Lintel in footing close to knock through

[baker332]

Hi all,

Knocking out 3m cavity load bearing wall for remaining upper block work, roof and assume extension roof (not the the full span), joists run parallel therefore upstairs weight remains supported elsewhere. UC are going to sit on the inner skin of the remaining block work on padstones, on knocking out noticed concrete lintel (deep) for a pipe 5-6 courses deeper than the DPM. This lintel spans for a single pipe 200mm.

The concrete lintel is close but not directly under the cavity wall and will not bear the weight as it's not considered as a point load, however the concern is with the structure of brick work being triangular will it be unaffected?

For example, really quick sketch up:

Cavity wall ||
Concrete Lintel ===

| |
| |====
| |
| |

Talking to SE he is unbothered and suggests with it being five courses deep and running the other direction it shouldn't need to be taken into consideration.

 

[baker332]

Any thoughts?

 

[John D v2.0]

Any thoughts?

1 your diagram didn't work

2 listen to your se, they have the insurance to back it

 

[baker332]

It's not really a great diagram, just an overhead really basic drawing from the keyboard! This is displaying the cavity wall where the steel will sit (on the inner skin).

Cavity wall: | |
Concrete Lintel: ===

| |
| |====
| |
| |

The cavity wall has a lintel to the right hand side, the steel will sit on top of the inner skin of cavity wall right above this concrete lintel spanning a pipe. This wall will be removed.

Should the inner skin bearing the weight affect the lintel at all? Although the weight is formed across the inner skin of the wall not necessarily on the lintel below that runs adjacent to the block work.

Thanks

 

[baker332]

It's almost like the following taken from google, yellow line highlighting the inner cavity leaf, that will continue as a wall to extension, then the bricks to the left will be taken down to form part of the opening.

 

[tony1851]

is this what you mean, or is the drain to the right of the bearing, rather than on the left as I've shown it?

 

[baker332]

Hi Tony,

Thanks for this -no you have it spot on!
The opening is right on the edge:

 

[tony1851]

If that's the case, its not going to be a problem. The load distributes downwards as an ever-widening triangle due to the bonding of the brickwork and by the time it gets to the level of the pipe, it will be so 'spread out' as to be minimal.

 

[baker332]

Tony that's what the engineer said, thank you for putting my mind at ease and getting a second opinion.

Much appreciated.

 

[oldbutnotdead]

Hi all,

Knocking out 3m cavity load bearing wall for remaining upper block work, roof and assume extension roof (not the the full span), joists run parallel therefore upstairs weight remains supported elsewhere. UC are going to sit on the inner skin of the remaining block work on padstones, on knocking out noticed concrete lintel (deep) for a pipe 5-6 courses deeper than the DPM. This lintel spans for a single pipe 200mm.

The concrete lintel is close but not directly under the cavity wall and will not bear the weight as it's not considered as a point load, however the concern is with the structure of brick work being triangular will it be unaffected?

For example, really quick sketch up:

Cavity wall ||
Concrete Lintel ===

| |
| |====
| |
| |

Talking to SE he is unbothered and suggests with it being five courses deep and running the other direction it shouldn't need to be taken into consideration.

Assuming stuff like that isn't wise.

 

[baker332]

Assuming stuff like that isn't wise.

I didn't assume, SE did the calcs for everything involved, cheers.