What is the standard wall tie spacing in the UK?

Under UK Building Regulations (Eurocode 6), the standard spacing for wall ties in a cavity wall is 900mm horizontally and 450mm vertically, in a staggered pattern. This equates to 2.5 ties per square metre (m2).

Why do I need extra ties around windows and doors?

Openings create weak points in a wall. You must install additional ties at no more than 300mm vertical centres within 225mm of the edge of any opening (windows, doors, or movement joints) to provide extra structural stability.

Can I use galvanised wall ties?

In modern UK construction, stainless steel wall ties are mandatory for almost all applications. Galvanised ties from the 1960s-80s are prone to 'wall tie failure' where they rust and expand, eventually pushing the brickwork apart. Always use grade 304 or 316 stainless steel.

How far into the brickwork should the tie go?

A wall tie should have a minimum 'embedment' of 50mm into both the inner and outer leaves of the wall. For a standard 100mm cavity, you would typically use a 225mm or 250mm long tie.

What is the standard wall tie spacing in the UK?

Under UK Building Regulations (Eurocode 6), the standard spacing for wall ties in a cavity wall is 900mm horizontally and 450mm vertically, in a staggered pattern. This equates to 2.5 ties per square metre (m2).

Why do I need extra ties around windows and doors?

Openings create weak points in a wall. You must install additional ties at no more than 300mm vertical centres within 225mm of the edge of any opening (windows, doors, or movement joints) to provide extra structural stability.

Can I use galvanised wall ties?

In modern UK construction, stainless steel wall ties are mandatory for almost all applications. Galvanised ties from the 1960s-80s are prone to 'wall tie failure' where they rust and expand, eventually pushing the brickwork apart. Always use grade 304 or 316 stainless steel.

How far into the brickwork should the tie go?

A wall tie should have a minimum 'embedment' of 50mm into both the inner and outer leaves of the wall. For a standard 100mm cavity, you would typically use a 225mm or 250mm long tie.

Wall Tie Calculator

Plan your tie counts for cavity wall construction.

Net Wall Area (m²)

Total Opening Perimeter (m)

Windows & Doors

Fixing Order

Safety Tip: Always install wall ties with the 'drip' facing downwards in the centre of the cavity. This prevents water from traveling across the tie from the wet outer leaf to the dry inner leaf.

Structural Bonds: The UK Wall Tie Guide

Connecting the Cavity

Wall ties are the invisible strength of a modern UK home. They lock the outer decorative leaf of brickwork to the inner load-bearing leaf of blocks, allowing them to act as a single structural unit while maintaining a thermal break.

Our **wall tie calculator** ensures your project meets the strict density requirements of **Eurocode 6**, helping you order the correct number of boxes while accounting for the mandatory extra ties around windows and doors.

Standard Density

Horizontal Spacing900mm

Vertical Spacing450mm

Opening Spacing300mm Vertical

Installation & Moisture

The most common error in wall tie installation is the 'wrong way around' drip. Every tie has a shaped section (the drip) designed to shed water. This **must** be positioned in the centre of the cavity with the point facing downwards.

If the tie is level or sloping towards the inner leaf, rainwater hitting the outer brickwork will travel along the tie and create wet patches on your internal plasterboard—a problem often misdiagnosed as rising damp.

Grade 304 vs 316

For most of the UK, **Grade 304** stainless steel is the standard. However, if your project is within 5 miles of the coast, you must use **Grade 316** (Marine Grade) to resist the highly corrosive salt in the air.

Movement Joints

Long runs of brickwork require vertical movement joints (usually every 10-12 metres). These joints also require additional wall ties, spaced exactly like a window opening, to maintain the stability of the two free ends.

Pro Tip: Keep it Clean

When laying the inner leaf, mortar 'snots' (excess wet mortar) often fall into the cavity and rest on top of the wall ties. If left there, they form a 'bridge' that water can cross. Pros use a **cavity batten** (a long piece of timber) to catch this mortar and keep the ties clean as they build up.

Wall Tie & Structural FAQ

Project Disclaimer

Incorrect wall tie installation is a structural safety risk. Always ensure ties are bedded into the mortar and not just placed on dry brickwork. For specialised structural repairs or remediation of existing wall tie failure, consult a qualified surveyor.