Without any slope you are going to have to entirely rely on the integrity of the epdm to protect your roof.
Rubber roof under deck.
There is not much you can do about the slope of the roof surface.
Michael chotiner hometips.
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.
Basicly making the support areas penetrations consult or hire roofer for this part.
Dexedry rubber flanges fit into flanges grooved into the edges of decking boards.
First mark all the purlin locations on the deck joists.
That means water will pool somewhere over such a large surface.
Comments for building a floating deck on an epdm rubber roof surface.
There are several commercially available under deck drainage systems including some that can be retrofit to an existing deck but on new decks i prefer to fabricate my own system using an epdm synthetic rubber roofing membrane and standard aluminum gutter parts.
Rooftop deck flooring is specially designed to not puncture or tear the waterproof membrane of a flat top 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.
Then stretch a string between them.
Dexedry flanges are designed to act as spacers between boards and also as mini gutters to channel water toward deck edges.
Lower than the purlin along the house 12 x 1 4 3.
Although it s a waterproof roofing material it has an extra quality.
The rubber flanges are pounded into decking edges with a rubber mallet.
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.
Install the purlin along the house and the outer purlin.