Screed thickness in underfloor heating: impact on performance and thermal inertia

The layer above the pipes acts as a thermal mass and affects the speed at which the system heats and cools the space.

Greater thickness

Increases thermal inertia and makes the system slower to temperature changes.

Smaller thickness

Can provide a faster response, but must remain within the specifications of the system and materials.

Uniformity

Proper coverage of the pipes helps in uniform heat distribution and their mechanical protection.

Design

The thickness is chosen along with the type of system, insulation, final flooring, and building requirements.