Helifix Helical bar Masonry Reinforcement

[Jerry C]

I dont understand why these companies dont tend to install crack stitching on the inner leaf of masonry cavity wall properties just the outside skin. After all the inner skin carries the load ?

 

[masonrygeek]

Not always. Some cavity walls or multi-wythe walls share the load equally between the wythes.

 

[dik]

mg... like your use of the terminology...

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[Jerry C]

I have never seen that in the UK please expand on a cavity wall with load bearing twin wythe detailing. I really am all ears although I am not sure it answers the original question.

 

[r13]

Why worry the inner faces of cavity wall?

 

[Tomfh]

Can’t see the inside skin.

 

[hardbutmild]

I have never seen that in the UK please expand on a cavity wall with load bearing twin wythe detailing. I really am all ears although I am not sure it answers the original question.

Considering that we're talking about stitching it's safe to assume that we're talking about existing structures, not new walls.
In some historic buildings in continental Europe (usually mediterranean) you could have two load bearing wythes on the outside filled with rubble material in between (I'm not really sure if this is technically called a two wythe wall, but it should behave in the same way). These are usually stone walls where outer layers were made of finely cut stone (like ashlar) filled with pebbles or similar material.

EDIT: I found a picture explaining what I meant

 

[dik]

and a flashing...

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[hardbutmild]

@dik
This is just a sketch that I found online. The point of it was to show the cross section of the wall, I wasn't trying to show water permeability.

 

[Jerry C]

Im confused what relevance does a historic solid wall to my question. In the UK Helifix only seem to stitch cracks in the outer non bearing leaf when there has been movement. I think it may be laziness as removing plaster and various fixtures / fittings is too much hassle.

 

[GeorgeTheCivilEngineer]

Does inner leaf cracking matter much?

Outerleaf cracking allows excessive water ingress and is aesthetically bad.

 

[hardbutmild]

Im confused what relevance does a historic solid wall to my question.

I'm sorry, I misunderstood the question (and didn't notice that I was replying to OPs post). It wasn't really clear what you were referring to in that second post. You asked how can a cavity wall have two load-bearing wythes and I replied that a lot of historic walls do (it's obviously possible). But it doesn't matter now.

 

[r13]

Jerry C,

Are you sure you understand the need to stitch/seal the bricks, and how it is carried out (using Hlifix product)?

https://www.helifix.co.uk/products/remedial-products/crack-stitching/