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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.

Centralized water supply is an integral part of a modern residential building. If the water supply system is not insulated, significant heat is lost from the hot water system, while condensation, mould and ice form in the cold-water system. There is also the risk of "defrosting" of the system – freezing water in the pipes. Modern systems require durable, reliable solutions with the easiest and most convenient maintenance during operation. Such a solution is RU-FLEX foam rubber heat insulation. The foam rubber heat insulation eliminates the risk of fungus and corrosion of steel pipes. Owing to the ease of installation and wide range of products, foam rubber heat insulation is ideal for water supply systems.

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 = 60 ˚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
57 > 5000 hours
(209 days or more) 		24.85 T25
≤ 5000 hours
(208 days or less) 		21,43 T19
76 > 5000 hours
(209 days or more) 		26,96 Т25
≤ 5000 hours
(208 days or less) 		23,47 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
57 > 5000 hours
(209 days or more) 		22,95 Т25
≤ 5000 hours
(208 days or less) 		19,52 Т19
76 > 5000 hours
(209 days or more) 		25,09 Т25
≤ 5000 hours
(208 days or less) 		21,59 Т19

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 = 60 ˚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
57 40 4,18 Т9
76 4,24 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
57 40 6,89 Т9
76 7,05 Т9

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

Calculation of insulation thickness to prevent condensation from ambient air on the thermal insulation cover layer.

Initial data

  • Heat transfer medium: water
  • tm = +5 ˚С – coolant temperature in the pipe;
  • tо = +20 ˚С – temperature in the shopping center.
  • φ = 65 % — the relative humidity in the shopping centre.

In buildings intended for permanent occupancy, the temperature of the thermal fluid does not exceed 110°C. According to SP (Construction Regulations) 61.13330.2012, thermal insulation materials of flammability groups G3 and G4 may not be used for equipment and pipework.

RU-FLEX ST technical insulation has a flammability group G1 and an operating temperature range from -200 to + 110 °C, which fully complies with the requirements of regulations and codes of practice for technical insulation in residential buildings

Without covering layer or with covering layer in different colours (PROM FORM):
Steel pipe diameter, mm Design thickness of insulation, RU-FLEX ST, mm Recommended insulation thickness, RU-FLEX ST, mm
33,5 5,11 Т6
89 5,49
159 5,62 Р9/(Т9, Р6, Р6 )
219 5,67
With foil-coated cover layer (ALU, PROM FORM silver, PROM ALU):
Steel pipe diameter, mm Calculated insulation thickness, RU-FLEX ST PROM ALU, mm Recommended insulation thickness, RU-FLEX ST PROM ALU, mm
33,5 7,01 Т9
89 7,68
159 7,93 Р9 / Т9

Calculations made according to SP 61.13.330.2012 RF


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