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The dilatation solutions are applied in order to prevent the negative effects of thermal expansion of the heating pipes, which are subject to temperature changes. These include perimeter edge dilatations and dilatation gaps.
In a nutshell:
1. Edge dilatations protect the floor from the effects of thermal expansion
2. Expansion joints should be used wherever the underfloor heating is in contact with walls, columns and other vertical partitions.
3. The gap between the heating plate and the wall must be at least 5 mm.
Expansion joints in panel heating – functions
Insulations of perimeter dilatation, apart from the functions related to boards thermal motions, also serve as an acoustic and thermal insulation, which separates the boards from other perpendicular building partitions.
Floor compensators - when and where to use them
Heating plate contact points with vertical building partitions should be separated by an edge tape (spacing of at least 5 mm must be maintained). Dilatation should also be performed along the entire length of the doorway thresholds.
How to make expansion joints in screed - screed expansion tape
KAN-therm edge tape made of 8 × 150 mm polyethylene foam with laid out on the thermal insulation PE foil apron, which protects against the ingress of screed, should be applied as an edge insulation. The tape should be arranged from the floor support substrate, to the over the planned upper level of the covering, and after performing the spout, it should be cut to the appropriate height (in case of elastic coverings, should be flushed with the spout).
When are dilatation gaps required?
Heating plates distribution with dilatation gaps should be considered in the following cases:
1.The board surface exceeds 40 m²,
2.Board’s sides length ratio is larger than 2:1,
3.The length of one side exceeds 8 m,
4.Board’s surface has a complex, other than rectangular shape (e.g. types L, Z etc.),
5.Heating plate is covered with various types of finishes.
Guidelines for installing underfloor heating expansion joints
Heating plates distribution should be taken into account in the technical design.
A gap (of the minimum width of 5 mm) must separate the board’s screed from the entire thickness of the adjacent board, starting from the thermal insulation up to the covering layer.
To perform dilatation gaps, the KAN-therm dilatation profiles with feet, allowing to stick the tape to the insulation surface, are used.
Dilatation gap for stone floors - performance instructions
In case of ceramic and stone boards, the distribution of heating plates should already be adjusted to their size and arrangement at the design stage, so that the joints between the boards were located directly above the dilatation gap.
Joints in those places must be made of permanently flexible material, which is resistant to elevated temperatures.
Pipes forming the heating loops cannot pass through any dilatation.
Transit pipelines that supply individual coils, which have to cross the dilatation gap, should be protected from damage by placing them inside special dilatation profiles, which are made of tape of foamed PE, profiled rail and casing pipes of 40 cm length (the endings of those pipes should be protected against ingress of liquid screed).
