46 INSULATION
few factors to consider during specification. Some materials will only be suitable for use on the internal side of the tanking membrane, to avoid exposing them to the ground and moisture. XPS insulation with a compressive strength of 200 or 300 kPa (Kilopascals) can be installed outside of the basement structure and tanking, providing a continuous thermal envelope for the below-ground structure and resisting the loads imposed by the ground.
At the high end of the market, XPS is also ideal for use around swimming pool basins, resisting the loads imposed by the volume of water, and hitting the U-value targets specified in Building Regulations.
Extensions to existing buildings can use the floor dimensions of the new build area only, or the complete building including the extension.
The same standard specifies how U- values should be calculated for basement walls and floors, taking into account the same criteria, while also factoring in the depth of the structure below ground. The calculation of heat loss through a basement wall also considers the insulation specifica- tion of the basement floor, so it makes
sense to consider any basement design holistically.
BASEMENT DESIGN Basements are seeing a resurgence in residential developments. This is particu- larly true of refurbishment projects, as a result of limited available space to construct above-ground extensions. They can however cause problems if not properly designed and built. Insulation plays a key role in basement design, and there are a
FUTURE-PROOFING With tightening regulations and higher energy efficiency targets to meet in the coming years, it’s more important than ever to liaise with a trusted XPS insulation manufacturer which will offer a technical and specification advice, ensuring the building performs as per the specification.
Karen Everitt is marketing manager at Ravatherm UK
Construction membrane delivers thermal efficiency and insulation cost savings
a CE marked, highly reflective insulating breather membrane designed for use within a timber frame wall panel to enhance its overall thermal performance. Ideally suited to offsite and modular construction, Protect TF InterFoil features a low emissivity, vapour permeable reflective surface, using the tried and tested technology of TF200 Thermo, which can be installed either side of the insulation in conjunction with a 20mm air cavity. This means the building developer and fabricator can move from more expensive, rigid high-density boards to fibrous or EPS insulants without increasing panel sizes, thereby achieving material cost savings. When Protect TF InterFoil is used with
P
Protect TF200 Thermo insulating breather membrane on the external face of the sheathing board and Protect VC Foil Ultra insulating vapour control layer on the warm side of 100mm 0.032 lambda insulation within a typical 140mm deep timber stud section, the overall wall construction can achieve U-values as low as 0.18W/m2
K. This meets the more onerous Fabric
WWW.HBDONLINE.CO.UK
rotect Membranes, UK producer of roofing and construction membranes, has introduced Protect TF InterFoil,
Energy Efficiency requirements detailed in Building Regulations Part L1A. John Mellor, Product Manager comments,
“With the ongoing material supply and price instability of PIR rigid board insulation, using Protect TF InterFoil as part of a timber frame or modular wall system offers opportunities to make meaningful material savings whilst retaining low U-values, without increasing the size of their panels. Our Technical team offers a full U-value calculation service to demonstrate how using Protect TF InterFoil can benefit the overall build.”
Available in different roll sizes, including 2.4m and 1.2m widths and 100m lengths, Protect TF InterFoil is installed with the Protect Cavit-E Tray, an insulation spacer designed to create the 20mm low emissivity airspace within the depth of the wall stud on either or both sides of a fibrous insulation. Alternatively, EPS insulation boards from
Jablite (JTWS-TF) have integral ribs on both sides which create the required airspaces.
info@protectmembranes.com www.protectmembranes.com/tfinterfoil
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