200mm cavity what size of wall ties?

[CalvinHobbes]

300mm or 325mm?

[PeterW]

BS:845-1 and Approved Document A state cavity plus 125mm and then select the nearest standard length.

 

Search around though as I’ve seen 350mm cheaper than 325mm..!

[ETC]

https://www.ancon.co.uk/blog/how-to-ensure-sufficient-embedment-of-wall-ties#:~:text=Contractors are advised to double,construction about to be undertaken.

[ETC]

Check Ancon but will defer to the relevant BS.

[ETC]

https://nhbc-standards.co.uk/2020/6-superstructure-excluding-roofs/6-1-external-masonry-walls/6-1-18-wall-ties/

[PeterW]

1 hour ago, ETC said:

https://nhbc-standards.co.uk/2020/6-superstructure-excluding-roofs/6-1-external-masonry-walls/6-1-18-wall-ties/

That NHBC guidance is incorrect as it does not include Note 3 from Table 5 of Approved Document A, which refers to cavities of over 175mm (of which this is) and a requirement for 125mm or 62.5mm embedment in each wall.

 

Ancon have an easier to read version here and the full version is here on Page 23.

 

 

[CalvinHobbes]

Thanks so much, we got them! Ouch , eye watering price but hey ho, we want to get it done right.