In many of the inspected buildings, the hoes were clogged by the owners because they thought they were hollow joints or they wanted to prevent the insects from getting inside. These people were unaware of the existence of the chantepleures.

In order to understand the role of chantepleures in a hollow wall, one must know the components of this wall. So, the latter and composed of a masonry cladding and a wooden structure. This wall comprises two protective membranes against the penetration of rain, an external and internal protection.

Outside and inside protection

Exterior protection includes masonry assembly (bricks or stones and mortar joints, flashing and grouting joints), while interior protection is provided by the liner membrane.

Le masonry facing is not totally waterproof. During heavy rain, there is an appreciable amount of water that can penetrate the masonry facing through hollowed or cracked mortar joints, hollowed or cracked vertical expansion joints, mortar joints and bricks. All this depends on the quality of the materials and the installation, or if there are missing or cracked joints around the openings in the building envelope, or if the seals are not properly installed. or poorly sealed.

Water seeping into the masonry wall drifts down the wall, requiring a well-sealed waterproofing and drainage system at the base of the masonry wall. Thus, at the base of the wall, we find the base flashing and the chantepleures.

Basic flashing

The base flashing must start from the outside of the wall and must cover the junction between the siding and the wall of foundations. In addition, the base flashing must go up at least 6 po along the wall behind the liner membrane. The junction between the flashing and the sheathing must be well sealed.


A chantepleure is, in fact, a vertical mortar joint that is not filled with mortar. Weights must be made in the first row of the masonry, and above the openings (doors and windows), at a distance of 800 mm (32 po) between each of them. These recessed joints must be cleared of mortar residues that sometimes fall behind the masonry during construction. This to give free access to the air blade lying between the masonry and the intermediate coating.

The chantepleures play the role of a system of evacuation of the water which can infiltrate behind the masonry. If they are clogged or missing, then the water builds up behind the masonry wall and it eventually finds a way into the building. In addition, these chantepleures ensure the ventilation of the wall by letting air circulate in the void behind the masonry.

Despite the presence of weeping pipes, the amount of water that can seep through the masonry must be minimized by regular maintenance work on mortar joints, bricks, flashings and joints. exteriors.

Chantepleure at the base of the brick siding

Chantepleure at the base of the brick siding