. The building is designed to evolve.
. In its first phase, its function is wine storage.
. In its second one it is two flats.
. We have carried out the second phase plans with all the windows and openings and all the necessary elements for water, electricity, toilets…
. The construction used wooden frame. The whole insulation is made of wood fibre, for the wall as well as for the roff.
. The blower door test has carried out and airtightness is very good (near passive house label).

The building energy consumption is 50 Kwh/m2/year = French label (BBC Effinergie).

Strasbourg low-energy block building contest

. It was special because :
A team composed of an architect, an engineer,
a heating engineer and also people interested in living in that building had be set up.
. It was something new. The fact that future owners
were inclused in the team.
. We had 3 couples for 3 flats and office on the ground floor.
. The project is located in an old area of Strasbourg and is submitted to the control of the ‘ABF’.
. The north facing façade has small openings.

. An envelope made of wood length covers the north facing façade as well as the roof.
. The wooden frame has 18 cm insulation (wood fibre in the walls) and has outside 6 cm of denser wood fibre.
. There are 30 cm wood fibre on the roof.
. The south facing façade is open with two glass walls for solar gain and has a green roof/
. There is a dual-flow mechanical ventilation.
. The little necessary heating is done thanks domestic gas.

.The building energy consumption is 50 Kwh/m2/year = French label (BBC Effinergie).


Low-energy buildings / We work in two phases :
The first phase with an ecological approach and bioclimatic principles :
– layout, orientation, passive solar gain, natural light
The second phase with active technologies
– Dual- flow ventilation, solar panels …
Consequently the heating used is very low.

1) Sun oriented buildings. Compact form
. 50% of the windows facing south. Building total glazing = 20% of the habitable surface.
. We make computer sunshine simulations. In winter the sun enters generously into the room.

2) Very efficient insulation in walls, roof and floor
. There must be a very good insulation : Wall R = 5 m2.K/w, Roof R = 7 m2.K/w,
Floor = 5 m2.K/w.
. With wooden frame we used inside the walls : Rock wool, Glass wool, wood fibre insulation, or cellulose wadding
. We make an outside insulating envelope made of polystyrene or wood fibre under the roughcast or wooden cladding.
.On the roof over the wood panels we place very dense wood fibre. That is very interesting for good thermal phase shift.

3) Thermal leaks
. With that type of buildings it is very easy to reduce thermal leaks.

4) Efficient windows
. The windows are either made of wood, PVC, aluminium or wood/aluminium.
Windows are insulated in double triple glazing :
Uglas < 1,1 W/m2 - U window < 1,37 W/m2. . If possible the roller shutter boxes are set outside. . The shutter box is hidden by the roughcast or the wooden cladding. . On the south side we put either outside blinds or shutters to be protected from the sun. 5) Airtightness . The building envelope should be airtight. It must be efficient to prevent air leakage. . Blower door tests are carried out during the construction phase. Improvements can be brought later. 6) Mechanical ventilation . We use dual-flow mechanical ventilations as well as simple flow adjustable ones. . It depends on the customer’s budget and all projects don’t need the low energy label. 7) Heating, sustainable energy . For individual houses we use wood-burning stoves or granulated wood-stoves on the ground floor. . In the bedrooms or the bathroom we place an electric radiator in case of very low temperatures. . For blocks of flats or other constructions we use low condensation gas-fired boilers.


The construction has carried out in two phases with 3 classrooms and offices.
. The project was submitted to the architect who is in charge of historical buildings (The ABF).

. The building faces south for solar gain. There is wood solar protection near the windows and outside blinds.
. The school uses timber framed construction with 16 cm thick glass wool insulation and
6 cm outside polystyrene insulation.
. The roof is insulated with 24 cm insulation and it is a green roof.
. Domestic hot water is produced thanks to solar panels.
. The school is heating with natural gas.
. The building is fitted with a mechanical ventilation (single-flow system).
. Wood cladding on the walls is natural without the use of chemicals.

.The building energy consumption is 80 Kwh/m2/year.
(In France, the rule in 2012 is still 120 Kwh/m2/year).

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