Breathability means that masonry can absorb moisture and release it safely, rather than trapping it inside the wall. Historic buildings were designed to manage water this way long before modern sealants, membranes came around. 

 

This breathability should be taken into account during renovations. When there is too much vapour barrier, sprayfoam, brick paint and sealants applied to a building the breathability is reduced and moisture becomes trapped creating conditions for mold, rotten wood and efflorescence that never existed before.

 

Does my house need weepholes?

Modern construction uses membranes and weepholes in conjunction with the masonry walls to allow air to circulate behind the masonry to keep it dry. We get many questions about whether a home needs weepholes or not.

 

The most simple answer is:

If there is no efflorescence present on the bricks and the house originally had no weepholes, than the answer is most likely not.

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If the home was built with modern techniques using modern materials than it absolutely needs weepholes. Not just at the bottom of the wall but at the top and at every angle iron, lintel and window ledge. The air must be allowed to enter through the lower holes and then escape through the upper holes. This circular air flow is what dries out masonry walls in modern construction.

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Keeping water off the masonry in the first place

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Ideally the house itself should have elements that keep the water off of the masonry. The most common way this is achieved is by, having properly installed gutters, a proper overhanging roof, and big enough flashings with proper drip edges, Pavers correctly installed. Keeping water from absorbing into the masonry will help protect historic homes and modern homes alike from Quebec's harsh climate.