Eco-renovation of an ancient farmhouse and its attached garage
Here are the stages in the project to go from a near-ruin to a comfortable holiday retreat fostering a low-carbon lifestyle :
The landscape gardeners took to the stage and transformed the landscape. Rip-rap retains the slope and Japanese steps allow the two levels of the hamlet to communicate with each other from the outside. The laurel hedges were removed: they were invasive, non-endemic and of little interest for biodiversity. This opens up magnificent views over the bocage. A new access was created to separate the agricultural area from the house.
The boiler room is complete. A leak was identified when the air was put in (before the water was turned on). To re-supply the affected manifold, a chamber will have an apparent but discreet pipe. A lesser evil. We opted for a wood pellet boiler rather than a heat pump, which would not have been sufficient to supply the entire site.
The reed filter for the phytosanitary treatment of the site has been installed. The reeds will draw their nutrients from the grey water, and after several passes, the clear water will be discharged into the stream. This is another measure put in place to preserve the site's natural resources.
Work is progressing on the laundry room, which will have an uninterrupted view over the bocage. The stages in order: pouring the screed, laying the tiles, installing the insulation and plasterboard, painting, installing the electricity meter. The kitchen fitter will install the units at the beginning of March, with the remaining work to be done on the credenzas. The pump for collecting rainwater to supply the toilet flushes will also be in the utility room.
The steps from the living room to the bedrooms and the courtyard have been installed. Made to measure in oak by the joiner Coudronniere.
A one-day community project to coat the wall of the living room, insulated in August, with lime, hemp and sand. See the lime/hemp blog.
A two-day community project to insulate a lounge wall in hemp/lime. 6 volunteers and 2 technical coaches make up an A-team! See the lime/hemp blog.
The plasterboard installation is progressing. Plasterboards must be cut to fit the stone wall as closely as possible. All the electrics and plumbing are routed behind the plasterboard, and need to be marked out so that the switches, lights, radiators and other taps can be installed once the painting is done.
Repair of a wall section that collapsed during the removal of the cement coating. Each stone is selected according to its shape, laid according to its face and wedged with smaller stones.
An old door converted into a window can be seen. One of the many evolutions of the house over centuries to adapt to the inhabitants' needs.
Two windows are pierced in the south gable, which had none. This is an opportunity to see how ancient stone walls were made. The stones are interlocked and mixed with red earth. Did you know? The word "parpaing" originally referred to a stone that stretches from the outer side to the inner side of the wall..
The frame arrives as parts by semi-trailer. It's not easy to manoeuvre around the bend. The carpenters assemble the trusses on site, then use the crane to lift them onto the concrete supports cast at the top of the walls. Then all four walls will be linked together - with concrete again, as required by anti-seismic regulations...
The scaffolding is erected to gain access to the roof, a fairly long and tedious process. In Hong Kong, scaffolding is made of bamboo, which is very light and can be erected very quickly, but it's a skill that is being lost. While clearing the ground to install the scaffolding, a terracotta tile floor appears. The tiles were laid directly on the ground, which must have meant poor insulation.
The concrete slab is poured using a pump powered by a concrete mixer. The pump has a long arm that enables it to get to hard-to-reach places. The concrete is then smoothed with a tamping bar. In the future bedrooms/shower rooms, cardboard wedges were placed along the walls to separate the slab from the wall. In this way, any residual seepage water that might run under the wall will drain away through the gutter.
To reroute the water running under the house, a trench close to 2 m deep was dug in the future living room to lay a drain (left) that will run under the terrace.
A draining sheet is also laid over the entire surface of the downstairs bedrooms and the living room. This sheet (black in the photo) is lined with small tubes that capture the water and direct it to a central drain, which in turn brings the water to the outside.
Drainage pipes are laid, then covered with a mixture of sand and gravel. The empty blocks are future concrete blocks to support the staircase and a retaining pillar. The hot water, cold water and heating pipes are in place. Two pipes are needed per sink/shower/bathtub/radiator, including for the shower rooms on the first and second floors.
Thanks to heavy rains, a water vein running under the houe appeared during the excavation of the future bedrooms (video). The house is on a hillside and built on schist rock. The water therefore seeps easily and runs over the rock. A trench was dug in the living room, above the bedrooms, and the water vein was found close to 2m deep. A solution has to be found to drain the water before and after the wall.
The future living room was originally just a beaten earth garage. Part of the roof had collapsed, but the stone walls are superb.
The ground was scraped to check that the rock was not immediately below and that excavation could take place. A buried wall was discovered 30cm from the main wall. Its purpose is to support the main wall but also to allow it to breathe by keeping a thin layer of air between the two walls. The breeze-block wall at the back of the room was knocked down. The roofing sheets were also removed to allow for the future removal of the frame.
All joinery was removed (doors, windows) and reused locally. The staircase was removed.