ALUTHERMO ROOFREFLEX ® by Novia Ltd
ALUTHERMO ROOFREFLEX ® by Novia Ltd
The Role of RoofReflex Within Building Elements Under New Part L Building Regulations
Novia Limited explains how Aluthermo RoofReflex can solve construction issues associated with achieving u-values required under changes to Part L Building Regulations , June 2022
In June 2022 , Part L of the Building Regulations was updated to include revised u-values for new builds , refurbishments , and extensions . These updates are designed to improve the energy efficiency of buildings and reduce their carbon footprint . New Approved Document L ( ADL 2021 ) which came into effect 15th June 2022 , gives technical guidance on how to meet the energy efficiency requirements contained in Part L of the Building Regulations . There are two parts to ADL 2021 ; Conservation of Fuel and Power , Volume 1 – Dwellings , and Conservation of Fuel and Power , volume 2 – Buildings Other Than Dwellings ( ADL1 and ADL2 respectively ). These documents set out the acceptable provisions for compliance with Building Regulations with regards to energy efficiency requirements .
The new u-value requirements for the three building elements ; roofs , walls , and floors , can be found in the table above :
The most common way to improve on u-values is to increase the amount of , or change the type of , insulation . The ‘ New Builds ’ u-value
New Builds
requirement for roofs is particularly difficult to achieve at 0.11 W / m ² K . To get to these low levels , typically , two thickness of PIR insulation ; 100mm and 75mm , are used between the truss , and 25mm below rafter for thermal bridging . Insulation distributors seldom stock PIR boards greater than 150mm thickness hence the need for two separate boards between the rafters . The extra cutting on site and cost of multiple PIR insulation boards makes this a laboursome and expensive solution . Often , deeper trusses are used to accommodate more insulation . This has a knock-on effect whereby soffit depths must then be made deeper , as well as other building elements needing to change to fit with the new design .
Other materials and technologies can be utilised to help bring down the u-value without having to move away from traditional building methods . Insulation over the rafter is one such solution . Additionally , the use of reflective membrane technology can help to lower u-values down by creating low emissivity cavities by reducing radiant heat transfer .
New Elements in Existing Dwellings
Existing Elements in Existing Dwellings
Roofs : 0.11 W / m ² K Roofs : 0.15 W / m ² K Roofs : 0.16 W / m ² K
Walls : 0.18 W / m ² K Walls : 0.18 W / m ² K Walls : 0.30 W / m ² K
Floors : 0.13 W / m ² K Floors : 0.18 W / m ² K Floors : 0.25 W / m ² K
RoofReflex is a highly flexible product which can be used in a wide range of building designs to improve u-values by virtue of an integrated insulation layer laminated to a low emissivity surface .
Introducing Aluthermo
RoofReflex ®
RoofReflex is an insulated roof and wall underlay membrane that is both airtight and vapour open . It is fully compliant to BS EN 13859-1 and EN 13859-2 . It is CE approved as a breathable membrane and is EN 1928 W1 waterproof compliant . RoofReflex is normally used in conjunction with other standard insulation products to enhance the overall u-value of any installation .
RoofReflex is a highly flexible product which can be used in a wide range of building designs to improve u-values by virtue of an integrated insulation layer laminated to a low emissivity surface . In certain configurations the overall thickness of both the insulation and the overall construction can be reduced .
Unlike multifoil products which are used in the same application , RoofReflex doesn ’ t rely primarily on reflective technology for its thermal performance , the bulk of the product is 0.0366 W / m ² K insulation , made from 100 % recycled plastic bottles . This gives the product a true thermal value which can be used in a u-value calculator , as opposed
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