You have to do it thoroughly so that the rafters sit flush on it.
Putting a roof on part of a deck.
A free standing roof needs to have posts sunk into the ground.
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Lift the box.
Using lag bolts and a screwdriver fasten the base of the posts to the ground.
Frame up a box the size of the outer dimensions of your deck using 2.
But if you have a normal roof and can control traffic on it epdm is very cost effective there is another material tpo that is an ethylene propylene rubber membrane similar in application to epdm but white in color.
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It s super tough and flexible.
So that a new structure can be installed over appropriate spots to transfer the load of the deck into the buildings load bearing frame.
If you simply add a roof to a deck not designed to support one without the right retrofitting you will be putting your family members and guests at risk.
The posts should stack directly above a support post below and not within the span of a beam.
You might want to stick with wood like the rest of your deck but some people find that makes the roof too dark and enclosed.
Build the frame of the roof on the ground.
Another good option is corrugated polyvinyl material.
If the posts supporting the roofs are placed directly on the deck structure below there are a few considerations to make.
If you want a deck with a roof build the deck with proper support whether you plan to add the roof initially or later down the road.
If it is next to a house or structure it should be secured to the siding or roof of that structure as well to keep it stable through high winds and lashing rains.
To install a deck over a roof the roofing in certain areas should be removed.
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You have to make sure that they sit plumb.
If this roof has a lot of traffic on it or is subject to mechanical damage an epdm roof will be a nightmare.
Be sure that the deck floor frame is at least as thick as the entire cross section of the post above and below.
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How to build a roof over a deck step 1.
Tie your existing deck posts into the roof by extending your corner posts with the 4 by 4 lumber.
Then subsequently the roof will then need be reinstalled and waterproofe.