lintl size

[marsaday]

I am making a new opening for a window and will need a hidden lintel on the internal wall. the opening is 630mm wide ad so i wondered what depth lintel i needed?

 

[Static]

Whats above the lintel? Roof? Floors? Any beams?

 

[marsaday]

gable end wall and to be added a new attic floor.

 

[Static]

A catnic CG50/100 or CG70/100 top hat lintel would be more than man enough..

Depending on cavity width and inner leaf width..

 

[marsaday]

its a solid brick wall

 

[Static]

Riighht.. when you say hidden on the internal side what do you mean? will it be plastered? exposed brickwork?

Might be simplest with a concrete lintel but will be exposed both sides

 

[marsaday]

i thought concrete too.

it will be on the inside course, so hidden. the outside has a brick solider lintel formed.

what size concrete do i need then in depth?

 

[Static]

Well might consider a CN51C or 50C from Catnic if your already hacking the wall about
http://www.catnic.com/static/lintel-downloads/CN49C.pdf

 

[marsaday]

on the drawing i have L1/s 100 lintel written. Not sure what this is ?

is it a catnic?

 

[Static]

on the drawing i have L1/s 100 lintel written. Not sure what this is ?

is it a catnic?

Thats an IG one.. lets see.. ah here:
http://www.igltd.co.uk/standard_lintels/index_iframe.htm

So a top hat lintel for a 100 cavity.. not really what you need..

 

[marsaday]

So can i use concrete? or do i need a catnic?

What size depth will i need.

 

[Static]

i thought concrete too.

it will be on the inside course, so hidden. the outside has a brick solider lintel formed.

what size concrete do i need then in depth?

Personally not a great fan of soldier course lintels, so would recommend a catnic that supports the whole wall..
But you can put a simple concrete lintel on the inner leaf, depending on the amount of floor loading the lintel.. but if there isnt more than about 5m of floor above then a simple 65-70mm deep precast lintel should be fine..
If theres a bath or any point loads over the lintel might wanna beaf that up a little..

 

[marsaday]

ok thanks for that.

i would prefer to have a lintel which goes the full way through and so i dont have to form a solider curve - makes life easier.

but if i do use a lintel wont the bottom of the lintel be seen from outside? if i am right in thinking, a catnic lintel has space for the soldier course to go in. but the bottom of this lintel is still seen? am i wrong?

 

[marsaday]

I know how to do it now !! The catnic lintel sits back a bit and so you do not see the metal frame.

What length catnic do i need for a 630mm opening. is 750 too small. this would give 60mm bearing either side.

 

[geraint]

i thought concrete too.

it will be on the inside course, so hidden. the outside has a brick solider lintel formed.

what size concrete do i need then in depth?

Personally not a great fan of soldier course lintels, so would recommend a catnic that supports the whole wall..
But you can put a simple concrete lintel on the inner leaf, depending on the amount of floor loading the lintel.. but if there isnt more than about 5m of floor above then a simple 65-70mm deep precast lintel should be fine..
If theres a bath or any point loads over the lintel might wanna beaf that up a little..

what a dangeroud thing to say.... i suggest the op ignores this mans advice...