They are merely placed on top of another structure.
How to frame a deck roof.
Before you begin make sure you re matching the house roof pitch angle and overhang for your roof.
Frame up a box the size of the outer dimensions of your deck using 2 by 4 inch lumber.
First you must make sure the roof is strong enough to support 55 lbs per square foot.
2 fix these support posts to your decks original support frame bolts work well.
Step 1 build the frame of the roof on the ground.
If you like the idea of having the roof above your house s roof you need to make sure the support posts are within 4 feet or so of the original gutter on that side.
Building a deck over a flat roof is very similar to building a deck over a concrete patio.
Be sure that the deck floor frame is at least as thick as the entire cross section of the post above and below.
Install post base connectors.
The posts should stack directly above a support post below and not within the span of a beam.
If the posts supporting the roofs are placed directly on the deck structure below there are a few considerations to make.
Then run joists connecting the front of your roof with the rear every two feet along the length of your roof.
These decks are often referred to as floating as they are not secured in place as a stand alone structure.