Before installing a roof deck you must be certain the roof is stable and weatherproofed.
How to build a rooftop deck on a sloped roof.
A deck on a sloped roof requires a different approach to the framing underneath the joists.
Careful detailing of membrane roofs at corners doorways and penetrations is critical for long term performance.
Some key details for a leakproof rooftop deck are.
How to build a deck roof.
Tie your existing deck posts into the roof by extending your corner posts with the 4 by 4 lumber.
Much of the work that s being done here is identical to what you would see on any deck built in a suburban backyard.
This is usually because low quality leak prone decking materials such as epdm rubber are used often in an effort to save money.
Unfortunately many homeowners who have a flat deck roof have to deal with frequent leaks.
Epdm is the best choice for most rooftop decks.
If the span under your deck is 12 ft for example the purlin at the outer end of the deck should be 3.
The roof deck surface should sloped away from the house a minimum 1 8 inch per foot so the water will.
Building a deck over a flat roof is very similar to building a deck over a concrete patio.
Building a deck on a sloped roof.
First you must make sure the roof is strong enough to support 55 lbs per square foot.
Plan to space the 2x4 purlins parallel to the house and 3 ft.
Instead a pair of beams rest on supports called sill plates to create a frame for the deck.
They are merely placed on top of another structure.
These decks are often referred to as floating as they are not secured in place as a stand alone structure.
My plan is to open up the roof and sit a couple of 4x4 posts on top of the outside wall.
Roof deck framing unlike for decks at ground level doesn t entail a ledger attached to the rim joist of a house.
Of roof decking costs 800 2 800 to install depending on the material you choose.
To provide drainage the panels should slope toward the outside edge of the deck about 1 4 in.
Since most roof decks are floating structures that sit on top of flat roofs it s crucial to weatherproof the roof below the deck to prevent water from seeping into the home.
Make the front of the roof the height of the house roof you are presumably tying into with the rear sloping at a rate of six inches over two feet.
One of the challenges in building a deck on a roof like this that s unlevel is the deck needs to be level.
Photo by dave holbrook.
The roof must be able to support 55 pounds per square foot at a minimum.
By john fenton n b canada i want to build a deck on a sloped roof.
But the rooftop location does offer some unique challenges particularly in regard to the deck s foundation.
Hardwood decking is then fastened to tapered pressure treated sleepers that rest on additional strips.
Building a deck above a porch roof allows for sheltered space below and views from above.
