Flat roof penetration for multiple linesets?

[bzinsky]

So I'm looking for something that I run 3-6 sets of AC linesets and corresponding electric through a torch down flat roof. Not sure how to go about that. They will immediately spread out once the are on the roof, so running a length of flexible conduit to house all of the lines isn't really what I'm looking for. I want to keep lineset lengths to a minimum since I'm close to the limit.

That being said, what's the best type of penetration I can use?

I was looking at gooseneck vents, something like this

I have never seen AC linesets and electrical just being ran out of them though, not sure if it's a good idea.

Most of the vents that are commonly used seem to be too small for what I need. Not looking to have a ton of penetrations for obvious reasons.

Any ideas?

Also, it's the Philadelphia region, the most snow I've ever seen on the ground is about 36" if that's relevant.

 

[bzinsky]

Maybe something like this
http://www.amazon.com/dp/B0002YU3MO/?tag=atomicindus08-20

And a 6inch pvc pipe coming through it, strap the pipe in the attic, go 2-3 feet high than a large radius 90 degree elbow?

 

[brewchief]

Look up best materials .com, I'd link if i knew how, lots of roofing materials and tons of options.

 

[BlackTalon]

A gooseneck like that is pretty close to what SMACNA and NRCA recommend. It's best to put in a real curb (treated wood is fine) and flash that with mod bit base flashing. then you fabricate/ install essentailly a sheet metal gooseneck that you route the service lines through. While I have seen a regular gooseneck like the one you show be used, it is better to fab it with a one-way-sloped top instead of an arched top, as you can loose-lock the sloped top all around so it is easily removable if/ when lines need to be changed down the road. Might want to contact a local commercial roofer that has a competant sheet metal shop; they should have some idea of how to fabricate such an enclosure.

Alternately, if you have sheet metal braking/ bending capabilities yourself shoot me a PM with your email address and I can scan/ email you the SMACNA/ NRCA detail so you can see how the pieces need to be formed and assembled.

 

[RivennHewn]

I just did couple for condensate units for some walk-in coolers.

I just built up a curb out of PT 2x12s. I made sure that they were high enough above the roof for snow/ice load.

The roofing goes up and over the edge, then the sheet metal cover will be built to hang down about 5". Can post pics next week.

 

[rlitman]

I've only seen it done one way. You put in a curb, extend your roofing up the sides (being careful to not cut square corners that will start a tear), flash up the sides and over the top, pass the lines through the open middle and fill around the lines with a pourable sealant. Look up a "pitch pocket".

 

[brewchief]

On a real computer now so here are a couple ideas, http://www.bestmaterials.com/detail.aspx?ID=10138 http://www.bestmaterials.com/detail.aspx?ID=16331 http://www.bestmaterials.com/detail.aspx?ID=18914

 

[sickjuice]

Pitch box. Build a box, extend the roof membrane up, run lines, stuff with insulation, and cap with metal (preferred) or more roof membrane

Never seen witch hats used on linesets. IMO I think the insulation would wick water

 

[BlackTalon]

Here's an example on a built-up roof: