DIN EN 1264-4 PDF

Buy DIN EN WATER BASED SURFACE EMBEDDED HEATING AND COOLING SYSTEMS – PART 4: INSTALLATION from SAI Global. UNI EN The part of the standard that regulates the installation of surface- embedded radiant systems. Find the most up-to-date version of DIN EN at Engineering

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It details the minimum eh requirements to be used with a radiant surface system and the requirements that have to be met for successful installation. It is the part of the standard that regulates the installation of surface-embedded radiant systems.

This means that, whatever the procedures and choices made before the radiant surface is laid, that established in UNI EN must be complied with, without exception, when installing the radiant system. The standard describes the installation of the radiant surface, distinguishing between radiant floors, walls and ceilings.

It defines the conditions that must be present at the time of laying the radiant floor system: All the service tubing to the systems hydraulic, electrical, sanitary, etc.

It must be covered on top by a protective layer which can be a polyethylene sheet of thickness equal to at least 0. The radiant floor must be laid leaving a perimeter strip along all the walls that delimit the area to be heated.

Perimeter strips must also be left around all the structural components of the building that penetrate the screed e. The perimeter strip must penetrate down to the very bottom of the support and continue up to the finished floor level, allowing for at least 5 mm of screed movement. The perimeter strip and protective insulation layer must be positioned in such a way that the screed does not seep along the perimeter under the insulation.


The distribution manifold must be positioned in such a way as to minimise the length of supply tubing required. This is to avoid excessive supply tubing making it difficult to manage the temperature of the different rooms.

BS EN 1264-4:2009

Circuit closure and circuit calibration must be independent. These devices must also work in the absence of an electric current. It must be equipped with humidity sensors if operated in cooling mode to prevent reaching dew point temperature. The tubing used for the radiant floor circuits must have an oxygen barrier and meet the technical specifications of reference standards.

The thickness of the tubing must be such as to meet Class 4 requirements according to ISOresistant to a working pressure of 4 bar and expected lifetime of 50 years. During transport and storage on site, tubing must be protected from external damage and direct sunlight. Tubing must be laid at least 50 mm from the perimeter and mm from any possible cause of damage to the tubing e. Tubing must be attached di a secure anchoring system that ensures the tubing does not move more than 5 mm vertically and more than 10 mm horizontally from the position where it was installed.

The two lengths of tubing of each circuit that cross the expansion joint both the feed and return tubes may cross only once must be protected with flexible insulation material for a length of at diin 0.

Before laying the screed onto the coils, a pressure of no less than 4 bar and no greater than 6 bar must be applied to make sure there are no leaks. This test can be performed using water or compressed air.

The absence of leaks must be documented in a test report which must also include details of the pressure at which the test was performed. In relation to the screed, UNI EN recommends that its thickness is no less than that enn by the regulations specifying screed load capacity and bending strength class.


The screed must be laid respecting the expansion joints where necessary. Joints must be positioned – and be of sufficient number – to delimit areas not exceeding 40 m2 and no longer than 8 m. These dimensions may be exceeded in the case of rectangular areas if one dimension is no more than double the other. There must be no areas of irregular shape. Joints must be positioned by all the doors.

If superficial cuts are made to 126-4 screed, these must not have a depth greater than a third of the thickness of the screed.

BS EN – Water based surface embedded heating and cooling systems. Installation

Extreme care must be taken when laying the screed so as not to damage any of the components of the radiant floor. For at least 3 days the screed must be protected from drying too quickly. Such protection may be necessary for a longer period if the type of material used for the screed so requires it. The flooring contractor must check that the chosen floor finish is wn with the conditions.

Walls and ceilings must be able to support the radiant system. For example, in the case of an external wall, one layer will be installed directly behind the radiant system and a second layer will be installed externally. Guide to radiant comfort Efficient design Radiant cooling Regulation Norms.

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