Episode 8 - Waterproofing the roof deck - Small Space Big Build 14 Jan 2015 Episode 8 - waterproofing the roof deck - Small Space Big Build Project. Our Build. Loading. This episode showcases the waterproofing membrane being installed to the roof deck and also shows our box gutter being installed. Stay up to date How to waterproof a plywood Roof Deck. - Duration: 2:09.