BRICKS, BLOCKS 34 & LINTELS
Thermal Bridging:
A Challenge for the Wall Tie Industry
Wall Ties are an essential element in the strength and stability of a cavity wall, but by crossing the cavity they act as a thermal bridge between the internal and external leaves.
Generally speaking, the wider the insulated cavity, the more substantial the Wall Tie needs to be and the greater the effect the tie will then have on the U-value of the wall.
Example Wall Profiles
T
he challenge for the Wall Tie industry, set by the Government’s ambitious energy efficiency targets, is to reduce the thermal conductivity of its products whilst continuing to meet the structural performance requirements of wide cavity construction.
Ancon’s Solution Ancon Building Products has met this challenge by launching a new range of Low Thermal Conductivity Wall Ties; ties which minimise heat loss through thermal bridging, thereby improving the energy efficiency of a wall. These products can actually be used to reduce insulation thickness and therefore provide savings on construction materials and wall footprint.
This new range of Ancon Wall Ties suits cavities from 50mm to 300mm, essentially future-proofing traditional masonry cavity wall construction with which all clients, contractors and designers are familiar.
In addition to a number of high tensile stainless steel wire Wall Ties, this range includes the new Ancon TeploTie which is manufactured from pultruded basalt fibres set in an epoxy resin.
The TeploTie has a BBA approval and is available exclusively from Ancon Building Products. It has a thermal conductivity of just 0.7W/mK, making it the most thermally efficient Wall Tie on the market.
U-Value Calculations
When calculating a U-value it is important to use the actual cross-sectional area of a Wall Tie and the thermal conductivity of the material from which it is manufactured, rather than allowing a calculation program to apply default values. This can make a considerable difference to the result; a default value will over-estimate the thermal bridging effect of an Ancon Wall Tie and designers may increase insulation width and wall footprint unnecessarily.
Any heat loss through Ancon Low Thermal Conductivity Wall Ties is negligible and so these products are excluded from U-value calculations in accordance with EN ISO 6946.
Independent tests have proven that the Wall Tie referenced HRT4, which forms part of Ancon’s low thermal conductivity range, meets this stringent acoustic requirement. The HRT4 is suitable for use in separating walls with a 50mm, 75mm, 100mm and 125mm cavity – this is another first in the industry from Ancon.
New literature is now available on this range of Low Thermal Conductivity Wall Ties. Contact Ancon on 0114 275 5224 or visit
www.ancon.co.uk/LowConductor
Ancon Building Products Click here to request literature
TEPLOTIE
Ancon Low Thermal Conductivity Wall Ties
Passivhaus Project The new Ancon TeploTie has already been used on many high profile, energy-efficient projects. Most recently it has been installed on a ground-breaking residential development in West Yorkshire. This project aims to be the first certified Passivhaus home in the UK to be built with traditional masonry cavity walls. Passivhaus is a standard for constructing low energy buildings and is thought to provide excellent levels of comfort in both winter and summer.
The masonry walls of this particular development comprise an inner leaf of dense concrete block, a 300mm cavity filled with fibreglass insulation batts and a natural stone external leaf. The project leader; Mr Bill Butcher of the Green Building Company, said “Our choice of Wall Tie has been carefully modelled in the Passivhaus Planning Package - the design tool for architects designing to the Passivhaus standard. The use of basalt wall ties (TeploTie) gives us a nil reading for heat transference”.
Internal Separating (Party) Walls In addition to providing a thermal bridge, Wall Ties can also transfer sound across a cavity. Approved Document E: Resistance to the Passage of Sound specifies the requirements for Wall Ties for use in internal separating walls of new build dwellings. It states that ties must have a measured dynamic stiffness of less than 4.8MN/m3
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