If you want the decking surface to be level the sleepers will need to be tapered to compensate for the slope in the roof deck.
Roof deck sleepers.
It s best to build the wooden deck in removable sections for cleaning and maintenance of the rubber roof and repair of the membrane if ever needed.
Sleepers come in a variety of materials but only wood sleepers are regularly used in deck building.
You could glue the strips tongue sleepers or just make them a bit wider and rely on pressure to keep them in place.
If pressure treated lumber is used for sleepers the grade and durability of the material should be considered prior to construction.
Deck flooring construction for rooftop decks the decking sits on 2x sleepers usually laid flat.
Sleepers must made from be rot resistant materials.
Recycled plastic lumber is often used for sleepers because it is rot resistant and should last as long as the decking material and the rest of the deck structure.
Sleepers must be securely fastened to the subsurface per codes.
Treated and untreated wood sleepers come in a range of sizes because nearly any solid piece of lumber larger than 2 by 4 inches can be used in this way depending on the size of the deck.
Concrete and metal sleepers work well for building retaining walls but these materials are too hard to attach normal deck boards to for a basic deck.
It s best to be able to clean it out often.
O recommend using a 1 4 6 4 mm plastic spacer under the sleepers to aid drainage and keep them dry.
Durable hardwood lumber sleepers work well too.
Sleepers need to be arranged to not block impede drainage flow.
Construction sleepers must be 16 406 mm oc maximum spacing.
It s a wash as the deck keeps the sun off the roof which is good but it also stores a lot of debris in under there.
Rooftop decking attaches to treated wood sleepers separated from the roofing by strips of epdm.
Sleepers must be large enough to maintain 2 51 mm spacing under the decking.