Case study 06 – An energy-efficient house in the Doubs

Only 1,500 kg of wood pellets required for heating

In our ‘Feedback on heating costs’ series for hempcrete houses, this is the sixth conclusive case study.

In Roche-Les-Blamonts, where temperature and weather can fluctuate considerably within the same day, there is nothing better than Tradical® Hempcrete to counterbalance these variations and ensure that indoor temperatures remain stable, leading to greatly reduced energy consumption whatever the season:

The profile of this low-energy house

  • Surface area: 100 m²
  • Altitude: 420 m
  • Climate zone: H1c

 

Construction system

  • The building rests on a 40/60 granular fill which contains all the networks. A drained hardcore layer was placed on top of this.
  • The main house, adjoining garage and extension are all built using Tradical® Hempcrete.
  • This eco-friendly building has benefited from an innovative timber framework made of vertical wall panels, making it easier to coat the structure with the lime-hemp composite.
  • This composite material was projected on the exterior, over lost formwork. Timber cladding was then added to finish the façades.
  • A hot water tank was installed for DHW
  • The house is heated by a wood pellet stove

 

Bio-based hempcrete insulation in five areas

FOR THE HOUSE

  • Tradical® Hempcrete insulating walls, where R = 4.7 m²K/W for a thickness of 40 cm
  • A Tradical® Hempcrete insulating roof, where R = 5 m²K/W for a thickness of 30 cm
  • A Tradical® Hempcrete insulating screed, where R = 2.1 m²K/W for a thickness of 20 cm

FOR THE EXTENSION

  • Tradical® Hempcrete insulating layer in the unused attic space, where R = 2.1 m²K/W for a thickness of 20 cm

FOR THE GARAGE

  • Tradical® Hempcrete insulating walls, where R = 2.4 m²K/W for a thickness of 20 cm

 

A very low environmental impact

Bilan CO2Label Bâtiment BiosourcéVolume Béton Chanvre Tradical®
19 t de CO2 captéEligible niveau 368 m3

 

Summer comfort with no air conditioning required

Example for July 2016

  • Outdoors: an average temperature of 15°C at night and 30°C in the day
  • Indoors: a daytime average temperature of 25-26°C with high outdoor temperatures

 

Thermal comfort in winter

  • Outdoors: an average temperature of 0°C at night and 9°C in the day
  • Indoors: a daytime average temperature of 22-23°C

 

Contact us!

 

In addition to this article, why not also read the five other case studies published in early 2017
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