Rooftop Infinity Edge Build

stiritup

Active member
Feb 12, 2021
40
Fairfax, MA
My family has begun the journey of constructing a house which will have a pool with two infinity edges on a rooftop. The pool will be on technically the 4th level of the structure and is 33 feet by 13.9 feet and 4.9 feet deep. It will have a beach access of 8.2 by .94 feet deep and 27 feet long. We are completely clueless in this area and hope to learn, and yes we are that naïve.

I am attaching the pool deck and plan and the current state of the building. The house itself is 3 levels including the basement. The top of the structure as shown is the roof which is a bar terrace. The pool deck comes after the current stage has been slabbed.
 

Attachments

  • Swimming Pool-Model.pdf
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  • IMG-20210121-WA0002 Current.jpg
    IMG-20210121-WA0002 Current.jpg
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  • IMG-20210316-WA0000 pool Plan.jpg
    IMG-20210316-WA0000 pool Plan.jpg
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bmoreswim

Mod Squad
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Jul 16, 2012
7,009
Central MD
Pool Size
27000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Hayward Aqua Rite (T-15)
Can't wait to watch this one proceed! Ask away with all your questions. Or just post and we'll ask questions!!
 

JamesW

TFP Expert
Mar 2, 2011
28,257
Those support columns look to thin to me.

I would want to be extra sure that everything was as strong as possible with a wide margin of safety.

For this project, you should have a geotechnical engineer to design the ground support and a structural engineer to design the rest.

A pool is extremely heavy and you don't want to take any chances of it cracking or collapsing.
 

JamesW

TFP Expert
Mar 2, 2011
28,257
The walls are specified at 200 mm, which is 7.874 inches. In my opinion that's likely not enough.

The support has to be super strong to hold the weight without shifting or sagging.

The concrete strength should be specified as well with a preference for high strength, high performance concrete.
 

bmoreswim

Mod Squad
Gold Supporter
Platinum Supporter
LifeTime Supporter
Jul 16, 2012
7,009
Central MD
Pool Size
27000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Hayward Aqua Rite (T-15)
Where is this pool located geographically? We need to change your location. Any seismic concerns to think about in the design?
 

JamesW

TFP Expert
Mar 2, 2011
28,257
It's hard to tell for sure, but I would say that the support columns should be at least twice as wide, which would create 4 times as much cross sectional area.

I would go back to the engineer and ask if they are sure that it's designed correctly.
 

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JamesW

TFP Expert
Mar 2, 2011
28,257
33 ft x 14 ft x 5 ft deep is about 17,300 gallons, which is 144,282 lbs or 72 tons just for the water.

The concrete will weigh about 114,600 lbs for a total weight of 258,882 lbs or 129 tons.

In my opinion, there's no way that the columns shown are strong enough to support that much weight.
 

JamesW

TFP Expert
Mar 2, 2011
28,257
The overall construction looks kind of sketchy, especially if there is supposed to be a pool sitting on the top.

Definitely need to get a qualified engineer to make sure that it's designed correctly.

Can you show a picture of the view from the house outward?
 

JamesW

TFP Expert
Mar 2, 2011
28,257
Maybe just put the pool in the yard if you're not 100% sure that the structure will support the pool.

With the slope, an infinity edge will probably still look good.

Let's see what the background looks like.
 

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