MTL Contractors👷Zack & Jesse on Instagram: "With older buildings undergoing renovations in Montreal, water always finds a way. Even with an exterior French drain, moisture can reach the foundation from above grade and under the footing. Concrete wants to dry inward, because that's the dry side. A dimpled membrane creates a controlled path to the interior French drain so moisture is collected instead of trapped in the wall assembly, where it can feed mold. #montrealcontractor #frenchdrain"