Technical description

This page contains a detailed technical description of the housing complex in Riga.
Iris building complex
Total area of the residential buildings complex IRIS is 2.5 ha. The first stage of development consists of three, three-storey apartment buildings – House A (located along the frontage line of Apuzes Street (Apūzes iela)), House B and House C (located along the frontage line of Skrines Street (Skrīnes iela)). Area of the land plot of the first stage of the project is ~8564 m². It is planned to build 77 apartments of the area from 50 m² (1-room apartment) to 130 m² (3-room apartment) at the first stage of the project.
Foundation and foor slab structure
The residential buildings complex combines both quality and harmonious visual appearance. Foundations of the residential buildings complex are made of a reinforced monolithic concrete slab beneath each building, supporting walls – lightweight concrete block walls, monolithic reinforced concrete slabs, which provide a sound insulation level in accordance with the Latvian legislation. The ceiling height of the apartment is 2.8 m.
Facade of iris building
The composition and volume of the residential complex buildings were significantly influenced by the urban development and the shape of the land plot. Buildings are designed as open perimeter buildings which are located parallel to the frontage or land plot lines of Apuzes and Skrines streets. The complex of residential buildings combines a laconic but at the same time a modern and elegant design. A heating unit located above the staircase for each building section creates an architectonic accent that supplements a special visual appearance and style. The limiting structures consist of the lightweight concrete masonry blocks with a thickness of 300 mm and heat insulation with a thickness of 200 mm as well as a decorative, tinted plaster (silicate-silicone decorative plaster ( "curd" structure) 1.5 mm, white) and contrasting smooth plaster areas. The overall design of the façades will be complemented by balconies made of monolithic reinforced concrete panels of console type. Decorative elements of the façades, for example balcony handrails, will play an important role – they, along with the built-in flower boxes, will give the residential complex a romantic appearance. Buildings will not have a basement.
Apartments on the 1st floor of the residential complex will have a patio or front yard with a 2.5 m wide pavement belt along the entire width of the apartment, plus area with lawn. Front yards will run up to the borders of the land plot at Apuzes and Skrines Streets. Patio areas are intended for the use of adjoining apartment owners. The property area between the adjoining yards, patios and the inner yard sidewalk will be separated by decorative plantations, which will not only make patios more attractive visually, but will create a wonderful oasis of calm in the city. In addition, metal handrails for patios are also provided in front of the inner yard sidewalks. Each owner of the apartment will be able to arrange it at his/her own discretion, placing boxes of plantations or planting plants in the ground in the green area.
All apartments on the second and third floors of the residential building will be provided with balconies, at least one balcony with a width of 1.3 m and a length of 5.1 to 7.5 m. Wooden slats for the side walls of the balconies, will visually isolate one balcony from another. The neighbouring apartment balconies are located ~ 5 m away from each other. The balconies will be separated from the rest of the building by the elements of insulation of thermal bridges, thus preventing them from frost penetration. Balconies are made from monolithic reinforced concrete with a waterproof coating and a layer of impregnated wood. Shelters above balconies will be made of monolithic reinforced concrete slabs t = 180 mm with waterproof PVC membrane coatings.
Exterior walls
The thickness of the plastered exterior walls made of the lightweight concrete masonry block will be 300 mm with an additional 200 mm heat insulation layer. Exterior walls perfectly retain heat, provide sound insulation, and protect against moisture.
PVC windows with triple-pane selective glass are selected for the house of the residential complex. The window profiles (KBE 70 CL – EL) will be white inside the apartment, but grey outside in order to provide a unified visual appearance for the house facade. Windows provide excellent light transparency, while maintaining the warmth and providing sound insulation. KBE70 is a five-pane window profile systems that have a considerable protection against exposure to sunlight, temperature changes and other external factors. Internal galvanized fittings and steel rigidity elements guarantee a high degree of window stability. For extra safety windows are equipped with Tilt First Closure System that provides full opening of the window only by using the key that is implemented in the handle of the window. Windows ventilation function and closing is possible at any time.
Particular attention and care in the residential building project will be devoted to the roof construction. Roofs will be constructed from reinforced concrete slabs, above which a steam insulation layer will be constructed; EPS 100 insulation will be laid at a thickness of 300 - 440 mm with double stone wool waterproofing layer (t = 30 mm). The total thickness of the thermal insulation is planned to be 330-470 mm. Aerators will be installed to remove moist air and condensate from the bottom layer of the waterproofing before damage to the structures is made or stratification of the roofing material is caused. Roof parapets will be made of sheet iron and corresponding rock wool insulation.
Partition walls
Partition walls between apartments and common premises will be built of aerocrete blocks, thus providing sound insulation in accordance with the Latvian regulatory enactments. The interior walls of the apartment will be made of gypsum cardboard.
