Mini-split unit on roof

Hi Joe @HomeAirInc, per ashton13’s recommendation I have been trying to get a quote or a site visit from you guys but you have been very slow to respond to my emails. Hope Sam comes down off that ladder soon to reply : )

Guest User | 6 years and 8 months ago

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krobertson

in General Discussion 6 years and 9 months ago

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I would like to place a mini-split unit on a flat roof. Planned to mount it on the parapet wall but an architect said since it was a small unit (~120 lbs), the DOB would be fine if its placed directly on the roof on top of a ‘concrete board’. The roof joists are wood. What is a concrete board and are there any drawback to placing it on the roof like this?

Guest User | 6 years and 9 months ago

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don’t know about the rules or how the installation would happen but be aware that you will lose access to the roofing material where the unit sits and could potentially void the roof warranty (if it’s still under warranty).

Guest User | 6 years and 9 months ago

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don’t know about the rules or how the installation would happen but be aware that you will lose access to the roofing material where the unit sits and could potentially void the roof warranty (if it’s still under warranty).

greenworks | 6 years and 9 months ago

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We’re getting quotes for mini splits now and we were told “no way no how” should we put the condensing unit directly on the roof — you can mount to parapet, suspend on a beam across, but not directly on.

It’s not just DOB who you’d be in trouble with too, its FDNY — so whatever the exact code is (our units will be over 120 lb so it wasn’t discussed) make sure you’ve got that part nailed. Don’t want to screw around when FDNY involved.

adam_dahill | 6 years and 9 months ago

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You can also put them in the backyard but it will be noisy at times. Booisgolden is right that they can hung on the parapet or chimney or on steel dunnage.

mozeeatupu | 6 years and 9 months ago

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> @adam_dahill
> You can also put them in the backyard but it will be noisy

The external units are almost dead silent now. You can’t hear them running when standing next to them.
But they have to be a certain distance from lot lines

nyc_sport | 6 years and 9 months ago

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I believe that any ac unit on the roof needs to be installed on dunnage (i.e., two I-beams running perpendicular to the roof beams). That is how mine were installed (although it is an apartment building; single family might be different)

krobertson

in General Discussion 6 years and 9 months ago

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Is the mounting method usually drawn/specified on filed DOB plans? My draft plan only shows the location and model #. I would hate to place it on the roof and then fail inspection because DOB says it needs to be on the parapet wall.

Key reason I’m considering the direct on roof option is it can be recessed 2-3 feet from the wall to be non-visible from the ground.

@booisgolden good point on FDNY, I’ll try giving them a call and ask.

Guest User | 6 years and 9 months ago

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I am also getting a mini split system and met with two roofers last week. One roofer said he would simply reinforce the joists below and put the condensers on top “no problem”. The other roofer said he wants nothing to do with the securing of the mini splits and that our HVAC contractor should take care of that. Does anyone have a photo of steel dunnage spanning between party walls that does not look too hideous? Thoughts?

krobertson

in General Discussion 6 years and 9 months ago

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I asked FDNY about the placing the split units directly on the roof and the inspector pretty much said as long as its approved by DOB its fine. But if the unit is over 3 HP, I’ll need to have a Equipment Use Permit. I think he probably meant 3 Tons, not HP — which comes out to 36,000 BTU.

jimhillra | 6 years and 9 months ago

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Either on or mounted to something non-combustible. The roof joists can be reinforced with steel, but the steel alone must be able to support the unit if the wood joists burn. This is all to prevent a big piece of machinery dropping through the roof on top of a firefighter during a fire, so think of it in those terms.

Guest User | 6 years and 9 months ago

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Has anyone gotten any good quotes on installing mini splits throughout a brownstone? A contractor previously quoted me 14K while an HVAC contractor quoted me 103K. I find it mind boggling to receive such wildly different numbers!

adam_dahill | 6 years and 9 months ago

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14k is insanely low. Maybe for one or two air handlers mounted on the rear wall. It depends on how many air handlers and compressors you need. Are you doing a ducted mini split hidden in ceilings etc?

Guest User | 6 years and 9 months ago

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We need 6 air handlers and 2 condensing units. I realize 14K is low – maybe the GC didn’t include the equipment. Yes we are doing ducted mini splits in the ceiling with floor grilles because we don’t like seeing the boxes on the walls. What is a more reasonable price including equipment?

EJR | 6 years and 9 months ago

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I have 2 condensers plus 4 air handlers (1×3 and 1×2). Each of those installs was about $14k all said and done, so I imagine something in the $25-30k range would be correct. The cost will be higher if you are doing anything substantial to the roof to support the units. One of my units is on a concrete pad in my backyard, the other is on the parapet on my roof.

greenworks | 6 years and 9 months ago

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There’s a few threads recent threads where people discuss cost in depth if you search for mini split, even within the last year. That’s where I got my ballpark numbers.

Guest User | 6 years and 9 months ago

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Thanks EJR and booisgolden. That range is to be expected and much more manageble. I had combed previous threads but I’ve noticed even in recent months contractor prices have risen. For instance, I contacted a roofer back in March how much it would cost to replace the roof and maybe some of the plywood – it was 12K back then. Just contacted the same guy again and his price jumped to 20K. It’s amazing how much everything in the construction industry increases in a short period of time, while the average typical salary doesn’t.

adam_dahill | 6 years and 9 months ago

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Make sure to come back to this thread when you complete the job to compare costs. There are a lot hidden costs with A/C installation. Steel Dunnage, Plaster work, skim coating, painting etc.. the costs vary depending on how “hidden” you want the units to be

greenworks | 6 years and 9 months ago

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Hey Jim Hill, steering this back to original topic if you’re still around –

so, when you say mounted to something noncombustible, does that mean as long as the beams roof joists are also reinforced with steel?

Once this topic popped up, I looked at a ton of photos of roof installs and found many with the condensing unit on the roof resting on mini beams (technical term) that were only a little bigger than the condensing unit.

When I see that type of install, does that mean the joists below were also reinforced or should have been? Otherwise, if there’s a fire, that type of mounting only insures that something heavier will fall on top of the firefighter, yes? Hope this makes sense.