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If you would like to discuss any of the above in more detail, then please contact us. Cavity walls incorporating metal ties have been in use since the 19th century. They are common in dwellings built in the early part of the 20th century and large numbers of such houses were built during the building boom of the 's. Since the cavity wall has become the standard form of construction for housing and buildings of a similar scale.
The floor- and roof-loads are carried on the inner leaf, the outer leaf is simply a weatherproof skin while the ties contribute to the stability by improving what engineers refer to as the 'slenderness ratio'. How do you recognise a cavity wall? By looking at the pattern or "bond" of the bricks. If all the bricks are laid with the long edges 'stretchers' facing you, the wall is probably a cavity wall.
If alternate bricks are laid with the short edge 'header' facing you, the wall is probably a solid wall; 'headers' are used in this way to increase the strength and stability of the masonry. If no cavity is found in this way the wall is probably solid. This will be confirmed by checking the wall thickness at door openings or window reveals.
How it Works Structurally, the cavity wall is a load sharing system with ties laid out in a uniform spacing pattern: At door and window openings the spacing is reduced to mm vertically.
This spacing is most important where cavity walls are most vulnerable: The chief danger in these positions is from wind suction which, on the leeward side of a building, can exert considerable force which the brickwork, strong in compression but weak in tension, cannot withstand without effective ties at the correct spacing. The Wall Ties Although ties in bronze, cast iron and slate are sometimes seen, the commonest material for tie manufacture is mild steel and the commonest manufactured forms are the fishtail or vertical twist ties either galvanised or bitumen coated and the galvanised butterfly wire tie.
All mild-steel ties are susceptible to corrosion over time, as the Building Research Establishment has pointed out in its publications, particularly Digests and Because the service life of the masonry is much longer than that of the mild steel it follows that at some point in its life the wall may need replacement of the ties. Tie Corrosion The process of corrosion of mild steel causes expansion of the ties because the metallic oxide occupies a greater volume than the pure metal did.
This expansion has the effect of forcing apart the bricks above and below the bed joints in which the ties are laid, producing a pattern of horizontal cracks coinciding with the tie positions approximately every six courses. In fair-faced brickwork this will frequently have been re-pointed in the past, resulting in thicker bed joints at regular intervals. There may be some associated diagonal cracking. Because of their light weight the corrosion of butterfly wire ties produces almost no detectable external symptoms.
The tie can corrode right through without producing any evidence on the outside of the building of what is happening. But fishtail and vertical twist ties with their greater bulk of metal, do produce sufficient volume expansion in corrosion to cause a visible splitting of the mortar bed in which they are fixed.
Remedial Treatment The remedy for wall tie corrosion is straightforward: Installing replacement ties alone will restore structural stability but will still leave the masonry prone to damage by expansive corrosion. Except in the case of some thin butterfly wire ties, remedial treatment of the existing ties is essential for a complete repair. Ancillary Work In the course of remedial work it is usually possible to bring older buildings up to modern standards with the use of lateral restraints to secure floors and roofs to the masonry.
Proprietary systems are available through most registered installers as are systems for bed joint reinforcement outlined in Building Research Establishment Good Building Guides 29 and Repointing of the masonry too will enhance its stability and should be considered as part of the work. The Certitude of membership together with adherence to BRE standards offers reassurance to prospective customers on the quality of work.
The availability of the WTIF warranty on completed work provides long term security on work, which, by its nature, is not visible to the customer.
The warranty is issued jointly by the member and the Federation and gives the property owner peace of mind for 25 years. The Member's register is published on this site from which prospective customers can select registered installers for work.
Installers report helpful volumes of work from this source whilst the web presence also reassures customers about the bona fides of installers who might otherwise be just a name in a directory. In addition to these benefits, registered installers are also represented at national level in matters such as health and safety, vocational qualifications etc.
The Federation is recognised in most technological channels including, of course, the internet. To find us just enter the phrase 'wall tie installers' into the Google search engine and you will come across our website.
The warranties that we issue are widely recognised by local authorities, housing associations and mortgage lenders. Furthermore, the recognition we are proud to hold, transfers readily to registered installers who make full use of the Federation's logo and promotional literature.
Installers wishing to join and become Full members of the Federation should contact the Federation's Head Office to obtain and complete two forms:. These, once completed, should be forwarded to our head office at Heald House, Head Street, Liverpool L19 2LY together with the Federation's application fee and any other requested documentation.
An Initial assessment of the application will be made and the applicant contacted by a member of our management team. After this an inspection appointment or appropriate training course s may need to be arranged and successfully completed during the application process which is subject to continuous assessment during it and afterwards.
Finally, we encourage installers to make use of our logo in their promotional material and on their vehicles purpose bromides and van decals are available. The application process is similar to that of the Full Member. Please for further details. The 2 day Surveying Course includes the following:.
The second day is combined with the 1 day Operatives Course which includes: Adhoc personally arranged courses can be undertaken for individual members or for new members subject to availability and at an additional cost.
The CITB collects a levy from construction employers and can use this to support training and skills in construction. It is devoted to building competitive advantage for the construction industry and the people who work in it.
The CITB uses some of their Construction Levy funding to support their registered employers with training grants, however some registered employers may not be required to pay this levy.
The qualifications are based on National Occupational Standards and reflect the competencies required in a range of occupations. Employers and Experienced Employees like the format as the VQs can be achieved whilst working on site with time away from site only being required if training is identified by the Assessor.
The Learner achieves a VQ by building a portfolio of work based evidence and being available for between visits by an occupationally competent Assessor who completes the VQ process. The CITB run the Cskills Awards and works with approved training and assessment centres to enable candidates to achieve their personal development goals. Construction Skills Certification Scheme CSCS Card confirms that the worker has the correct training and qualifications for the type of work they carry out.
Many principal contractors and major house builders require construction workers on their sites to hold a valid CSCS card. CITB offer a range of training programmes for crafts people, supervisors and managers. For more information, please use this link: National Construction College Campuses The CITB run the Positive Image campaign to promote the variety of careers available in construction and to encourage a constant flow of talent into the industry.
The CITB provides the construction industry with minority specialist training and assessment that traditional, mainstream colleges and training centres are unable to offer. Are you up to date with the new Pension Regulations being phased in and affecting all employers? For further information, contact the Pensions Regulator. For further information on the CITB above help and support for construction, please follow this link:.
Click the link below for more details:. Wall Tie Installers Federation We are the representative trade organisation for registered installers of remedial and replacement wall ties and related services in the UK with a 25 Year insurance backed Warranty Scheme. Our Warranty Discover details about our year Guarantee. Landlords Info on our services.
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