Rooftop deck flooring is specially designed to not puncture or tear the waterproof membrane of a flat top roof.
Rubber roof under deck.
Most modern flat top roofs are sealed with a single ply rubber membrane that is meant to protect the roof from leaks and water damage.
There is not much you can do about the slope of the roof surface.
First mark all the purlin locations on the deck joists.
Therefore allowing drainage under the deck.
Without any slope you are going to have to entirely rely on the integrity of the epdm to protect your roof.
Dexedry rubber flanges fit into flanges grooved into the edges of decking boards.
Then stretch a string between them.
Incorporate the actual support blocks into the roofing system then build the deck from your support blocks.
Lower than the purlin along the house 12 x 1 4 3.
Basicly making the support areas penetrations consult or hire roofer for this part.
Install the purlin along the house and the outer purlin.
We all know the different types of roofing material asphalt wood metal etc but there s one type of roofing material that s just a bit different than the rest.
Deck over rubber roof.
If the span under your deck is 12 ft for example the purlin at the outer end of the deck should be 3 in.
The rubber flanges are pounded into decking edges with a rubber mallet.
Michael chotiner hometips.
Although it s a waterproof roofing material it has an extra quality.
That means water will pool somewhere over such a large surface.