Dethy - Belgium

BIM wood eco-renovation renewable energies photovoltaic reuse Circular economy

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Last modified by the author on 24/05/2023 - 09:18

Extension + refurbishment

Building Type : Collective housing > 50m
Construction Year : 1865
Delivery year : 2021
Address 1 - street : 3 rue Dethy 1060 BRUSSELS, Belgique
Climate zone : [Cfb] Marine Mild Winter, warm summer, no dry season.
Net Floor Area : 280 m² Autre type de surface nette
Construction/refurbishment cost : 385 090 €
Number of Dwelling : 2 Dwelling
Cost/m2 : 1375.32 €/m²

Primary energy need
24 kWhep/m².an
(Calculation method : Other )

Energy consumption

Economical buildingBuilding

< 50A

51 à 90B

91 à 150C

151 à 230D

231 à 330E

331 à 450F

> 450G

Energy-intensive building

General information

The DETHY project consists of the elevation and energy renovation of a single-family house in Saint-Gilles (1060), Belgium, following the principles of the circular economy. It is based on the following 4 pillars:

Eco conception;
Use of BIM and digital tools;
Objective of passive renovation;
Application of circular economy principles.

If you had to do it again?

Synthesis and feedback

One of the initial working hypotheses was that the concurrent application of the 4 pillars would bring more than if they were applied individually. It can be seen that having tackled these subjects head-on while maintaining rigor in management has made it possible to meet their respective objectives.

A logic to refine

The fairly long duration (2015 - 2021) of the project has allowed many experiments and maturations on how to approach energy renovation with increasingly constrained resources. The end of the project also coincided with the launch of RENOLUTION across the Brussels region. In connection with the objectives of carbon neutrality by 2050, this raises the following question: how to renovate in a circular approach 200,000 buildings (or 600,000 housing units)?

The equation is complex because there is obviously a lack of strength and skills at the level of companies and project managers. Not to mention the motivation and budgets of the clients. In this context, the experience of this project allows us to draw the following conclusions:

To consider large-scale renovations, one must have an extensive but detailed “building knowledge” ;
The need for maximum maintenance of the building demonstrates the importance of the inventory ;
This allows each building to have a starting point for a renovation project ;
It is necessary to speed up the renovation process, both in terms of studies and their implementation ;
In this context, digital technology can bring productivity gains ;
It must nevertheless be used wisely and not generate too many complexities of use while maintaining its effectiveness ;
Reuse is a flow of atoms that requires rigorous organisation and planning

See more details about this project

https://environnement.brussels/sites/default/files/user_files/f04_eccr_211019_1_6_dethy_fr.pdf
https://fr.focusarchi.eu/interviews-architecture/projet-dethy-avec-lionel-bousquet

BIM approach

See the explanations in the attached file in the SOLUTIONS section

Photo credit

Stephanie Roland + BXLMRS

Stakeholders

Contractor

Name : Privé

Construction Manager

Name : BXLMRS

Contact : Lionel Bousquet

http://www.bxlmrs.com

Type of market

Not applicable

Other type of market

Private

Allocation of works contracts

Separate batches

Energy

Energy consumption

Primary energy need : 24,00 kWhep/m².an

Calculation method : Other

Breakdown for energy consumption :

Heating: 5,957 kWh/year
DHW: 3,421 kWh/year
Auxiliary needs (ventilation / lighting / household appliances): 1,058 kWh/year

Initial consumption : 560,00 kWhep/m².an

Real final energy consumption

Final Energy : 30,00 kWhef/m².an

Envelope performance

More information :

See the explanations in the attached global file + PHPP

Building Compactness Coefficient : 2,21

Indicator : EN 13829 - n50 » (en 1/h-1)

Air Tightness Value : 1,80

More information

See the explanations in the attached global file.

Non-renewable primary energy consumption

Non-renewable primary energy consumption : 59,80 kWhep/m².an

Renewables & systems

Systems

Heating system :

Individual gas boiler

Hot water system :

Individual gas boiler

Cooling system :

No cooling system

Ventilation system :

Double flow heat exchanger

Renewable systems :

Solar photovoltaic

Renewable energy production : 30,00 %

Other information on HVAC :

1 single protected volume.
1 ComfoAirQ 350 DF ventilation with enthalpy exchanger for the living area.
1 DF ComfoD 300 ventilation for the office part on the ground floor.

Possibility of extending the surface of the SP from 5 to 11 panels. Planned in the next 3 to 5 years to remove the gas boiler and add an air/water heat pump.

