The iconic Sky Pool in London has finally arrived and the overnight sensation that this pool has become is nothing short of remarkable. One of the most highly anticipated new pool projects, this incredible and instantly iconic pool has been written about incessantly since it was first devised.

This unique see-through acrylic wall pool sits suspended between two towers of the Embassy Gardens in London, England. Recently we had the opportunity to chat with Paul Gardner Vice President of Engineering for Reynolds Polymer, the manufacturers behind this creative and captivating new swimming pool vessel.

Swimmers enjoy warm weather in London at the Sky Pool which is believed to be the world’s first transparent pool built between two skyscrapers
https://t.co/mtRX8qvt0a pic.twitter.com/2skTGK9Jp7

— BBC News (UK) (@BBCNews) June 1, 2021

In preparation for our meeting, we hopped on one of our favorite social media groups Ask The Masters and found out what questions the pool industry had about the Sky Pool. There were a lot of interesting questions, which was indicative of how fascinated pool builders are about this project.

Sky Pool Has Worldwide Notoriety

We asked Gardner what it was like working on such a high visibility project. “We’re engineers and weren’t thinking about the marketing benefits that early on. Now it’s fun to be on it and we see how exciting it is from that standpoint.” said Gardner.

Given that Reynolds Polymer is a manufacturer of acrylic panels, there are very few companies around the world that could take on a project of the size and magnitude of the Sky Pool. Still, we wanted to know how Reynolds got the nod for this particular project.

A Short List of Manufacturers

“Y’know when you do something crazy with acrylic, there is only a few of us that can do that and really only a few that are willing to do it from an engineering standpoint to come up with a good solution, so the field was pretty narrow to begin with.” said Gardner.

“The client came to us pretty quickly.” said Gardner, “We worked on it a long time just to make sure something like this was even feasible.” Reynolds Polymer would go on to secure the design contract as well as the engineering contract shortly after that.

Engineering Hurdles To Overcome

Ultimately, there are probably only a handful of companies around the world that can take on a project of this scope. “When it comes to being monolithically cast, we’re the only ones that do it like that. All of our competitors will laminate. So, they’ll take thinner sheets and glue them together. But in this case getting a monolithically cast part, enabling us to use some of our other methodologies such as signature bonds, that’s the only way you could have done it.” said Gardner.

This particular project had many engineering challenges Reynolds Polymer had to overcome. One of them was accounting for movement from the actual structure of the building. We asked Gardner what his team did from an engineering standpoint to account for settling and movement between the two buildings.

Sky Pool: Engineering of the Vessel

“The swimming pool itself is set up as really an isolated box. On both ends, the acrylic is sitting in a steel tub and that steel tub is then sitting on concrete columns and supported by bearings. The steel tub and the acrylic vessel are cinched together with 2 tension rods underneath which are the only visible structural elements that you can see other than the acrylic. That creates essentially an open top box that can float depending on the movement of the buildings.” said Gardner.

“It can also be adjusted for settling. If there was enough settling, you could get in there and adjust the height of the bearings with either some shims or whatever was necessary to get it back to level.” continued Gardner.

Determining the Thickness of the Acrylic

Determining the proper thickness for the vessel encompassed doing finite element analysis, a widely used method for numerically solving differential equations arising in engineering and mathematical modeling. “We had lots of different load cases that we were looking at,” said Gardner, “By running through that and looking at like 15 or 20 load cases, we settled on a thickness. The thickness is really driven by long term stress. How much stress the acrylic can see to enable it to last for decades.”

The acrylic itself is resting on two steel tubs on either end that is supported by cementitious grout between the acrylic and the steel shelves the entire U channel structure is sitting on.

“You don’t build this and test it and expect it to fail.” said Gardner. All of Reynolds engineering and structural analysis was confirmed by an independent third party who determined the engineering specifications were precise. The polymer system of the Sky Pool is expected to last for at least 50 years.

