The costs can be astronomical.
How to build a waterproof roof deck.
Any dirt and debris will keep your waterproofing sealer from sticking to the lumber.
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.
Once the primer dries apply the geo textile on all edges and seams on the plywood deck roof or balcony.
Clean off the dust then apply the primer to the entire surface with a large paint brush.
Raintight panels made of aluminum lock together to create waterproof joints.
Make sure it s free of all dirt and debris.
Epdm is available in widths up to about 50 so you can generally lay down a continuous sheet without any seams.
This is used to provide a durable long lasting waterproof membrane on top of your existing deck.
The roof deck should be properly flashed with a.
Step 1 clean the deck.
Step 2 cover the deck.
Use the liquid rubber deck coating under the textile to stick it to all seams.
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.
Cover furniture or items on your flat roof deck that are not meant to be waterproofed with the drop cloth.
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.