How do rainscreen systems on newer Vancouver homes affect exterior painting and maintenance?

Rainscreen wall systems, which became standard practice in Metro Vancouver construction after the BC Building Code updates following the leaky condo crisis, have a significant impact on how exterior painting and maintenance are approached. A rainscreen system creates a ventilated drainage cavity between the exterior cladding and the weather-resistant barrier underneath. This means the cladding itself, whether it is fibre cement, stucco, or wood, dries out more effectively than older direct-applied systems. For painting purposes, this is actually good news. Paint on rainscreen-clad buildings tends to last longer because moisture is not trapped behind the cladding causing blistering and peeling from the back side. However, there are important considerations. When painting a rainscreen-clad building, you must not seal or block the ventilation openings at the top and bottom of the wall assembly. These gaps are essential for the system to function and are sometimes located behind trim pieces or at soffit transitions. A painter unfamiliar with rainscreen construction might caulk or paint over these openings, which defeats the entire purpose of the system. For stucco over rainscreen, elastomeric coatings work well but should be vapour-permeable to allow the wall assembly to dry to the exterior. For fibre cement panel cladding, follow the manufacturer's specific paint recommendations, as using the wrong product can void the cladding warranty. Most fibre cement manufacturers require acrylic latex paint and prohibit elastomeric coatings on their products. As a next step, identify what type of cladding your rainscreen building has and request the original manufacturer specifications before choosing a paint system.

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