Deck Waterproofing & Drainage

For Calgary homeowners with elevated or second-storey decks, the space beneath the deck is often an underutilized area that gets soaked by rain, snowmelt, and the runoff from Calgary's frequent summer hailstorms. Under-deck drainage systems capture water that passes between deck boards and channel it away through a network of troughs and downspouts, effectively turning the area below your deck into a dry, usable outdoor space.

This is particularly valuable in Calgary, where a walkout basement patio beneath an upper deck can serve as a sheltered outdoor living area during rain or intense sun — and the under-deck ceiling panels create a clean, finished look from below.

Waterproof membrane systems take a different approach by creating a fully sealed deck surface that prevents any water from passing through to the structure below. Vinyl and rubber membranes are applied over plywood decking to create a watertight surface, commonly used for rooftop decks, balconies over living spaces, and any deck that sits directly above a room or finished area in the home.

In Calgary, where the freeze-thaw cycle can open seams and the spring snowmelt dumps significant moisture onto deck surfaces over a short period, membrane quality and installation technique are critical — a poorly installed membrane that traps water against the plywood substrate will cause rot faster than no membrane at all.

Our network waterproofing specialists carry WCB Alberta coverage and use commercial-grade drainage and membrane systems rated for Calgary's temperature extremes, UV exposure, and the heavy spring moisture load that comes with the annual thaw.