Step 2 cover the deck.
How to build a waterproof roof deck.
Make sure it s free of all dirt and debris.
A perimeter frame and graduated spacer nailers are fastened beneath the deck joists so that the plane of the ceiling slopes slightly at least 1 4 inch per foot away from the house toward the joist header.
Raintight panels made of aluminum lock together to create waterproof joints.
Once the primer dries apply the geo textile on all edges and seams on the plywood deck roof or balcony.
Any dirt and debris will keep your waterproofing sealer from sticking to the lumber.
That s unfortunate because building a reliable long lasting waterproof deck over living space is relatively straightforward when the best practices and materials are used.
For example recently a simple 3 800 deck repair turned into a 120 000 project thanks to dry rot damage to the framing shear walls and decks.
This is used to provide a durable long lasting waterproof membrane on top of your existing deck.
Use the liquid rubber deck coating under the textile to stick it to all seams.
Cover furniture or items on your flat roof deck that are not meant to be waterproofed with the drop cloth.
Step 1 clean the deck.
First you need to purchase a continuous sheet of epdm which will cover the entire deck area.
The costs can be astronomical.
Clean off the dust then apply the primer to the entire surface with a large paint brush.
Epdm is available in widths up to about 50 so you can generally lay down a continuous sheet without any seams.