Environment

Biodiversity approach

Planting a tree (2 if possible) on the plot
Greening flat roofs: 15 + 6 + 6 = 27m²

Mitigation actions on soil and biodiversity :

Restitution of the open ground on the ground floor courtyard (30m2)

Risks

Hazards to which the building is exposed :

Urban heat island

Risks measures put in place :

Insulation of the entire envelope from the outside except on the street facade
U value of walls less than 0.15
Increase in the thickness of insulation on the roof (40cm)
Use as much as possible of insulation with a high phase shift (wood wool, wood fiber panels)
Exterior roller shutter for south-facing roof windows
Rolling shutter for the office on the ground floor
Installation of "Nimois rattan" on the 6 frames of the south facade

Urban environment

Tram station 3 mins walk
Metro station 6 mins walk
Gare du Midi station (International traffic) 15 minutes on foot
3 car-sharing stations 3/5 minutes away on foot
Very commercial district, market several days a week
Cultural dynamics: cultural center, galleries, bookstores

Land plot area : 110,00 m²
Built-up area : 80,00 %
Green space : 30,00

Products

Product

Scan+BIM inventory

FARO et GRAPHISOFT

https://graphisoft.com/

Product category : Aménagement extérieurs / Déchets : collecte & valorisation

Use of BIM modeling of an existing building made from a point cloud to identify and quantify FLOW-IN and FLOW-OUT

Costs

Construction and exploitation costs

Renewable energy systems cost : 6 000,00 €

Cost of studies : 42 670 €
Total cost of the building : 427 760 €
Subsidies : 69 540 €

Energy bill

Forecasted energy bill/year : 950,00 €

Real energy cost/m2 : 3.39

Real energy cost/Dwelling : 475

Circular Economy

Circular economy strategy

Phase in which reuse has been integrated : Programming

Type of circular economy strategy implemented :

Maximization of the number of impacted batches
Maximization of the carbon gain
Maximization of the mass of waste avoided

Quantified targets for reuse? :

Objectives not initially set. The project has since been integrated into a study panel within the European FCRBE project. Precise data is available here (page 30) : https://www.bellastock.com/wp-content/uploads/2023/12/dt4_2_2_project-sheets_041023_lr.pdf

Integration of reuse into the written contract documents : Integration of the reuse specifically in the special technical specifications of the concerned batches

Validation protocol for reused materials : No

Validation protocol for reused materials :

Validation at the signature of the contract then by mutual agreement with the companies according to the evolution of the works.

Deposit validation form : No

Reuse : same function or different function

Batches concerned by reuse :

Structural framework
Facades
Indoor joineries
Floorings
Partitions
Isulation
Suspended ceilings
Raised floors
Landscaping

For each batch : Reused Materials / Products / Equipments :

See attached pdf document "reuse summary"

Reused materials rate :

See attached pdf document "reuse summary"

Logistics

Rehabilitation and reconditioning operations (if project concerned by a cleaning/demolition stage) : Yes

Storage of materials for reuse in situ (if project concerned by a cleaning/demolition stage) :

On site, on a dedicated area in a covered location
On site, on a dedicated area not covered

Storage of materials from external supply :

On site, on a dedicated area in a covered location
On site, on a dedicated area not covered
No problem of storage, supply correlated to the progress of the works

Insurance

Consultation of the technical controller : No

Insurance broker on the project : Yes

Insurance broker : DVV

Consultation of the broker : No

Insurer : DVV

Consultation insurer : No

Environmental assessment

Impacts avoided : water, waste, CO2 :

vertical-align:bottom; white-space:nowrap">363,7941775

Categories	CO2 avoided (kg)	Water consumption avoided (m3)	Waste avoided (kg)
Electrical equipment	122.485459	14.22242039	103.3487273
facades	2994.535	15.62705	5743,358154
False ceilings	769.6557951	11.97912206	1139.961942
Big work	368.64	3,288	468.068424
Insulation	795.0656415	10.53922396
Interior joinery	166.4	3.73369	281.2294141
floor coverings	71.34160422	15.23834671	147.1042983

	CO2 avoided (kg)	Water consumption avoided (m3)	Waste avoided (kg)
TOTAL	5288.1235	74.62785312	8246,865137

The reuse operation saved the equivalent of

42,305 kilometers traveled by a small car, i.e. 48 Paris-Nice journeys,
498 bathtubs filled with water,
16 years of household waste from a Frenchperson.

Communication

Communication on the process : Yes

If so, please specify :

Project visit : Yes

Social economy

Social economy and professional integration :

Raised wooden structure and wooden interior partition made by the Ateliers de l'Avenir: https://www.amaa.be/engagements/

Circular design

Responsible consumption :

Maximum preservation of the existing building
Maximum densification authorised by town planning = raising one level
Creation of an office space on the ground floor

Functionality economy :

Intensive use of a library of tools available in Brussels: TOURNEVIE

See attached PDF with borrowed tools

Industrial and territorial economy :

Many exchanges and reuse flows (flow-in and flow-out)

See attached PDF

Eco-design :

The following objectives were applied and achieved:

Optimised preservation of the building
Building densification
Elevation in wooden structure
Use of natural and/or biosourced insulation materials
Use of recycled materials in/off site
Implementation of PEFC wooden frames
Resource conservation

See pdf Eco-design

Sustainable supply :

Insulation of the wooden structure with blown wood wool
Exterior insulation in rigid wood fiber panels
Interior insulation in flexible wood fiber panels

See attached PDF

Additional information (PDF documents)

Contest

Reasons for participating in the competition(s)

The Dethy project was awarded the BEcircular trophy in Brussels. It is also developing a concurrent strategy on many aspects: biosourced materials, eco-design and use of digital tools (drone, scan, BIM, IFC); to achieve an optimum result in terms of sustainable and virtuous renovation.