How many wall ties do I need?

How many wall ties do I need?

The wall tie density is relative to the cavity wall size, height, apertures and openings. For cavities 50-75mm a wall tie density of 2.5 per square meter is required, with 900 mm horizontal and 450mm vertical centres. Wall ties should be evenly spaced except around openings where they should be staggered accordingly.

ACS recommends wall ties achieve a minimum embedment of 62.5mm, this ensures the correct installation of the wall tie and exceeds NHBC requirements.

Timber Frame Ties

Timber frame ties should be installed to a density of 4.4 ties per square meter where wind speed does not exceed 25m/s as outlined in the BS 639902 Code of practice for wind loads. If the building is located in an area which exceeds 25m/s the timer wall tie density must be increased to 7 ties per square meter.

Remedial Wall Ties

ACS recommends following PD 6697 which is to install wall ties at 900mm horizontally and 450mm vertically in a staggered pattern with 300mm vertical centres around openings within 225mm of the aperture. Currently, no British standard has been created for the spacing of remedial wall ties.

Related Articles

30th October 2018

316 Stainless Steel

What is 316 stainless steel? 316 stainless steel or A1 as it is widely known is the second most comm...

read more

30th October 2018

How to install a wall tie

How to install a wall tie Wall ties should be evenly distributed at 2.5 ties per square metre and st...

read more