All floors of the residential complex have very good sound insulation. Floors of the first storey will be constructed on monolithic reinforced foundation slabs t = 300 mm, covered by thermal insulation of extruded polystyrene (t = 150 mm), steam and waterproof PE200 film with glued joints, fibber reinforced concrete with thickness ~ 60 - 65 mm), sub-layer suitable for laying a specific floor covering, and the floor covering (tiles or design floors). Floors on intermediate stories will be constructed from monolithic floor slabs t = 200 mm, soundproofing layer (polystyrene - 50 mm), steam and waterproof PE200 film with glued joints, fibber reinforced concrete with thickness ~ 60 - 65 mm), sub-layer suitable for laying a specific floor covering, and the floor covering (tiles or design floors).
Fire safety
In order to ensure the safety of residents, in the boiler rooms gas leak detectors will be installed which will automatically trigger an alarm and allow the timely detection of emergencies. Each apartment will be equipped with an autonomous fire detector.
Air conditioning
In order to ensure the required temperature and reduce the risk of the overheating during the summer period, cold-air and power cables for the conditioning network system will be laid. If necessary, third floor apartment owners will have a possibility to assess the installation of the air conditioning system without doing additional construction and damaging the apartment finish. Conditioning system equipment is not included in the cost of the apartment.
Boiler rooms will be built on the roof area, for each staircase separately. Wall gas condensing boilers Junkers will be used for heat supply (3 pcs in each boiler room, assembled by cascading principle), this system will ensure continuous power regulation, ensure rational gas consumption and guarantee the continuity of heating even if one of the boilers stop working. Apartment heating systems will be built from multi-layer pipes. The Purmo Ventil Compact wall radiators, fitted with thermostat heads, will be installed in the apartments. Each apartment will be provided with a heat meter, with a pulse output module, which will be connected to the central energy resource accounting system, providing individual metering of consumed heat. The floors in the bathrooms will be electrically heated, thermostats and floor sensors will provide the desired temperature and comfort at any time and season. In each bathroom, electrical outlets and a place for towel dryer is provided.
Water supply
Buildings will be connected to "Rīgas Ūdens" networks. A commercial meter will be installed at the entry of the building, but each apartment will be equipped with an electronic meter of consumed water with the M-Bus protocol, which will be connected to the central energy resources accounting system.
Power supply
The apartments will be provided with a well thought out and modern layout of switches and electrical outlets that will provide maximum comfort to the residents. The apartment will be provided with 3-phase connection to the city's electricity grids. Each apartment will have its own electricity meter, which will be located on the switchboard. The apartment will have electric outlets and lighting switches as well as connection points for kitchen appliances. The owners of the apartment will be able to choose and install the lighting fixtures according to their wishes and means. Exception is the bathrooms and the entrance zones, where built-in lights will be installed during construction phase.
Staircase and elevator
Each house will have two staircases with entrances from the courtyard. The doors to the staircase will have aluminium structures with glass glazings, which are safe and lightweight as well as visually beautiful. Each entrance to the staircase will be built without steps, thus ensuring an easy access to the residential complex with both prams and wheelchairs. Modern and quiet passenger elevators Shindler 3100™ with 480 kg load capacity (according to EN 81-20/50) will be built in the buildings.
House intercome
Exterior doors will be equipped with the access code system and the house intercom; guests will be able to communicate with the residents of the respective apartment. In the perspective of the systems used, it will be possible to install an additional block that will allow you to receive a video call on your phone (as long as there is an Internet connection in the apartment or phone), answer the call and open the door with telephone, if the owner is outside the apartment, open the door with a card, code or telephone, using a special application, give a person unlimited access to the apartment without giving him/her a card or keys.
Parking lot
Entry to the area of the residential complex is planned from Apuzes Street, but exit to Skrines Street, by organizing adequate and safe one-way traffic in the courtyard. Parking spaces for cars are planned in the inner yard and side yard at Skrines Street. Covering of the carriageway and the pedestrian way will be made of different tonality of concrete paving stones.
Lattelecom's telecommunication services – the Internet, telephone, television – will be provided in all apartment buildings. An optical cable entry will be built in each apartment.
The staircases of the residential buildings complex will be constructed in an elegant and modern design using monolith concrete stair slabs with galvanized metal handrails.
Lighting fixtures (lamps) will be installed both at the entrance and in the staircase, ensuring visibility and safety during the dark time of the day. The installed lighting fixtures will be both visually appealing and perfectly fit in the overall design as well as economic.
One ventilation system in each bathroom; two in the kitchen -one for the cooker hood, other for the natural room ventilation;