Concrete or screeded floors are the most common floor construction into which underfloor heating is incorporated. Uponor pipe has been specifically designed to be permanently embedded in a structural concrete subfloor or, more commonly within a screed. In either case, insulation is required directly below the pipework to minimise downward heat losses. The thickness and grade of the insulation varies with the particular design criteria. A clip rail system or staples can be used to hold the pipework firmly in place in line with the designed layout. Screed depth will vary according to the type of screed used, but for a sand-cement screed the depth is generally no less than 65mm with 75mm being the optimum.
Special screed additives are not required, but if used, will have no effect on the pipework.
The maximum heat output from a solid floor with a room temperature of 20°C and a floor temperature of 29°C is approximately 100W/m² of floor area. Typically, new build properties require much lower heat output.
Uponor floor heating is suitable for use in timber suspended floors. The system incorporates a thin aluminium heat emission plate with pre-formed grooves running down the length of the plate. Because joist spacings often vary in existing buildings, the preferred method is to use cross batten or to ‘saddle’ the floor at 300mm centres. Alternatively, when designing a new building, floor joists may be set at 300mm centres to minimise later work. For battened floors, a wider heat emission plate is available, which is suitable for 411mm batten centres. Please consult us for precise design details at an early stage.
The maximum heat output from a timber flooring is 70W/m² with a room temperature of 20°C and a floor temperature of 27°C.
Floating floor panels can be laid onto any existing base or over an existing timber floor. The system has a low build-height and is a dry and lightweight construction. Three thickness panels are available – 30mm, 50mm or 70mm. The pre-grooved extra high-density polystyrene panels are laid to cover the floor area; heat emission plates are inserted into grooves in the panels and then Uponor pipes are laid. After pressure testing the system, the floor deck - generally chipboard or flooring board – is laid. These must be glued together and left to ‘float’ on top of the Uponor floor. The floor finish cannot be fixed with nails or screws to the floating floor panels. Heat output is the same as for a timber suspended floor.