Check Cavity Wall Ties

Replace rusty wall ties

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How to replace cavity wall ties

Order and Free Technical Help - 01626 872886 - discuss your wall tie building problem with a Qualified Dampness Expert (C.R.D.S.)

A borescope, metal detector, surface thermometer and a 'damp meter' (see are useful tools for this diagnosis.

Checking Cavity Wall Ties - defects that can occur and some tips:

Cracking in walls

Horizontal cracking in the brickwork, blockwork or render: this can indicate wall tie failure, but might also be connected with other types of movement. Consult a qualified Structural Engineer. If the cracks are thought to be a wall tie failure symptom locate the ties with a metal detector and either insert a borescope through a small, drilled hole (usually 10mm diameter) or remove a brick or block. Check which type of tie you have - a 'fishtail' tie or a twisted wire tie. Fishtail ties can expand enough to cause cracks and must be removed, or isolated, after new ties have been fixed. Twisted wire ties cannot rust enough to cause cracks, so do not require 'isolation' or removal. In either case visible red rust or white rust indicates sufficient corrosion to require replacement (see the BRE guide notes on Wall Tie corrosion categories).

Remedy - detect the existing ties with a metal detector, mark out a new diamond pattern and fit replacement ties and then isolate (with a Clan Sleeve, Rockwool or builder's foam) any 'fishtail' ties.

Bulging walls

Bulging of the wall - danger: walls with bulges can collapse without warning - cordon off and immediately consult a qualified Structural Engineer.

Remedy - if the Engineer considers the bulge to be within the allowable tolerance, fit replacement ties and then isolate (with a Clan Sleeve, Rockwool or builder's foam) any 'fishtail' ties. Otherwise, the wall will have to be taken down and rebuilt. Sometimes the top triangle of a gable wall bulges because it is single leaf (4.5 inch) - check from inside the roof).

Bulges that have been cleared by a qualified Engineer

Sometimes bulges are due to insufficient tie density - modern Standards require at least 2.5 ties per square metre.

Remedy - detect the existing ties with a metal detector, mark out a new diamond pattern and fit additional ties to meet the Standard.

Replacement Tie types and limitations

Wall construction problems: bricks with holes in them (potted) or with big voids each side (frogged) can be difficult to re-tie with a mechanical expanding type replacement.

Remedy - in these cases you may need to use resin fixing ties. (See Price List below)

Checking the original tie type fitted - a Tip

Checking the existing Wall Tie type - a useful tip - if you do not have access to a Borescope or a Metal Detector you can sometimes view the ties from the cavity using a torch and small mirror, either in the roof space at the top of the wall or by taking out an air brick. This also allows you to measure the cavity width, a dimension needed when ordering remedial ties.

Quick Ties - easy to install, mechanical fix.

Type - Mechanical Tie PN11FX (with unique Shear Nut).

Sizes - typical - 11mm x 200mm, 11mm x 225mm, 11mm x 250mm

How many do I need - 2.5 ties per square metre, including doors and windows in the area.

How to calculate size - outer wall thickness + cavity width + 55mm

Limitations - not suitable for bricks with multiple holes, large 'frog' cavities or of very soft material - ask about our Resin fixing Ties for these types of wall construction.

Mechanical Tie - PN11FX (with unique Shear Nut)

As used by the Trade - Quick Ties are inserted into 10mm holes

1. Simple tool tightens inner and outer sleeve

2. Can be driven with an electric screwdriver

3. No resins required

4. Quick to install - just drill, blow out dust and fix

The speed of fix of the ‘Quick-Fix’ tie with a torque set electric drill is probably the fastest currently available in the UK market

To Purchase replacement wall ties: prices shown here exclude VAT

Note - we will split boxes, so you can buy any number of Ties.


Mechanical Wall Ties, 11mm diameter - select your length as calculated above:

200mm - box of 150 ties - £112 -

225mm - box of 150 ties - £120 -

250mm - box of 150 ties - £132 -


Other lengths available - call 01626 872886 .

Fixing tool - stainless steel, thin wall socket - to fit an electric drill - £20.00 -

Blow out tool - puffer pump, to remove dust - £4.99 -

Resin Fixing Wall Ties - 11mm diameter - select your length as calculated above:

305mm - box of 150 ties - £150 -


Other lengths available - call 01626 872886 .

Epoxy Wall Tie Resin - 300cc - allow one tube per 10 ties, which will fix both ends - £19.36 -

Blow out tool - puffer pump, to remove dust - £4.99 -

The Quick Fix PN11FX double expansion remedial wall ties are manufactured from corrosion resistant Austenetic 304 Grade Stainless Steel tie bars with Neoprene sleeves.

The ‘Quick-Fix’ tie features a unique ‘tall-nut’ which when turned with a setting tool, rotates the whole tie bar, forcing the inner leaf Neoprene sleeve to open and grip in the masonry.

The inner fix has now been created. At a factory set torque level, the end of the ‘tall nut’ shears away and the remaining nut is forced down the tie bar to expand the Neoprene sleeve to grip the outer leaf.

NOTE - Don't forget that, if you have existing ties called 'fishtails,' you may need to expose the outer ends of the original ties and 'isolate' them with Rockwool, builder's foam or similar, to prevent future rusting from causing expansion inside the mortar joints and horizontal wall cracking.

Click here for a Product Data Sheet

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Site written by: David Moore

David Moore, B.A. (Hons.), C.T.I.S., C.R.D.S. Technical Author


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