TOWARDS CLIMATE NEUTRALITY IN CONSTRUCTION PROJECTS WITH RETANOL® SCREED

THE 3 DECISIVE FACTORS FOR APPROX. 110 KG/M² LESS CO₂ EMISSIONS:

In combination with underfloor heating, among other things, the screed is the decisive influencing factor in reducing CO₂ emissions during the construction and later use of the building. The short heating phase, reduction in nominal thickness and increase in energy efficiency of the underfloor heating enables CO₂ emissions to be reduced by approx. 10%.

REDUCTION OF CEMENT QUANTITIES

The cement industry is mainly responsible for the global production of CO₂, accounting for more than 6 - 7 % of annual global CO₂ emissions. With the new Reducer® product line, PCT Chemie has succeeded in reducing the amount of cement used and thus cutting CO₂ emissions by up to 48%.

1st step:

Switching from CEM I cement to CEM II cement reduces CO₂ emissions by 35% because a CEM II has a second main component that is less CO₂-emitting.

2nd step:

With the Reducer® line, the amount of cement can be reduced compared to an untreated screed. In the example of Retanol® Reducer 48, this reduces cement and CO₂ emissions by 20 %.

REDUCTION OF NOMINAL THICKNESS

By reducing the nominal thickness, a Retanol® screed can save up to 69 % (Xthinn NeaTherm) screed mass compared to an untreated screed. By increasing the bending tensile strength up to an F9, the nominal thickness can be reduced while maintaining the same surface load.

At 5 KN/m² and the change from an F4 untreated screed (50kg cement) to an F5 Retanol® screed (55kg cement), the nominal thickness can be reduced by 20 mm and thus the screed mass by approx. 27 %.

By using Retanol® Reducer 48, the amount of cement can be reduced by 20 % to 50 kg compared to the untreated screed.

This saves you the following raw materials:

27 % sand
27 % cement
27 % CO₂

NOMINAL THICKNESS REDUCTION WITH 5 KN/M²

Here is a calculation example:

Type of screed	Cement kg/mixture	Cement kg/cm	Nominal thickness in cm	Cement quantity/m²	CO₂-Emission/m²	Savings
Untreated screed F4	50	2,5	7,5	18,75	7,20
Retanol® Reducer 48 F5	50	2,5	5,5	13,75	5,28	–27 %

REDUCING HEATING COSTS WITH EXTERNAL HEATING SOURCES

CO₂ REDUCTION IN THE HEATING PHASE WITH EXTERNAL HEATING SOURCES

Before starting the floor covering work, functional heating is carried out in accordance with DIN EN 1264-4 to confirm the function of the underfloor heating. The screed is then exposed to the preparatory heat-up phase to support the drying process. The preparatory heating is carried out until the screed is ready for covering. This heating process takes at least 26 days and is absolutely essential for the continuation of the construction process in preparation for the flooring covering work. In more than 50 % of cases, the planned energy supply, e.g. from district heating or a heat pump, is not available. In order not to interrupt the construction process, external heaters are employed in these cases. External heaters, whether oil or electricity-powered, are inefficient in terms of energy utilisation and therefore costly, as energy consumption is comparatively high. With RetanolL® screed, the heating phase can be reduced to 4 days, which reduces CO₂ emissions by approx. 80%.

Assumptions:
Machine utilisation of 80%, oil costs of €3/L, electricity costs of 50 ct/kWh

			Retanol®		Untreated screed
Heating source	CO₂-emission/m²	Heating days	CO₂-emission/m²	Heating days	CO₂-emission/m²	Reduction of CO₂-Emission/m²
Oil	0,9 kg	4	3,6 kg	26	23,40 kg	–19,8 kg
Electricity	1,22 kg	4	4,9 kg	26	31,70 kg	–26,8 kg

ASSUMPTIONS:

Oil consumption per m² and day 0.3 litres
Power consumption per m² and day 2.9 kWh

CO₂ DURING OPERATION E.G. DISTRICT HEATING WITH 5% LESS CONSUMPTION:

A Retanol® screed increases the energy efficiency of underfloor heating and reduces energy costs and the associated CO₂ emissions.
In residential construction, CO₂ emissions can be reduced by between 7.5 and 10% with energy efficiency classes EK 1 and EK 2.

REDUCTION OF CO₂ EMISSIONS FOR 50 YEARS WITH RETANOL® EK 2 FOR DISTRICT HEATING

Expressed in figures, a Retanol® screed and a district heating connection reduces CO₂ emissions by 100 kg/m² over 50 years, based on approx. 10 % energy savings with EK 2.

Screed	Emissions/m²	Reduction/m²
Untreated screed	1.000 kg
Retanol® Screed	900 kg	100 kg/m²

REDUCTION OF CO₂ EMISSIONS OVER 50 YEARS WITH RETANOL® EK 2 WITH HEAT PUMP

Expressed in figures, a Retanol® screed and a heat pump CO₂ emissions are reduced by 86 kg/m² over 50 years, based on approx. 10 % energy savings with EK 2.

Screed	Emissions/m²	Reduction/m²
Untreated screed	856 kg
Retanol® screed	770 kg	86 kg/m²

REDUCING HEATING COSTS DURING OPERATION

More Retanol® for more sustainability

As a responsible and forward-looking company, the confirmation and verification of PCT products with regard to health and sustainability requirements is of vital importance.

The Retanols were therefore tested for harmful substances and the absence of emissions. This in turn is the basis for DGNB certification. Retanols therefore fulfil all sustainability and environmental compatibility requirements.

Retanols also react without leaving any residue except for the marker in fluorescence analysis and can therefore be treated like an untreated screed when removed.

DOWNLOAD GEV certification (EMICODE)

DOWNLOAD TÜV EMISSION TEST

1. Cement quantity