Water Tight Decks Dec, 2016. Call Portland Roof and Deck for all your roofing and decking needs. 971.221.5495.We here at Portland Roof and Deck have been building and repairing improperly built water tight decks for about a decade. Portland Roof and Deck have seen all different kinds of products used to make a deck water tight.We used a product back in the early stages called Spantex. it was originally a oil based product. But now it is water based and you apply multiple layers onto the decking surface. It took a long time to dry, so it was not a good fit for here in Portland unless you could do it in the summer months. Most deck construction or new house construction can not wait for a week of dry weather.We now use a product called DeckRite. It comes in a 5 foot roll and you glue it onto the deck surface. We then heat weld the seam together. Can be done installed in about a day once the surface is ready.Water Tight Decking in Portland.Portland Roof and Deck.Why are you hesitating? We are one of the best decking companies in Portland, so call us now for a free estimate.503.465.4940.