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Incognito introduces Prima Rebus™ screed for timber joisted first floors

Incognito introduces Prima Rebus™ screed for timber joisted first floors

The use of engineered joists is increasingly common in house construction. These provide challenges for the Underfloor Heating designer and fitter alike, as traditional installation methods must be adapted, resulting in increased costs and install times. As a result some contractors view radiators as a comfortable trade-off on upper floors. In response Incognito Heat Co. has developed the Prima Rebus™ system that overcomes these issues, and installation is carried out both quickly and safely.

Prima Rebus™ High quality floor screed for timber joisted structures.

Prima Rebus™  is a liquid pumpable self-compacting screed system with additional binders and additives which has been developed for use on timber joisted structures. The binders content means screed can be laid to depths as low as 40mm, critically reducing the weight load on supporting structure.

This means that that screeded underfloor heating systems are now doable on upper floors, where traditionally it has not been considered possible.    

When considering using this system, it is critical to ensure that supporting timber structure has been designed to accommodate the increased weight that is associated with the screed.

Incognito Heat Co work closely with architects and structural engineers prior to plans being submitted for building warrant to ensure this system is seamlessly designed in the fabric of the buildings super structure.

The system offers all the benefits of the cliprail system normally employed on a solid floor, on a timber supported floor. The cliprail system is one of the most common underfloor heating systems providing a quick, flexible and effective form of heating within a screeded floor build up. A 500 gauge polythene slip membrane is installed across the floor prior to fitting cliprails. Once the cliprails are secured in position, the underfloor heating pipework is laid in continuous loops and clipped down in accordance with the underfloor heating design drawings. Once complete, the system is pressure tested and witnessed to finalise the installation. Screeding follows quickly afterwards, which may be as thin as 40mm.

Incognito Heat Co. Prima Rebus™ is suitable for use over the underfloor heating system. PR screed is suited to both residential and commercial properties, and will help to improve the acoustic performance of the floor to meet or exceed Part E of the building regulations. Prima Rebus™ screed also improves the environmental, fire resistance and durability characteristics and gives a concrete feel to a timber supported floor. This system provides increased efficiency and maximises the Temperature Star Rating potential for clients installing ground and air source heat pumps.

The thinnest screeded underfloor heating system

The thinnest screeded underfloor heating system

We were recently contacted by a builder working on a residential house in Edinburgh. The client wanted the design freedom that Underfloor Heating offers, but as often happens in refurbishment projects, there was a problem.

Faced with an existing property, the external walls, ceiling, stairs and sub floor all staying in situ, the Underfloor Heating system therefore needed to have an extremely low profile.

The chosen solution consisted of the AmbiSoLo panel system and 12mm Ambiente underfloor Heating pipe. This is the low profile variant of the usual 17mm Ambiente Underfloor Heating pipe that installers love. Sturdy castellated plastic panels were laid onto a clean and primed subfloor, a high grab adhesive backing fixing the panel securely in position. The panels can be trimmed with a builder’s retractable knife to ensure a good fit.


Thinnest underfloor heating edinburgh

Full Underfloor Heating designs were created for our installation team. These full colour drawings (like in this news item) make for easy interpretation. Each loop is clearly identified on the drawings, including loop lengths. The 5 layer PE-RT pipe is stamped at every metre to take the guesswork out of the installation.

Our attention to detail is such that we include a cold form bend (like a mould) on each pipe as it enters the floor. It’s only a little thing but this keeps the manifold area tidy and helps the floor layer when the final floor covering is applied. Space was limited in the manifold cupboard, but thanks to the versatility of the stainless steel manifold, it could be spun around to allow the circulating pump and integral blending valve to be mounted on the other end. It makes our plumber very happy.

The Underfloor Heating Scotland pipework is pressed between the castellations of the floor panel, installation is quick, and we think rather neat. A thin levelling compound is applied over the whole floor to a depth of 25mm. A clever feature is a hole in the top of each castellation, which allows the screed to flood in to eliminate voids in the floor construction.   

The floor will accept most coverings; this one will be finished with a luxury vinyl tile.

Each zone in the property is fitted with a fully programmable thermostat. The client selected our wireless controls, but low voltage and mains cable hard wired versions are also available.

Read here about our new screed for first floor timber joists: Prima Rebus.

Interior photography: Photographer Stirling