Insulate and waterproof the foundation

Insulation saves energy and reduces GHG emissions, but to be effective and reduce health impacts, it is especially important to reduce heat loss and prevent water infiltration at the foundation.

Our recommendations :

Before pouring a foundation slab, install a polyethylene membrane and rigid insulation, such as polystyrene panels. This will reduce the humidity and insulate the floor. You should also ensure that the gravel you use is certified to be pyrite-free, as otherwise it could oxidize and deform your foundation.
Spray polyurethane foam is very energy efficient if you are certain there is no water infiltration and no traces of humidity on the foundation walls. One of the most effective and economical techniques is to install polystyrene panels sealed with adhesive tape and covered with a vapour barrier on the warm side of the insulation.