Diffusion Plate System

It is installed into the building prior to wiring and plumbing. Care must be taken when installing this system in open joists, please refer to the relevant Health and Safety guidelines. The Diffusion Plate system utilises the REHAU RAUTHERM universal pipe 16mm x 1.5mm.

Diffusion Plate
The REHAU aluminium heat diffusion plates are designed for the use of underfloor heating in a joist floor application. They are manufactured from 0.8mm thick aluminium and are supplied in 1m lengths (1/2metre lengths available on request) either as:

• • Two channel
• • Three channel (to be used in bathrooms / en-suites where floor area is limited.

Both plates can be easily trimmed to length by cutting a ‘V’-shaped notch into every channel using a hacksaw. Ensure any rough edges are removed by using a rat tailed file before fitting any pipes. The pipes are tightly griped within the plates ensuring maximum heat transfer. Due to its highly conductive nature, the aluminium plates diffuse the heat evenly over the plate area. The heat is then transferred through the floor surface into the room. Standard 25mm EPS 70 floor insulation (or alternative i.e. fibreglass wool) must be installed directly below the plates to reduce heat loss.

Joist Saddle Bracket
The joist saddle bracket is designed to support the EPS insulation to the correct depth below the plates. They are fitted over the joist at 500mm centres and at each insulation joint. Please avoid air infiltration at the end of joist runs, as this will seriously affect the heat transfer.

IMPORTANT
When using the Diffusion Plate system on joists spaced greater than 400mm centres, joists must be overbattened at 90° to the joist run and spaced at 400mm centres. Battens should be 25mm x 50mm and fixed flat onto the joists. With this method, compressible insulation may be looped over the joists, to replace the 25mm EPS 70 and joist saddle brackets.