks in advance for any help. I can do this...just need some guidance
 
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you need 150mm each side i thinks
use a concrete lentel single skin will do (100mm)wide
cut it in the block work point it up sorted i may be rong think you can cut out some of the block work on the sides and re do it in brick tye it in then set the lintel
 
thanks pistering...but...so with 150mm each side that would be a 99cm lintel. Is it ok to cut down a 1.2mtr lintel to say, 1mtr?
why a 100mm deep lintel...is that to allow enough room to render and plaster? How thick a lintel should I use?
Single skin lintel...whats that? Should I use a prestressed concrete one?
What should I use below the lintel to form the top of the opening ? And what holds it up?
 
100mm bearing is enough for spans up to 1m.

Lintel should be the same thickness as the masonry it is supporting, so for your 100mm blocks you need a 100mm wide lintel.

As it's carrying just a triangle of masonry a 100mm wide by 65mm deep lintel will be plenty strong enough. Download a Naylor Lintels brochure and they give you load capacities.
 
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Thanks Ronny,
So I should be ok with a 900 x 100mm deep x 65mm thick?
Once I have removed the throat lintel what should i use below it
to form the top of the opening? And what does it sit on to stop it falling?

What do you mean by triangle of masonary?
Cheers.
 
firelintel.jpg

1m long and 100mm wide is just fine
wickes sell them on the shelf bag of builders sand bag of cement sorted
 
Does he need the Strongboys? I would have said not. Nothing much to fall down if it tried.
 
Thanks Plastering,
Can you look at my picture though. The center block is higher
than the ones either side which would leave a 2" gap above the
lintel in the middle. What do I fill this with?
 
cut down some fletons (bricks) cut the frog out of them then lay them
as as norm point it up nice ans good by cutting the top off the bricks use a bolster and club hammer
 
Landcruzer said:
Thanks Ronny,
So I should be ok with a 900 x 100mm deep x 65mm thick?
Click to expand...
Should be fine.
Landcruzer said:
What do you mean by triangle of masonary?
Click to expand...
Because of the bond of the blockwork the load will be spread at 45 degrees to the masonry on either side of the lintel.
joe-90 said:
Does he need the Strongboys? I would have said not. Nothing much to fall down if it tried.
Click to expand...
Probably not...worst that could happen is one block will fall out. Would all probably stay there just fine if no lintel was put in, but I didn't say that :!: :eek:
Landcruzer said:
Thanks Plastering,
Can you look at my picture though. The center block is higher
than the ones either side which would leave a 2" gap above the
lintel in the middle. What do I fill this with?
Click to expand...
The central block is higher, but by the time you've got the lintel sat on the bed joint, that will have taken up the two inches and a bit more. You'll need to trim the bottom of the block. I'd cut a slot and install the lintel, then remove the masonry below...
 
Thanks RonnyR,
All sounds good to me now.
If I wanted to open out a bit wider i will put in a
larger lintel. Do you know if it is ok to cut these
with ,say, an angle grinder as 1.2mtrs would be too large
given the breast width?
 
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