Hello
I am new to the forum. I have recently receive a second hand hot tub from my grand parents who can no longer get in and out of it. They also never used it during the winter. It is a Gulf Coast spa(out of business) Lx7000.
My goal is to have an efficient(or as efficient as possible) hot tub to use during the winter.
Existing Condition
For reasons unknown, the tub has 1/16 of and inch of some kind of spray insulation. (Virtually no insulation) Location- Northeast USA
After extensive research, I haven't found concrete answer. Many solutions don't provide detailed solutions which a risk/benfit solution. I am hoping to start a constructive conversation to help myself and others like me.
Spray Foam (Closed Cell) -
Pro - 5-6 R Value/Easy to install in problem areas(Corners)
Con -Very difficult to repair hot tub/Dangerous Chemicals (DC)/Can damage equipment jetholes, tubing, etc (DE)
Spray Foam (Open Cell)
Pro - 2-3 R Value. Easy to install in problem areas,
Con - Moderately difficult to repair hot tub (but easier than closed cell), Water permeable, (DC), (DE), Limited availability
Rockwool
Pro - Easy install, Water Resistant
Con- Lower R values than foam.
Fiberglass or Fiberglass in Bags
Pro - cheap
Con - short term solution, Any moisture will greatly effect fiberglass R value
Reflective Insulation
Pro- Good to use as supplementary insulation
Con - Can not be used as primary insulation
I often see people posting whether or not spray foaming hot tub is a good idea but they never post a detailed solution. It sounds like it's the only viable option. The only foam I ever see used is closed cell foam. Would open cell(easier to remove) with a thicker coat be better.(Cuz of lower r value.) And if it is where can I get it at a reasonable price.
The other comment I always see is, "you should have spent more money on nicer tub". As I mentioned, I got a free second hand tub from my grand parents who can no longer get in and out of it and don't use it in winter. I would like to use it during the winter.
Does any one have any additional info or recommendations for my situation. Any info is appreciated.