Close friend has just bought a used home with an indoor spa/hot tub. The cover is in decent shape except for the seam where it folds. Approximate dimensions are 7ft x 7ft.
Challenge is her dog wants to lie on top of it. Being 70 lbs+ the fear is the dog might rip through the seam ultimately falling into the spa.
Ideally a new dog safe cover would be wise. I'm guessing they are likely heavier than what she has now. Being mobility limited she needs something light weight yet durable.
I'm leaning towards a hardboard panel cut in half laid perpendicular over the spa cover. To resist sliding a couple Velcro patches should do. Slippery side down to avoid creating a traction problem.
Looking for comments, suggestions, or other improvements on this idea.
On Sunday, October 11, 2015 at 11:18:45 AM UTC-4, Chiefjim wrote:
If it's just the seam where it folds and an old failing cover, I'd just
get a piece of heavy compatible fabric and glue it in place along the
seam. Or she could secure the ends of the cover, they typically have
straps at either end that go over fasteners on the side of the spa.
If it can't move fore and aft, that plus maybe reinforcing the seam
should do it. You can buy replacement covers online for about $300.
AFAIK, they are about the same when new. New one will be lighter than the
old one because they fail be absorbing water and getting heavier. It also
reduces the insulation factor, but since it's inside, probably not a big
That would work too, but probably less attractive.
If the spa is still full (of water), consider putting some styrofoam
blocks under the cover. These are lightweight (so don't unduly
increase the weight of the cover) and will *float* on the water
in the spa. I.e., the *water* will support the cover (and the dog).
I guess I'd think in terms of, perhaps, one of those "cheap"
(inexpensive, disposable) styrofoam coolers -- the kind that
invariably *break* from misuse?
Imagine taking one of those and FILLING it with that "foam in
a can" stuff (used to seal around doors/windows).
You could probably do something similar with a large cardboard box
lined with a plastic bag (like from the dry cleaners). Then,
inject the "foam in a can" so the box provides the resulting
shape for the block while the plastic liner keeps the foam from
adhering to the box.
I *think* that foam would be as buoyant as styrofoam? No idea
how it would hold up, over time, to submersion in water...
(you'd also have to consider the impact any potential "disintegration"
would have on the spa and its filtration system)
On Sunday, October 11, 2015 at 9:43:43 PM UTC-5, Don Y wrote:
Using your suggestion I'm imagining using a vacuum style storage bag to hol
d the foam. The seals on those are generally pretty strong. End result wo
uld be foam pillows encased in plastic bags which would provide support for
the cover above. Curious whether those foam in a can products produce hea
t when first expanding? If so would the open end of the bag during filling
be enough to disperse it without damaging the storage bag?
On Monday, October 12, 2015 at 8:41:03 AM UTC-4, Chiefjim wrote:
old the foam. The seals on those are generally pretty strong. End result
would be foam pillows encased in plastic bags which would provide support f
or the cover above. Curious whether those foam in a can products produce h
eat when first expanding? If so would the open end of the bag during filli
ng be enough to disperse it without damaging the storage bag?
Maybe I misunderstood the problem. From the initial description it sounded
like the cover is sound, sturdy, not in danger of falling apart, but the
flex material that joins the two halves in the middle was the problem.
I can see that happening. The cover itself is like 5" thick and even the
old ones I've seen could easily support a dog. But if the joint in the
middle is falling apart, then the cover could separate, and the dog could
fall in. If that's the case, reinforcing the seam and securing the ends of
the cover so it can't slide solves the problem. But now seems you're on
to creating custom made floatation for the whole thing from underneath,
which doesn't sound very practical to me.
On Monday, October 12, 2015 at 9:46:07 AM UTC-5, trader_4 wrote:
Actually your perception is right on. That middle seam between the two folding halves is the primary concern. Cover is old and the dog rambunctious enough where nails going through the seam and ripping it open was feared.
Happy to report my initial plan of using two pieces of hardboard (Masonite) apparently maybe all that is needed. They spread the weight out to the sides resulting in no apparent flex at the seam.
The recommendations made for under the cover flotation support will be held in reserve should things change over time.
I think that would be heavier than necessary. But, if you've got them
Note that "pillow" is a misnomer. These won't be "soft" by any
stretch of the imagination! :>
Dunno. My first experience with the product (it comes in different
degrees of "expandability") was for window installation. Then,
learned that it shouldn't be used for such.
So, I salvaged the cans to insulate some outdoor Cu pipe that I
was running through cinderblock voids. Supports the pipe and
provides some thermal insulation (winter freezes).
As this was inside a block of concrete, any exothermic reaction
wasn't particularly evident.
One thing I learned, though, is you use the (spray) foam all at once.
Don't expect to cap the can and set it aside for another job next
Or, even 5 minutes from now!! The dispensing tube quickly clogs with
the foam rendering the can useless. So, its an all-or-nothing
Note that many folks with pools, here, have these "noodles" (extruded
cylinders/bars of urethane foam?) that float. Don't know if they are
intended as toys or floatation devices for kids?
But, if the water level is high enough in the spa, you could
cut those to the length/width of the spa opening and cover the
water surface with them -- effectively giving you a 6" thick
block of foam that you could remove in pieces (a large SOLID block
would be unwieldy)
Building materials and insullation department
of your hardware stores. Sold in half inch
sheet of 4 x 8 feet. Might not be water proof.
Christopher A. Young
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