Between Joist
Between Joist
When retrofitting an underfloor heating system to a suspended timber floor, it often makes sense to install the heating panels between the joists to minimise the impact upon existing finished floor levels. Using a between joist underfloor heating system by JUPITER, incorporating rigid aluminium heat diffusion plates (not a thin and ineffective foil), ensures that sufficient heat output is produced.
Excellent Acoustic Properties
Our between joist installations for suspended timber floors also provide excellent sound-deadening properties making the installation of hard floor coverings over party floors a possibility. We achieve this through the use of high density materials and providing multiple different densities through the construction for impact sound transmission to refract across.
Using our panels with 125 mm pipe centres it is normally possible to install three pipes between joists installed at typical 400 mm centres. The heating panels are trimmed to the correct width on site by our installation staff.
Between Joist:
Datasheet
Between Joist:
Installation Guide
A between joist installation requires that all existing floorboards are removed. If necessary existing boards can be refitted with great care.
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Preparatory work involves fixing battens to the sides of the joists and fixing strong sheet material above. We recommend 18 mm ply, especially if working on upper floors. Cut around noggins where required. For upper floor installations ensure that the ply is positioned 30 mm below the tops of the joists. The 30 mm Ideal system complies with Part-L on upper floors.
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For ground floor installations, the ply and battens should be set lower to allow for additional insulation. The thickness of insulation should be determined by the depth available between the joists.
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Ground floor installation showing primary insulation installed – still leaving 30 mm for the Ideal system above.
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Upper floor installation showing 30 mm space left for the Ideal system.
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Uneven joists can be levelled using firrings.
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Joists can also be levelled (and strengthened) using ply on either side of the joists to the correct level and then in-filled with further ply.
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Ideal panels are laid between joists so that the aluminium diffuser plate sits flush with the top of each joist. Better slightly too high than slightly too low.
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With 400 mm centre joists installing 3 pipes per void is achievable.
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Channels should be routed across the existing joists using a 20 mm router.
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The JUPITER Screed Replacement Tile system can be used on top of our between joist heating systems to support floor finishes such as wood, stone and marble.
Between Joist:
Case Study
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