Filling crack in 4” block wall

[milkloss]

At home we’ve got a wall that has a horizontal crack in it that’s following the mortar between the blocks. It’s is due to some of the ground settling where we had a basement dug, also possibly due to moving a doorway. It’s two blocks off floor level and has 7blocks above that seem to be defying gravity!! About 5 blocks horizontal, 6mm at its worst and taken 7 years from renovation.

Anyhow, what’s the best way to fill said crack? I’m thinking mortar gun with some sort of mix in it, PVA in the crack to help it bond?

Any info appreciated.

 

[Lincs Lass]

Use SBR not pva in a strong cement mix

 

[onthehoof]

Cut the mortar out a bit with disc cutter then use chemical anchor to fill it.

 

[milkloss]

Thanks for responding. So basically what I’ve got is an internal wall that ends against a door frame. The bottom two high and two away from the frame have slumped 7mm maybe and the crack gets smaller one block high as you move away to the basement foundation wall, 6 blocks. It doesn’t support anything above particularly at the point where it has slumped, on the other side of the door though it does have a padstone where it supports a steel above but there is no sign of issues there. The only concern I have (at the moment!) is to hold up the blocks above really as I don’t want them deciding to come down and meet the bottom blocks. That is sortable with the mixes you’ve suggested but what if it moves further? Should I use a weaker filler than the original pug and not worry too much about binding it together to save it potentially all moving together or cracking elsewhere?

Thanks again.

 

[Lincs Lass]

Is there anything to stop you underpinning it ,,even if it was just a shallow fill with some rebar for strength

 

[milkloss]

Is there anything to stop you underpinning it ,,even if it was just a shallow fill with some rebar for strength

yes, some rather fancy limestone! I have a feeling when my Father converted the house in the 60’s there was only a skin of concrete over the gap where the door originally was. Kind of hoping we won’t have to go down the underpinning route and just fill the gap and see what happens over the next few years. As I said, it isn’t structural apart from the 9 or 10 blocks above Which seem to be defying gravity!

 

[steveR]

Pop a stainless steel helicoil rod (or 3) after cutting out the mortar as deep as possible, then fix it with a resin compound. Ties in any wandering block work nicely and provides some solid support for the blockwork above.

I have used the tube resin anchor and helicoil stuff, but I have found a mixed resin compound better, as it is a littler thinner and gets into cracks better.

 

[steveR]

Helibar... not helicoil Brain fade.

 

[PSQ]

Has it stopped moving or is this active subsidence ?