Some of the questions we got from the pool industry pertained to actual seismic activity that may cause the structure to shift. We also wanted to know about the usability of the Sky Pool under real world conditions.

“Fortunately, London is not a very seismically active area. If there is such a thing, the pool is set on a system of bearings. It’s fixed on one side, and it’s allowed to move on the other. If there was any differential movement whether that’s seismic or heavy winds, there is ability of that structure to move independent of the pool.” said Gardner.

In playing devil’s advocate, we asked Gardner what the design entailed to keep water from the pool from splashing down below and keep the pool from freezing.

“The walls are about 8 feet high. They would have to splash it over the edge, and there is no reason they couldn’t. You have to have the safety walls up there so that people aren’t doing anything too crazy and hanging over the edge once you’re that high up. Otherwise, people could splash and get things over the edge if they get too wild.” said Gardner.

The pool itself is heated year round so the potential for the vessel freezing is nil. “The water is heated year-round so that water is never going to get an opportunity to freeze to a solid block. Plus, it doesn’t get that cold in London consistently enough to where you could have that happen.” said Gardner in responding to whether a pool freeze could cause damage.

Concealing The Plumbing

The filtration system for the Sky Pool has the pump room on one end of the two towers of Embassy Gardens so the water circulates from one side to the other. With no visible plumbing in the photos we have seen have the Sky Pool, we asked Gardner exactly how they managed to conceal all the plumbing. “You’ll notice a pedestrian bridge just north of the pool itself and there is some pipe work that runs through that pedestrian bridge that takes the water back over to the other side.”

Maintaining The Sky Pool

Another big question that was on our minds as well as many other folks in the pool industry was, how do you clean and maintain a pool that high up? “Obviously the wet side is easy to get to in to clean.” said Gardner, “The dry side… we’re pushing the limits of what you can reach with a man lift on the ground. That’s the process right now. They’ve got a man lift that can go up 10 stories and somebody is cleaning it on the dry side on a regular basis.”

Transporting this massive 175,000-pound acrylic structure to the Embassy Gardens in London was no easy task. “The interesting thing is when we were finally finished with it and ready to get it out of here, in Colorado we were having a bunch of wildfires. Even with the best planning and routing, we had to re-route it because the fires had shut down the highways on the route we wanted to go.” said Gardner.

“We got stuck on the Texas border because Hurricane Laura was coming through Houston which was the port we were going out of. We sat on the Texas border for a day or two waiting for Laura to clear out to where the ports would open back up.” said Gardner.

We followed the progress on Reynolds Polymers social media pretty much the entire way and like many other folks in the pool industry, wondered what the permitting process and logistics process was like. As it turns out transporting the vessel was a massive undertaking that took years of planning and coordination. “Permitting takes you multiple months because we had to get all the escorts lined up. It’s not the first large project for us though. For a small town of Grand Junction, Colorado we move a lot of material out of here.” said Gardner.

It certainly isn’t the first large scale acrylic pool project Reynolds has been involved with. Other incredible projects they have undertaken over the years include world class pools and structures all over the globe.

Reynolds Polymer has made a name for themselves in the pool industry for manufacturing, designing, and engineering over the top see through acrylic pool vessels and aquariums. Their work is rapidly gaining traction with luxury homeowners as well who want their own version of the elaborate Sky Pool in their own backyard.

Due to the incredible amount of attention the Sky Pool has already received, we can imagine there will be high demand for this particular concept. “There has already been inquiries coming in for little Sky Pools” said Gardner. “I think because of the publicity of the Sky Pool, there will definitely be others that want something similar. It’s very attractive to have something that catches the eye and floating water is something that people can’t seem to get enough of.”

Listen to our entire interview with the manufacturers of the Sky Pool on the Pool Magazine Podcast

Watch a video of behind-the-scenes footage of the Sky Pool making its way from Reynolds Polymer’s factory in Colorado all the way to London in the UK.

Article Photos Courtesy of Reynolds Polymer