Thermal comfort means the comfort of people in a set room climate. An „acceptable thermal room climate“ is defined under DIN EN ISO 7730 as a surrounding that 80 % of its residents sense as comfortable. In general a room is comfortable if the temperature differences between

• wall surfaces and the ambient air is less than 4 Kelvin
• foot to head level is less than 3 Kelvin
• various wall surfaces (radiation asymmetry) is less than 5 Kelvin

and if the air speeds and their turbulences within closed rooms are small to avoid air draught. Hereby different uses of a room influence the individual temperature requirements.

From experience the following temperatures are comfortable»

• living room» 20 °C to 22 °C
• bed room» 16 °C to 18 °C
• bath room» 24 °C to 26 °C

An underfloor heating is closest to an ideal heating regarding the vertical heat differences. Panel heatings are energy efficient and ideally suited for the use of renewable energies due to their very low flow temperature level. They create a maximum of comfort

EFFIDUR floor systems WP consist of two preformed steel sheets that are firmly connected to each other to form a honeycomb shaped panel. These comb panels (WP) are fit as floating floor area without connection to the sub-floor, if necessary equipped with pipes and backfilled with screed with a minimum overlap in height of only 5 mm. This way an innovative, highly stable floor system is created, that can be used as floor reinforcement or equipped with pipe for heating or cooling just as required.

comb panels consist of three types»

WP 900 [14 mm total]	WP 1000 [15 mm total]	WP 2000 [25 mm total]
BASIS without heating	CLIMATE heating / cooling	CLIMATE heating / cooling
system height 9 mm [+ 5 mm SFM] Applicable for reinforcement of the old sub-floor without heating of the new floor.	system height 10 mm [+ 5 mm SFM] Especially suited for the retrofit of old buildings, where an underfloor heating is only feasible with a low building height.	system height 20 mm [+ 5 mm SFM] Advantage here» Heating pipes ø 8 mm can be crossed and other media might be integrated.

Low building height from 9 mm* flush floor finish possible for barrier-free access.

widely independent from sub-floor - unevenness of up to 20 mm can be balanced out without further works.

Reinforcement of sub-floor - highly load-bearing traffic areas feasible.

Excellent controllability - comparable to radiators through fast heat spreading of the steel panel and heating pipe close to the surface this way very short heating-up periods, ideal for temporarily used rooms, fast reaction to external heat input (solar irradiation).

Homogeneous head spreading - low temperature ripple at the floor surface already from a system size of only 15 mm, confirmed through testing according to DIN CERTCO Nr. 7F257.

Highly energy-efficient through low flow temperatures - up to 5 K lower than conventional underfloor heating, i.e. savings on heating costs of up to 10 %

Low material input - this way low static impact on the building through weight of the floor system.

Quickly ready for floor covering already after 5 days, when using system WP1000 heated, system screed SFM with a thickness of 10 mm* and under ideal ambient conditions.

Ideal for modern low temperature heating facilities, condensing boiler technology and heat pumps.

[*without screed overlap flushed for flooring with tiles and flags in middle-bed method, see detailed information at installation instructions under chapter “Backfilling with system screed SFM“.]

load-bearing behaviour of the effidur floor systems (excerpt from survey report of MPA Stuttgart)
effidur comb panel in combination with effidur system screed upon separation layer / various insulation		licit traffic loads in kN/m²**	licit point loads in kN**
	15 mm made of 10 mm WP 1000 with 5 mm system screed SFM overlap, directly borne on reinforced concrete floor	up to 5,0	up to 4,0
	15 mm made of 10 mm WP 1000 with 5 mm system screed SFM overlap, upon acoustic fleece 4 mm (CP 2)	up to 2,0	up to 2,0
	25 mm made of 20 mm WP 2000 with 5 mm system screed SFM overlap, upon acoustic panel 25 mm (CP 5)	up to 2,0	up to 1,0
	25 mm made of 20 mm WP 2000 with 5 mm system screed SFM overlap, upon acoustic fleece 4 mm (CP 2)	up to 3,0	up to 3,0
	35 mm made of 20 mm WP 2000 with 15 mm system screed SFM overlap, upon acoustic fleeces 4 mm (CP 2)	up to 5,0	up to 4,0
	When avoiding point loads in corner and border areas and subject to the applied insulation material load-bearing capacity of up to 8 kN/m² feasible
** application fields acc. to DIN 1055 part 3, edition 2002