Often cracks appear in walls because of subsidence related problems.
Shrinkable Clay Soils
- Loss of moisture from clay soils causes reduction in volume – “shrinkage”. As the soil shrinks support for foundations is lost causing subsidence.
- Moisture loss can be caused by evaporation during warm dry spells or by extraction by trees and vegetation.
- Volume reduction can be permanent or temporary (e.g. seasonal). Recovery to the volume greater than that at the time of construction can cause “heave”.
New Helifix literature, featuring the latest innovative sustainable structural solutions
Since developing the original helical fixing in 1984, HELIFIX has continued to innovate, expanding its range to include specialist helical wall ties, fixings and masonry reinforcement systems for use in both new build and refurbishment.
In addition to full product information, the new brochure ‘Principles, Products and Applications’ also includes a summary of the company’s innovation accomplishments spanning almost 30 years.
Following the ABE Yorkshire & Humber Region AGM, James Plaskitt, the local Area Manager of Helifix Ltd, presented an educational seminar about the benefits of using Helifix concealed non-disruptive repair methods with regard to cost-effectiveness, aesthetic impact, project timescales and limiting design implications. The seminar was held at the Think Low Carbon Centre, Barnsley in front of 40 mixed building professionals.
There are between 60-70,000 masonry arch bridges in the UK.
Many of these are over one hundred years old and were originally designed to support the loads of a typical horse and cart. All the bridges in the UK have now been assessed for strength and an estimated 45,000 masonry arches are under-strength for their modern usage patterns.
Helifix and Approved Installer St Astier delivered an interesting and informative CPD seminar to 40 members of the Association of Building Engineers northern region group. Taking place at their annual general meeting, members discussed the modern methods of structural repairs developed by Helifix.
A fast, reliable and non-disruptive method of repairing or creating lintels – particularly during window replacement programmes
With the continued pressure for more homes it is essential that the existing housing stock is both maintained and improved to meet current standards. As housing associations across the country continue to assume ownership of homes from local authorities they become responsible for their upkeep and repair.
Chasing out the mortar joints between storeys on a tower block
As council houses and housing association properties continue to be upgraded, in addition to general maintenance and improvements to domestic facilities, many of the older properties also require attention to resolve a variety of structural problems. Among the most common faults which can result in cracked masonry are lintel failure, differential temperature movement and corroding or failed wall ties. Of particular concern is lintel failure, which is often discovered – causing significant problems – during current widespread window replacement programmes.
With changes in Government legislation, such as Part L of the Building Regulations and the Code for Sustainable Homes, the demand for much improved standards of insulation has increased significantly. Local authorities and social housing landlords are particularly keen to find innovative solutions to improve u-values, bring their housing stock up to the required decent standard and realise the environmental benefits of better insulation through reduced carbon emissions and lower fuel consumption.
A growing means of achieving these goals is through the use of rendered external insulation panels, both on traditionally built solid wall properties and the mass of various prefabricated housing, of which there are around 20 different types, and pre-cast concrete high rise buildings, all constructed after World War II. These have either no cavity or a very narrow one, so the use of cavity wall insulation is not feasible. The use of exterior insulation cladding and specialist external rendering will, in most cases, improve the thermal U value of the walls by some 75%.
Helifix is pleased to announce that it is now part of CRH plc, a substantial building materials group that services the breadth of construction needs from new-build to repair.
The Helifix Group with operations in Europe, USA, Australia and New Zealand, strengthens CRH’s position in these key territories, while for Helifix this change of ownership will allow local entrepreneurship to benefit from large company resources.
HeliBond is an injectable, non-shrink, thixotropic, cementitious grout that rapidly develops high compressive bond strength. It has been specifically formulated by Helifix to achieve the highest standards required that are necessary to ensure effectiveness and structural safety of the repair undertaken using Helifix product.
- Non-shrink grout which exhibits excellent thixotropic properties
- Flows easily under pressure to fill voids
- Rapidly develops compressive strength
- Cures to 45N/mm²
- Ready-to-mix components supplied in two-pack sets to reduce waste
HeliBond is suitable for bonding HeliBars into most common masonry-type substrates, including brick, stone, pre-cast concrete and Aircrete blocks.
Helifix will be presenting a number of CPD seminars at various locations to Chartered Surveyors during November 2012. ‘Building defects in residential and commercial premises’ seminars will discuss why buildings that have gone wrong, is a part of the process of getting buildings right at the start.