Apartment building at 6a Rīgas Street, Valka
Multi-apartment building at Raiņa Street 5, Valka, was first commissioned in 1970. The total area of the building is 2852.9 m², it has 5 above-ground floors, 1 basement floor, and there are 42 apartments in the building. Before renovation, allocators and thermostatic regulators were not used.
Video: https://youtu.be/w8GzxLZsGDs
During the renovation, the building’s silicate brick exterior walls were insulated with stone wool boards (ƛ≤0.037 W/mK) with thickness from 50 mm to 150 mm. The reinforced concrete attic slab was insulated with loose stone wool, λ≤0.037 W/mK with thickness 300 mm. The reinforced concrete basement/floor slab was insulated with stone wool lamellas (ƛ≤0.037 W/mK) with thickness 100 mm. The roof covering was replaced with 0.5 mm sheet metal. New steel doors to the attic and new PVC doors to the vestibule were installed. Windows were replaced with PVC profile 5-chamber windows with selective coating glass units, U≤1.1 W/m²K. For waterproofing and vapor barrier, Soudal windows tape was used; for thermal insulation mounting, stone wool (ƛ≤0.037 W/mK) 30 mm thick.
The building has centralized heating supply. Heating regulation is based on outdoor temperature, with night temperature setback and individual regulation with thermostatic valves. Heat energy accounting is done individually with allocators. Hot water is prepared centrally at the heating unit. Hot water temperature is regulated at the heating unit. There is unified heat energy metering for heating and hot water preparation. Smart water meters and allocators for heating consumption control are installed.
Regular meter readings help evaluate water consumption efficiency. In the multi-apartment residential building, water consumption meters are read via a radio module connected, configured, and synchronized with installed radio antennas to ensure automated readings. With the installation of smart heating and water meters for consumption control, apartment owners can monitor their individual expenses.
Regarding ventilation, the building has ventilation with natural supply and natural exhaust; VTK-100 and/or Ventsys units are installed. Along with the comprehensive renovation, future repair costs are reduced. The renovation significantly reduces energy consumption for building maintenance. Motion sensors are installed for lighting in common areas, reducing electricity consumption during nighttime. Lightning protection and surge protection systems are arranged.
As a result of the renovation of the building at Raiņa Street 5 in Valka, heating consumption decreased from 139 to 44 kWh/m² in the 2024/2025 heating season. The achieved total heat energy savings amount to 55%. According to the provisional certificate, the building’s heating consumption is assessed at 56 kWh/m².
