Trusted Expertise in Wall Tie Repair & Survey Reports

The tie in a cavity wall is used to tie the internal and external walls (or leafs) constructed of Bricks or cementitious Blocks together. It is placed in the cavity wall during construction and spans the cavity. The ends of the tie are designed to lock into the cement.

Also incorporated into the design of the tie is means of preventing water transfer from the outer to the inner leafs. In flat ties this can be a twist. In wire ties this can be corrugations formed in the wire or again a twist.

Cavity Walls

Cavity walls often have Insulation in the cavity which may either partially or fully fill the cavity. Partial fill insulation systems require specialised ties or clips to keep the insulation in position. A vapour barrier may be necessary on the inner wall to prevent interstitial condensation. This is often incorporated into the cavity wall insulation system. The spacing of ties is laid down in building regulations, though there may be variations with specialised blocks. Additional ties are used around window and door openings

Improper installation may lead to water damage or fungus formation within the cavity, leading to structural and health hazards.

This is an increasing problem with cavity wall ties made from galvanised steel. It arises when the galvanising is not of sufficient quality and the outer leaf of the cavity wall allows water penetration, usually due to porous brick/block work. If the tie rusts, the swelling effect may cause horizontal, external cracks to appear in the wall. Frost action can swiftly enlarge these cracks to cause damage.

About us

Colne Valley Preservations is a family business based in Nelson, Lancashire. We have successfully been established since 1981 with over 40 years experience in Remedial Treatments of Damp Control, Damp proofing, Rising Damp, Penetrating Damp, Lateral Damp, Condensation and Mould Control, Timber Preservation, Wood Infestation, Dry Rot, Wet Rot, Woodworm, Timber Treatment, Structural Waterproofing, Basement Waterproofing, Cellar Tanking, Wall Tie Replacement, Lateral Restraints, Crack Stitching.

We also do Electro Osmosis Damp Proof Courses, DPC Chemical Injection Damp Proof Courses, DPC and Re-Plastering in line with trade body specifications.