Spas and Spa Covers
Every week I get a call from someone wanting to know if we can build a custom spa cover. The answer is yes with a qualification. Not every spa can be covered. Before you let work begin on that custom spa idea you should consider how you plan to cover it. After the spa is built it will often be too late.
If you are considering having one of these spas built, make sure the designer is including a cover into the process and that it does offer insulation. Just having a safety cover anchored over the spa is not going to keep heat in or debris out. To insulate the water when the spa has different heights around the edge such as a spillway, the spa cover should actually rest on the water. By coming in contact with the water the insulating cover will cut down evaporation and chemical consumption too.
Where is my spa cover? Ever have to ask yourself this question after a wind storm? I have had people tell me they have found their cover a quarter mile from their home. I do not know how they knew it was their cover. Maybe in some parts of the country people write things on their spa covers to help them recover them after a storm. I suppose you could write, If Found Please Call, on the bottom. Maybe, Hope This Spa Cover Did Not Land On Your Sister.
It does not need to move it very much, just enough to create enough of a gap for some of the air to get under the cover. The second reason rigid foam spa covers fly is they have a nice air space between them and the water surface they are supposed to be keeping warm. Once air starts to flood into this air space it creates pressure. The air rushing in can not push down on the water so it takes the only thing it can move, the spa cover. Once this action starts it is only a matter of what velocity is required before lift off occurs. The first movement of the flying spa cover is straight up.
If it takes two and a half covers worth of foam to make up one cubic yard that translates to 4 million cubic yards of waste added to our land fills every two years just in spa covers.
If there are 11 million Cubic yards of stone in the Great Pyramid at Giza, we are adding enough foam to build a duplicate of it to our landfills just from used spa covers every six years conservatively. There are four and a half million cubic yards of concrete in Hoover Dam. We could build a two lane highway of discarded foam filled spa covers from Seattle Washington to Miami Florida every two years.
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