Question answer q how can i mount newel posts to a deck on a flat roof without cutting into the roof.
How to attach railing to flat roof deck.
Installing a porch roof over an existing deck is usually not recommended unless the deck was originally designed to support a future porch.
Porch decks require 25 additional psf for roof loads for a total of 80 psf.
For stability the sections of railing install between posts that attach to the roof.
Hopefully you have several points of contact to the home itself.
Dont let someone just bolt through the flat roof.
I ve been building wood decks with safe railings over flat epdm roofs on the rainy coast of maine for over 15 years without compromising the waterproofing.
Epdm or any type of flat roof necessary to build up.
Assuming this roof was never meant to be a deck with railings you do not have posts going through the roof.
That is how you would have been getting your strenth and support for the rails.
Build up pads to mount the blocking properly.
If you are tying the roof directly to a house wall you can install a ledger board with flashing and install rafter ties to attach the rafters at the appropriate angles or use engineered trusses.
Railings for roof decks provide safety and complement the design of a deck.
How to attach a roof deck railing.
The posts for the deck can be mounted directly to the deck framing using lag bolts so that the railings will be stable enough to act as proper fall protection.
With wooden or hot application decks attachment of the handrail posts and the ends.
Now all your strenth must come from surface mounted rail system.
Any framing toughing the deck is wrapped in either roofing felt or synthetic felt to prevent roof surface damage and protect against moisture on the deck framing.
The more solid you get the perimeter sleeper system the better off you will.
Paul nichter a contractor in islesboro maine responds.
Shed roofs project as a single plane roof pitched away from the house.
Flat roofs are more susceptible to leaking than pitched roofs.
Deckshield is a pvc flat roof deck waterproofing material designed to be slip and puncture resistant and make roof decks completely watertight.