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Influence of the density of plates for a water-heated floor made of expanded polystyrene on the main physical and technical characteristics of the plates.
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New requirements for energy efficiency. Passport of energy efficiency of buildings and structures
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Properties of expanded polystyrene used for the manufacture of slabs for underfloor heating
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How to tell if an underfloor heating slab is made of low density expanded polystyrene
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What are the consequences of using low-density polystyrene foam boards for underfloor heating?
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Criteria for choosing slabs for underfloor heating
This article will discuss the correct choice of a slab for a warm floor and the effect of the density of polystyrene foam on the quality of the slabs.
New requirements for energy efficiency. Passport of energy efficiency of buildings and structures
According to the Order of the Ministry of Construction of Russia. N 1550 / pr dated November 17, 2017 «On approval of the requirements for the energy efficiency of buildings, structures, structures», entered into force on April 6, 2018, establishes requirements for buildings, structures and structures aimed at energy saving and increasing energy efficiency in the construction complex of the Russian Federation.
Document introduces obligatory fulfillment of energy efficiency requirements for architects, developers, engineers, designers, installers of plumbing systems.
The order of the ministry provides for a gradual reduction in the specific consumption of thermal energy for heating for newly built and reconstructed buildings, structures, structures, including apartment buildings. The volume of heat and energy required for heating new buildings will have to decrease by 20% from July 1, 2018, by 40% from January 1, 2023, and by 50% from January 1, 2028.
Each facility must have a Building Energy Efficiency Passport confirming the energy efficiency class. Required to obtain permission to put the facility into operation, a document. This may be required from you by regulatory authorities or home buyers.
Compliance with the requirements of the order should be ensured by high-quality building materials with enhanced thermal insulation properties.
Properties of expanded polystyrene used in the manufacture of slabs for underfloor heating
For underfloor heating slabs made of expanded polystyrene with a film coating of polystyrene film, the most important factor to ensure high thermal resistance, Rm2*K/W. compressive strength and low water absorptionis the density of expanded polystyrene. Unfortunately, assembly and purchasing organizations often do not pay attention to this factor, which allows boards with low density and insufficient thermal insulation, compressive strength and water absorption properties to enter the market.
Below are plots of thermal conductivity λ and compressive strength versus density.
The higher the density of expanded polystyrene, the lower λ is the thermal conductivity of the boards W/(m·K). The lower the thermal conductivity, the higher the thermal insulation or thermal resistance, R m2 * K / W. The most ideal density at which low thermal conductivity and optimal thermal insulation is achieved is 30 kg / m3. A further increase in density is impractical since the cost of raw materials increases and the thermal insulation increases slightly
For reference: Thermal resistance, R m2 * K / W is calculated by the formula 
where ∂ is the plate thickness and λ is the thermal conductivity of the plates W/(m K),
The compressive strength at 10% linear deformation, kPa, has a direct dependence on density, the higher the density, the higher the compressive strength.
How to tell if an underfloor heating slab is made of low density expanded polystyrene
Below are the parameters by which low density can be determined.
Characteristic features of the underestimated density of expanded polystyrene are:
— coarse granule structure
— visible voids between the granules
— insufficient strength
— a light weight
Recesses remain on the plates with slight compression, the plates are easily bent and destroyed, the granules are easily separated from the plates.
examples of low and high density boards
What are the consequences of using low-density polystyrene foam boards for underfloor heating?
Low-density expanded polystyrene slabs have not only low thermal insulation performance, but also low strength performance and increased water absorption. The slabs can sag under prolonged load, which can cause cracks in the floating screed and, accordingly, in the floor covering during the operation of the floor. These cracks are especially clearly visible when laying ceramic tiles on the screed.
When purchasing slabs for underfloor heating, it is necessary to pay attention to the density of the purchased slabs for underfloor heating.
Unfortunately, there are unscrupulous suppliers who, in order to obtain super profits, underestimate the density of the supplied boards by 2-3 times, knowing full well what negative consequences this may have for the end user. Such plates do not meet the current GOSTs and the properties declared by the manufacturers themselves.
The operating cost of underfloor heating increases due to the use of a higher temperature coolant. This is approximately extra 400-500 rubles per month for a room of 50 m2. I recommend consulting with your designers about this.
An increase in water absorption, given that the screed concrete has a large amount of water, leads to a sharp deterioration in thermal insulation properties.
According to GOST 15588-2014, flooring requires the use of PPS 25 boards with a density of 25 kg/m3.
Criteria for choosing slabs for underfloor heating
Supplied plates must comply with GOST 15588-2014
Interstate standard foam polystyrene heat-insulating platesProducts made of expanded polystyrene PPS (EPS) used in construction
Below is a table from GOST 15588-2014
Important! For application on the floor under the screed, it is necessary to use expanded polystyrene boards with a density of at least 25 kg/m3
The underestimated density of expanded polystyrene worsens quality of plates.
As a result, there is a significant infringement of the rights of consumers who do not receive the required properties of the plates, as well as the rights of manufacturers who fundamentally do not follow the path of reducing density, realizing that this will damage the quality of the product and may lead to a deterioration in the image of the product in the sanitary ware market.
Ask your suppliers for underfloor heating boards with a density of at least 28 – 30 kg/m3
Do not allow low density boards to be supplied at your expense. This will lead you to reputational risks and possible fines due to the discrepancy between the real efficiency of the warm floor, declared during the design and conclusion of the contract.
Plate for underfloor heating Ekopol www.thermobox24.ru due to the use of high density expanded polystyrene fully comply with the new requirements for energy efficiency.
The material is placed on the rights of advertising by the company «Avtoplast».
Source: Company «Avtoplast»
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