Underpinning

[seasickstevie]

I'm digging down (section by section) and putting in deeper founds for solid 9" wall.

If I make up the distance with two 100mm block, it's too thin.
If I use 135mm it's too thick.

Should I use one 100mm skin and one 135mm which is about right.

(I've probably answered my own question really)

 

[Shytalkz]

Why aren't you just filling with concrete?

 

[seasickstevie]

I'm in the basement, and gone down a good bit. Need a bit more headroom.

Altered a doorway etc which means there's gaps in places where the brick is no more. Obviously quicker to make it up with some blockwork.

 

[seasickstevie]

I have concreted the founds btw!

 

[Shytalkz]

Ah right. You've answered your own q as you suspected!

 

[stuart45]

Its better to lay 4inch blocks flat for a 9inch wall.

 

[^woody^]

They crack much better that way too with the slightest movement.

Unless you lay them straight joints for two course and then bond them

 

[stuart45]

2 courses of straight joints and then half bonded is the normal way on site for a niner.