Statistics have shown that up to 35% of heat loss in a dwelling is through thermal bridging [see also: Thermal Bridging and Psi Values: An understanding]. Lintels are one of the single most influential contributing factors that can improve a dwellings Standard Assessment Procedure (SAP) calculation and Target Fabric Energy Efficiency (TFEE) rate. By improving the lintel Psi value alone, we can significantly improve the SAP calculation, negating the need for less onerous requirements to upgrade the fabric elsewhere, which assists with achieving a value engineered building fabric.
It is essential, therefore, that specified lintels are able to demonstrate robust performance, as well as fulfilling their primary function: to provide structural support. Here are our top 6 reasons how Hi-therm does just that:
- Low cost solution to reduced carbon emissions and improved TFEE rate
- Does not require a cavity tray Damp Proof Course (DPC)
- Outperforms stainless steel on price and corrosion resistance
- Generates up to 34% reduction in non-repeating thermal bridging
- One-piece lintel, bonding two leafs of a building together
- One-piece lintel that complies with 2013 Part L building regulations
The update to Part L 2013 introduced a minimum standard for the energy required for heating and cooling of the dwelling being assessed. This Target Fabric Energy Efficiency (TFEE) is calculated based on the specific dimensions of the dwelling under consideration. Hi-therm can be a viable alternative to expensive sustainable solutions. It helps improve the building fabric, reduces CO2 emissions and acts as a lintel. It could even reduce cavity requirements from 150mm to 100m, reduce floor and wall insulation width and spec, glazing specifications, block type etc.
DPC’s are difficult to detail and install correctly. Hi-therm does not require a DPC*, saving time on installation and reducing the overall cost of the build. The insulation which is factory fitted within Hi-therm also helps ensure consistent continuality of cavity wall insulation without any thermal breaks.
*Unless in areas classified as very severe by NHBC
Hi-therm is an excellent alternative to stainless steel lintels. Not only is it less expensive as its stainless steel counterpart, it is also is more thermally efficient. Moreover, Hi-therm is more corrosion resistant than stainless steel, making it ideal for any coastal project.
Standard lintels are made of a highly conductive material: steel. Thus, they contribute significantly to the buildings overall thermal bridges. The GRP component of the Hi-therm lintel means that it has much lower conductivity than steel, reducing total heat loss through lintel’s substantially. This reduced thermal conductivity means that the Psi Value applied to the calculations for this key thermal bridge may be reduced to 0.05 w/mK or lower, subsequently reducing the buildings overall massively.
Hi-therm is a one-piece sustainable lintel solution. The Hi-therm lintel bonds the internal and external walls together by spanning the intervening gap with a thermal break plate and contributes towards the achievement of the Target Fabric Energy Efficiency (TFEE) standards required. The Hi-therm lintel utilises a two-piece construction with a galvanised steel component supporting the inner blockwork connected to a GRP component supporting the outer brickwork.
With split lintels you need to install two separate lintels, then install a DPC, increase the number of wall ties to stabilise the cavity and install insulation between the two separate lintels, which must be cut and measured on site and finally fit a cavity closer. All these components are an additional cost on the build. Moreover, these components are time consuming to install as well as increasing the cost of labour makes installing split lintel timely and are not often chosen by builders. Hi-therm is installed exactly as a regular cavity lintel, bridging the cavity with no extra components needed and no extra labour which meets the approval of builders.
Hi-therm is significantly more thermally efficient than a standard cavity lintel achieving PSI values of just 0.05 w/mK. A PSI value certificate can be produced for your specific cavity build up for free via our website here.