25 Best Deck Builders in Denver CO - HomeAdvisorComment: The deck was built with a sealed roof, and sun room below, sealed with IceLock 2 layers. However it is start to leak into the room below. Need to remove the redwood, and Icelock, to reseal. Will install composite material-plastic redwood over that. deck is 16 ft by 12 ft. plus 8 ft by 24 ft. deck is very strong, built with 6 in post and 2x12 base, and 2x8 top layer.