Wall tie spacing and positioning In cavity walls where both leaves are 90mm or thicker there should be a minimum of 2.5 ties per square metre. The maximum horizontal spacing is 900mm and the maximum vertical spacing is 450mm, although this may be varied if required by the Building Regulations.

How often do you fit wall ties?

It is very important to get the wall tie spacing correct to ensure structural stability. When you are replacing wall ties, 2.5 wall ties per m2 is recommended. This translates to at least one wall tie every 900mm horizontally along the brickwork and at least one tie every 450mm on the vertical.

What is the common vertical spacing for wall ties at Reveals?

Wall tie spacing should be at 900mm centres vertically by 450mm centres horizontally, in a staggered ‘domino 5’ pattern (PD 6697: 2010).

How far apart should brick ties be?

You need two and a half wall ties per square metre of masonry. The maximum horizontal spacing is 900mm and the maximum vertical spacing is 450mm. That’s why cavity wall insulation boards usually have a maximum dimension on the short edge of 450mm.

What wall ties do I need?

As a general rule, ACS recommend opting for either a type 2 or type 4 wall tie due to their increased compatibility and availability. Type 4 wall ties are a light duty wall tie which is used to join together two masonry leaves. Designed for use on domestic homes up to 10 meters in height.

How long do brick ties last?

These ties were expected to last the lifetime of the building, but it has since been recognised that these wall ties can corrode after only 15-20 years.

Do wall ties go below DPC?

Wall ties should: be long enough to be embedded a minimum of 50mm into each leaf. be stainless steel or non -ferrous. be spaced above and below the DPC in accordance with Table 10.

Can you bend wall ties?

Ties should never be slid into a joint. The bending of installed wall ties should be forbidden at all times as this affects the performance of the tie and weakens the embedment in the inner leaf.

Where do you put brick ties?

Wall ties, sometimes called ‘brick ties’, are used in buildings with cavity walls. They are used to join the two leaves of a cavity wall together, allowing the two parts to act as a homogeneous unit. Hidden from view after construction, wall ties play a vital role in ensuring the stability of a building.

Why do wall ties fail?

Wall tie failure can happen where there has been corrosion of the existing wall ties or when insufficient or incorrect wall ties have been installed. When a mild steel or galvanised steel wall tie corrodes, there is a build up of rust (also known as iron oxide), which causes the tie to expand in size.

What happens when wall ties fail?

The main signs of wall tie failure are: Horizontal cracks in the walls – Wall tie failure can often be identified by the horizontal cracking that results from the expansion caused by the rusting process. Bulging walls – Rusty and expanding wall ties can also cause brickwork to bulge outwards.

How thick should cavity wall insulation be?

Essentially, the residual/clear cavity between insulation and outer leaf should be at least 50mm, except in areas of very severe exposure, where it must be 75mm if the outer leaf is fair- faced masonry. Absorbs any surface irregularities on the inner leaf.

Are brick ties necessary?

Many national and local building codes require brick ties to be utilized in the construction of any single-layer brick wall. Left unsupported, such walls are vulnerable to damage from weather, earthquakes and settling foundations.

How long do wall ties last?

In houses built before the 1980s, you can expect the wall ties to last around 15 to 20 years. For properties built since the 1980s, wall ties are generally made of stainless steel and can last over 50 years.