Wall Tie Replacement

Cavity Wall Tie Surveys in Yorkshire

Wall Tie Replacement in Yorkshire, York, Harrogate and Scarborough

Cavity wall tie corrosion can leave your walls with severe cracking, bowed and in an unrestrained dangerous condition. For this reason assessing the condition of your wall ties is a duty which must only be undertaken by an experienced and qualified surveyor.

Our cavity wall tie condition surveys are carried out in accordance with the BRE (British Research Establishment) Guidance. Our surveys are only undertaken by experienced and fully qualified surveyors who hold the National Qualification for remedial surveying C.S.R.T. awarded by the BWPDA / PCA our industry body. This proves that our surveyors have been independently examined and tested, proving their extensive knowledge and expertise.

All of our surveys are carried out in accordance with The British Standards Code of Practice.

To learn more about our building surveys and what's involved read up on our blog posts; www.dryfix.net/blog/ or visit our surveyors photo gallery

Cavity Wall Tie Condition Surveys

Suspect a problem?

Our surveyors can carry out non invasive cavity wall tie inspections using specialist optical equipment without having to dismantle your walls.

In most instances we undertake our inspections within the cavity of a wall using borroscope technology (provided that insulation is not present). Where cavity wall insulation has already been installed, it may be necessary for us to chase out a mortar bed joint or remove a single brick within the outer wall to expose a tie.

After randomly locating and inspecting a series of ties, our surveyors will assess and determine their condition and remaining life span, photographic evidence of our onsite findings is recorded and included within our report. Our reports contain comprehensive advice of any problems identified and include our recommendations, specifications and costs for repairs, if necessary. Edited pictures along with category damage ratings are also included to assist your understanding about the urgency of any repairs needed.

Our reports are available in both printed media and/or converted into secure electronic Portable Documents (PDF) for email.

We are happy to undertake our inspections in the presence of homeowners or their representatives, so that you can be assured of a correct diagnosis.

Our cavity wall tie surveys include;

  • Wall Tie Identification
  • Tie grading and condition assessment
  • Wall tie density and placement
  • Wall tie damage assessment
  • Wall tie orientation

Cavity Wall Tie Repairs

Dryfix use an array of different repair methods and techniques for installing replacement wall ties and preventing damage from existing ties. Our surveyors will specify the most appropriate method of repair based on BRE guidance and individual circumstances.

Tied & Tested

Tried & TestedAfter installing remedial wall ties, we proof test our ties, using specialist tensile testing devices and use digital photographic evidence of our proof testing regime for our records.

We are so proud of our wall tie systems that we invite our clients and their representatives, to view our testing regime.

Suspect a Problem?

We are here to help. If you suspect a problem and require a survey, or need advice please contact us

Request A Survey    Contact Us

"We don't have to tell you we're experts, our customers do that for us" See Testimonials

Want to know more about cavity wall tie corrosion?

Cavity wall tie corrosion is a common problem only affecting cavity constructed properties usually built prior to the 1980's.

What is a cavity wall?

Corroded galvanised fish tail tieCavity walls consist of two 'skins' of masonry separated by a hollow space (cavity). The skins are commonly masonry such as brick or concrete block. The inner skin is structural and load bearing taking the weight of the floors and roof structure. The cavity and outer skin provide an independent envelope around the building to protect against damp migrating internally, a common problem associated with solid walls. Over recent years it has become common to fill the cavity void with insulation to increase thermal efficiency.

Cavity Wall Ties

The purpose of a wall tie is to retain the outer skin wall to the structural inner skin wall to prevent movement and collapse. Primarily ties were constructed from metal (wrought iron / cast iron & mild steel) which were protected from corrosion by bitumen or a galvanised coating. As time has shown, however the level of protection applied to ties installed prior to the 1980's was often insufficient and as a result, in some circumstances, ties can corrode.

When metal ties corrode they expand and where multiple ties corrode in a single mortar joint this expansive force can be sufficient to create a horizontal crack running through the wall. These cracks may appear in the external masonry walls, where the ties are positioned, and can increase in size further up the building as the weight of the wall reduces. Cracking internally as a result of wall tie corrosion is rare however, can happen in severe cases.

Why are corroding ties a problem?

Corroding ties become brittle often up to the point where they are no longer capable of providing the lateral restraint needed to tie the outer wall to the structural inner wall. The cracks created by the corroding wall ties reduce the integrity of the brickwork panels and leave weak and brittle ties in free and oversized mortar joints. Cracks also allow rain water to penetrate into the wall accelerating the corrosion process.

The regular presence of horizontal cracks, increased bed joint sizes and bowing walls may suggest a wall tie problem.

Severely corroded bitumen fishtail tie exposed in outer leaf wall. Severe horizontal cracking occurring as a result of wall tie corrosion Severe cracking and movement to the gable elevation of a house a result of wall tie corrosion
Severely corroded
bitumen fishtail
tie exposed in
outer leaf wall.
Severe horizontal
cracking occurring
as a result of
wall tie corrosion
Severe cracking and
movement to the gable
elevation of a house
a result of
wall tie corrosion.

To learn more about the subject on this page read up on our blog posts; www.dryfix.net/blog/

Suspect a Problem?

We are here to help. If you suspect a problem and require a survey, or need advice please contact us

Request A Survey    Contact Us

"We don't have to tell you we're experts, our customers do that for us" See Testimonials

Structural Repairs

Dryfix Preservation Ltd | Head Office: 57 Ridgeway, Acomb, York, North Yorkshire. YO26 5DA