Building a deck on a sloped roof

by John Fenton
(N.B., Canada)

I want to build a deck on a sloped roof. My plan is to open up the roof and sit a couple of 4x4 posts on top of the outside wall. How do I flash between post and roof.

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Oct 07, 2013
Get some structural engineering first
by: Johne

This is not a job for an amateur deck builder. First of all you have understand that you are now adding a load bearing structure to your roof. Your roof most certainly was not engineered to perform that way and carry that kind of load.

So as a bare minimum you should contact a structural engineer and have professional look at exactly how you plan to distribute the weight of the loaded deck with people or snow or whatever to the roof trusses and in turn to any load bearing beams or walls.

All that weight has to go down to the foundation and footings of the home ultimately.

Flashing around a post that sticks up our of the roof decking is actually the easiest part of this entire exercise. You would probably benefit from a good skilled roofer installing mechanical flashing all around just like if you were flashing a chimney.

But first, figure out the engineering on this or you will have serious problems.

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