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Prospect House
- Client - Homeowner
- Underfloor heating Throughout
- 35°C Flow temperature - Perfect for heat pumps
- Screeded underfloor heating on the ground floor - Between joist system on the first floor
Requirements
Design and insall underfloor heating throughout with no build up on the first floor.
Heat Source
Vaillant Arotherm Air Source Heat Pump
Flow Temperature
35°C
Underfloor Heating System
60m² Screeded ground floor - 60m² Beween joist first floor
Initial survey and design
- When asked to provide a quotation for this project, we were excited to get involved. The homeowners’ primary aim was a highly energy-efficient system that delivered comfortable living temperatures. The ground floor would receive screed as part of the build, while the first floor already had floorboards but was accessible from below. With a Vaillant air‑source heat pump as the heat source, we designed the system with a 35°C flow temperature to minimise running costs.
.png?width=1024&height=1024&name=Untitled%20design%20(1).png "Untitled design (1)")
Ground floor solution
- The ground floor received 200 mm of Kingspan insulation over the concrete slab, topped with a Superfoil vapour barrier to add reflective properties and protect the Kingspan from screed damage. We confirmed the kitchen layout and marked areas where underfloor heating would not be installed, then fitted a foam perimeter strip to accommodate thermal expansion and protect the screed. After the preparatory work, we installed 16 mm PERT/AL/PERT pipe at 125 mm centres and connected it to a stainless-steel manifold. Following a pressure test, the system was filled with water, biocide and inhibitors to prevent corrosion and extend its lifespan.
.png?width=970&height=600&name=Untitled%20design%20(8).png "Untitled design (8)")
First Floor Solution
- The first-floor boards were already glued down so taking them up wasn't much of an option. We installed a fit-from-below between-joist system, which was ideal for this situation. Aluminum spreader plates were fixed to the underside of the floorboards, and 16mm PERT/AL/PERT pipe was routed through the joist cavities and clipped into the plates. Although installation was challenging—made more complex by the existing sprinkler system—the finished underfloor heating performs exceptionally and looks great.
.png?width=849&height=525&name=Untitled%20design%20(7).png "Untitled design (7)")