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    Green Roof

    I am designing a green roof, I have the roof setup as the following: (from the bottom up)

    Concrete roof deck
    Insulation layer (about 1" of styrofoam like material)
    Waterproofing build up layer (about 6" thick)
    Air Layer (1/2" thick)
    Root barrier membrane (4mm thick or about 1/8")
    Reservoir sheet (1 5/8" thick) - actually looks like some egg crate
    Followed by either - gravel rock / pavers / "growth media" (I assume to be dirt) and grass all of these are in the general category of 3" deep

    Here is my conundrum.... I am installing power throughout the roof area and I need to run conduits. My overall depth is generally about 12 inches. I can not run my conduits in the insulation layer as it will cause condensation issues on the slab in the space below (which is already at a VERY high humidity), the client understandably does not want roof penetrations all over the place for the multitudes of receptacles that I need to place everywhere. Would this application even be considered direct burial? There is no AHJ to go to and ask, I have to derive this through the NEC and tell them. I plan to install all schedule 80 PVC (but that can change). Any advice is greatly appreciated......

    #2
    Air layer? How do you do that? And does it double for drainage?

    I would imagine that either in the reservoir layer would be least disruptive. Or else in the rock/growth medium and hope it does not get dug into later?

    Comment


      #3
      Roof pyramids?

      https://m.erico.com/category.html?ca...us&language=en


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      Comment


        #4
        I think this is supposed to look like a landscape, not a roof.

        -Hal

        Comment


          #5
          I would guess all of your roof penetrations can be confined in one specific area of the roof then use roof pyramids as Brant has suggested and install it on the reservoir layer as GD suggested.
          Edward
          The only thing I know, is the progressive discovery of my ignorance

          Comment


            #6
            I'd say the burial depth requirements don't apply.

            I think its safe to say nobody should be digging deep enough to get into the insulation or roof membrane, or anything under the top layer of growth material.

            And its very unlikely there will be a backhoe or bulldozer or anything similar on top of the roof like you might normally have with buried conduits and cables.

            I'd use conduit and not worry about the depth requirements in 300.

            Comment


              #7
              Originally posted by sheldonrf View Post
              I am designing a green roof, I have the roof setup as the following: (from the bottom up)

              Concrete roof deck
              Insulation layer (about 1" of styrofoam like material)
              Waterproofing build up layer (about 6" thick)
              Air Layer (1/2" thick)
              Root barrier membrane (4mm thick or about 1/8")
              Reservoir sheet (1 5/8" thick) - actually looks like some egg crate
              Followed by either - gravel rock / pavers / "growth media" (I assume to be dirt) and grass all of these are in the general category of 3" deep

              Here is my conundrum.... I am installing power throughout the roof area and I need to run conduits. My overall depth is generally about 12 inches. I can not run my conduits in the insulation layer as it will cause condensation issues on the slab in the space below (which is already at a VERY high humidity), the client understandably does not want roof penetrations all over the place for the multitudes of receptacles that I need to place everywhere. Would this application even be considered direct burial? There is no AHJ to go to and ask, I have to derive this through the NEC and tell them. I plan to install all schedule 80 PVC (but that can change). Any advice is greatly appreciated......
              schedule 80 pvc above the insulation. i'd consider short pieces of nonferrous
              unistrut glued down to the insulation with a mastic that won't attack the insulation.
              actually, what i'd do, is shoot 1 5/8" strut directly to the concrete, put everything in,
              and then use an appropriate spray urethane insulation over everything. the urethane
              will bond to all of it, and you won't have any leaks, exfiltration, etc. picking the correct
              product to spray can also get you LEED points, if that is an issue.

              pull wire and whatnot BEFORE anything else is put over the top. just a thought. and where
              you have to stub up to a bell box, use GRC instead of plastic, and clamp it to the strut
              with strut straps tightly.
              ~New signature under construction.~
              ~~~~Please excuse the mess.~~~~

              Comment


                #8
                Originally posted by GoldDigger View Post
                Air layer? How do you do that? And does it double for drainage?

                I would imagine that either in the reservoir layer would be least disruptive. Or else in the rock/growth medium and hope it does not get dug into later?
                I do not believe it will be dug into. I am not sure how the air layer works...

                Comment


                  #9
                  Originally posted by brantmacga View Post
                  Roof pyramids?

                  https://m.erico.com/category.html?ca...us&language=en


                  Sent from my iPhone using Tapatalk
                  I am not sure where I would install the roof pyramids, it is a landscaped area essentially and they want a "clean" look.... (not like anyone will really see it)

                  Comment


                    #10
                    Originally posted by hbiss View Post
                    I think this is supposed to look like a landscape, not a roof.

                    -Hal
                    Yes it is.

                    Comment


                      #11
                      Originally posted by edward View Post
                      I would guess all of your roof penetrations can be confined in one specific area of the roof then use roof pyramids as Brant has suggested and install it on the reservoir layer as GD suggested.
                      Yes, we have several penetrations in one location then the conduits run all over the roof to supply power, lighting, and communications.

                      Comment


                        #12
                        Originally posted by steve66 View Post
                        I'd say the burial depth requirements don't apply.

                        I think its safe to say nobody should be digging deep enough to get into the insulation or roof membrane, or anything under the top layer of growth material.

                        And its very unlikely there will be a backhoe or bulldozer or anything similar on top of the roof like you might normally have with buried conduits and cables.

                        I'd use conduit and not worry about the depth requirements in 300.
                        Thank you. Yes, no one will be up there with any heavy equipment.

                        Comment


                          #13
                          Originally posted by Fulthrotl View Post
                          schedule 80 pvc above the insulation. i'd consider short pieces of nonferrous
                          unistrut glued down to the insulation with a mastic that won't attack the insulation.
                          actually, what i'd do, is shoot 1 5/8" strut directly to the concrete, put everything in,
                          and then use an appropriate spray urethane insulation over everything. the urethane
                          will bond to all of it, and you won't have any leaks, exfiltration, etc. picking the correct
                          product to spray can also get you LEED points, if that is an issue.

                          pull wire and whatnot BEFORE anything else is put over the top. just a thought. and where
                          you have to stub up to a bell box, use GRC instead of plastic, and clamp it to the strut
                          with strut straps tightly.
                          I will make these suggestions to the architect. I am not sure what they will say. As well, I am only the designer, so I can make suggestions, but ultimately the Architect and the client will make the final determinations, I can only make recommendations.

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