PSI Values

Importance of detailing at junctions

By the adoption of good practice at the design stage there are considerable savings to be made in the amount of heat lost through bridges at critical junctions in houses. Around 30% of heat in the fabric of a typical house can be lost as a result of thermal bridging.

Longley Floors and Springvale EPS promote good practice in the use of all of its EPS flooring products and can provide Psi values for Beamshield Plus in both masonry and timber frame constructions.

Some of the critical aspects of a floor wall junction incorporating Beamshield Plus are detailed below. Springvale use state-of-the-art Trisco Physibel software to model floor/wall junctions to specifically reflect the type of beam, beam layout and thickness of Beamshiled Plus in the floor. The thermal graphics shown below demonstrate how good detailing has prevented a cold bridge at the floor/wall junction.

Wall U value0.25 W/m2K
Inner leaf value (Grey)0.11 W/m2k
Floor U Value0.15 W/m2K
Foundation walls (Blue)0.19 W/m2K Lightweight block etc
Cavity wall insulation (Yellow)Extends to base of cavity or 300mm from top of Beamshield
Perimeter insulation (Cerise)30mm Platinum

beamshield 2

Thermal Graphics – 3D Thermal Analysis
Modelling of critical junctions

Physibel software 2D (BISCO) and 3D (TRISCO) is the state-of-the-art method for accurate calculation of heat transfer through complex junctions. The graphics below demonstrate where cold bridges occur, and the program itself offers the modeller the opportunity to solve bridging issues well before building designs are finalised.

As you can see below good practice in the design of wall/floor/foundation junctions can eliminate costly heat loss at junctions and give both the developer and SAP/Code assessor alike confidence in the performance of Beamshield Plus.

Wherever a Beamshield Plus suspended insulated infill floor is to be used Springvale EPS will be pleased to advise the most effective ways of achieving good U and PSi values. The thermal graphics shown below demonstrate how good detailing has prevented a cold bridge at the floor/wall junction.

Reduced Beam Centres                                                          Multiple Beams
psi-1-v2         psi-2-edit

 

Party Walls
psi-edit-3         psi-edit-4