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Case Study: nZEC - New construction of 8 dwellings in Beveren, Maalderij, Belgium

Name of organisation: Gewestelijke Maatschappij voor Huisvesting

Stage of development: in progress

Year of finalization: 2013

Type of project: construction

Area: suburban

Scale: group of buildings

Type of building: Apartment in a block of six to ten stories

Number of units/dwellings: 8

Tenure: social rental

Street: Maalderij

Postcode: 9120

City: Beveren

Region/ County: East Flanders

Country: Belgium

Last Update: 14.04.2015

Funding Certification Thermal Insulation Windows and Shading Air Tightness Heating and Hot Water Ventilation

Short Description

The dwellings consist out of factory made components for timber frame buildings. The rough structure (windproof) was built in only three weeks. Besides the short construction period there was also a focus on energy.


Key Elements

Thermal Insulation

K-value: 30


E-value:

  • Dwelling 1 (left): E62
  • Dwelling 2-7 (middle): E66
  • Dwelling 8 (right): E62

 
Construction:

  • Floor: 0,168 W/m²K
  • reinforced concrete: 17,5cm
  • Insulation XPS Knauff D350: 2x5cm
  • Screed: 4cm
  • Floor covering: 1cm


Exterior wall - 0,2 W/m²K:

  • Brick: 9,8cm
  • Air cavity: 3,5cm
  • Kingspan K12 insulation: 4cm 
  • Gyproc: 1cm
  • Hout + URSA 30 insulation: 14cm
  • Gyproc: 1cm

 
Exterior wall - 0,19 W/m²K:

  • Wood: 1,8cm
  • Air cavity between battens: 3,5cm
  • Kingspan K12 insulation: 4cm 
  • Hout + URSA 30 insulation: 14cm
  • Gyproc: 1cm

 
Roof:

  • Bitumen: 0,6cm
  • Insulation PUR: 15cm
  • OSB: 2,2cm
  • Air cavity: 24cm
  • Gyproc: 1,25cm


Ventilation

System C+: Natural supply and mechanical exhaust (demand driven).


Heating and Hot Water

Heating:

  • Central heating: located within the protected volume
  • Type: condensing boiler using natural gas
  • Test Efficiency at 30% part load: 108%
  • Radiators


Sanitary hot water:

  • Instantaneous water heater


Air Tightness

  • Air pressure testing (n50)
  • Dwelling 1 and 8: v50 = 3,62 m³/h.m²
  • Dwelling 2 t till 7: v50 = 4,56 m³/h.m²
  • Average n50 value: 2,5/h


Windows and Shading

 

Material

U (W/m²K)

Uw (W/m²K)

 

 

Profiles tilt & turn windows

PVC profile

1,7

1,6 - 2

Glas

super insulating

1

 

Profiles sliding windows

PVC profile

1,7

1,65

Glas

super insulating with g ≤ 0,38

1

 

Skylights

Velux

0,72

0,72

Glas

Velux - g = 0,52

1,1

 

Door

PVC profile

1,7

1,79

Glas

super insulating

1




Certification

EPB-calculation and air pressure testing.


Funding

  • Estimated cost: 1.003.436,88€
  • Cost by order: 1.396.606,60
  • Preliminary cost after revision: 1.406.483,54€


Main Results

Lessons learned

Additional Information

Mr Bernard Wallyn
VMSW - The Flemish Agency for Social Housing
E-mail: bernard.wallyn@vmsw.be
Web: www.vmsw.be