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 :
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.