Heating system
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Residential real estate


Water enters homes through pipes of the central water supply system. The pipes pass through the structures of the building (walls, roof, ceilings, etc.). There are weak points in the structures - thermal bridges. These are places where heat is lost and condensation forms. There are thermal bridges in every building, as a result of mistakes in design, construction and choice of insulation type and thickness.

For water supply systems in residential buildings, we recommend using RU-FLEX ST thermal insulation. This material has a unique closed pore structure, low thermal conductivity and resistance to water vapour transfer. These properties resolve the main problems of the water supply system: heat loss and condensate formation.

In today's city, it is difficult to imagine a building for any purpose without thermal insulation of the heating systems. Energy efficiency as one of the main criteria for using foam rubber thermal insulation products is recognized all over the world. The correct design of RU-FLEX thermal insulation reduces significantly the cost of maintaining the required temperature inside buildings. The required insulation thickness is determined and the coating selected according to basic design rules with the help of RTK-project specially-created, certified calculation programme. Fail-safe service of RU-FLEX products for many years greatly increases economic efficiency of building operation.

To help choose the right RU-FLEX ST insulation thickness, we have prepared ready-made solutions (basic calculations).

Tasks and solutions

Calculation of insulation thickness according to normative heat flux density

Initial data

  • Heat transfer medium:water
  • tm = 95/70 ˚С – coolant temperature in the pipe;
  • tо = 25 ˚С – temperature in the shopping center.

According to SP (Construction Regulations) 61.13330.2012 "Thermal insulation of equipment and pipelines" paragraph 6.12: it is allowed to accept the nearest lower thickness of the thermal insulation layer in cases of calculation of temperature on the insulation surface and heat flux density norms, if the difference between the calculated and nominal thickness does not exceed 3 mm.

Without covering layer or with covering layer in different colours (PROM FORM):
Steel pipe diameter, mm Operating mode (24-hour or heating period) Design thickness of insulation, RU-FLEX ST, mm Recommended insulation thickness, RU-FLEX ST, mm
89 > 5000 hours
(209 days or more)
40,55/32,92 Т40/Т32
≤ 5000 hours
(208 days or less)
33,22/27,94 Т32/Т25
With foil-coated cover layer (ALU, PROM FORM silver, PROM ALU):
Steel pipe diameter, mm Operating mode (24-hour or heating period) Calculated insulation thickness, RU-FLEX ST PROM ALU, mm Recommended insulation thickness, RU-FLEX ST PROM ALU, mm
89 > 5000 hours
(209 days or more)
38,63/31,05 Т40/Т32
≤ 5000 hours
(208 days or less)
31,29/26,06 Т32/Т25

T-Designation of the tubular material.
Calculations made according to SP 61.13.330.2012 RF

Calculation of insulation thickness according to a given temperature on the insulation surface.

Initial data

  • Heat transfer medium: water
  • tm = 95/70 ˚С – coolant temperature in the pipe;
  • tо = 25 ˚С – temperature in the shopping center.

According to SP (Construction Regulations) 61.13330.2012, paragraph 6.7.1: for insulated surfaces located in working or service areas of rooms and containing substances with a temperature of 150 °C or lower, the surface temperature of the thermal insulation should not exceed 40 °C.

Without covering layer or with covering layer in different colours (PROM FORM):
Steel pipe diameter, mm Insulation surface temperature not exceeding ˚C Design thickness of insulation, RU-FLEX ST, mm Recommended insulation thickness, RU-FLEX ST, mm
89 40 11,47/6,36 Т13/Т9
With foil-coated cover layer (ALU, PROM FORM silver, PROM ALU):
Steel pipe diameter, mm Insulation surface temperature not exceeding ˚C Calculated insulation thickness, RU-FLEX ST PROM ALU, mm Recommended insulation thickness, RU-FLEX ST PROM ALU, mm
89 40 16,51/9,28 Т19/ Т13

The supply and return heat pipes in residential buildings have a heating medium temperature of +60 to +120 C according to SP (Construction Regulations) 61.13330.2012. To ensure efficient operation of the thermal insulation and to reduce heat loss, it is recommended to use insulation with a higher temperature range. RU-FLEX VT rubber insulation is one of the technical solutions that can work in a wide range of temperatures: from - 200 to + 150 C° (up to + 180 C° for a short time).

Calculations made according to SP 61.13.330.2012 RF