mylar as insulation

[mck75]

Awaiting new spa.  Preparing the area.  A friend recommends put a piece of mylar underneath to help insulate.  Does this seem like a good idea?

[Chad]

Welcome to the forum. What kind of spa did you buy?

I don't think it could hurt. Especially if it's being installed on an elevated platform where there will be cold air passing under the spa.

I would just stay clear of the foam backed kind as I think it would have a tendancy to absorb moisture and therefore creating bacteria/mold growths. Such as the one sold at the link below.
http://www.jcwhitney.com/autoparts/Product/tf-Browse/s-10101/Pr-p_Product.CATENTRY_ID:2002966/p-2002966/N-111+10208+600008469/c-10108

As always, consult with your dealer for warranty restrictions.

[mck75]

Thanks.  I appreciate all the valuable advice given in this forum.  I found some plain mylar for $12 a yard, so I figure it can't hurt and it might help.
After researching spas in this forum and the pool+spa forum and seeing what was available in our area we narrowed it down to a Sundance and a Marquis.  Since we have limited space, we were looking at the triangular tubs that hold about 150 gallons.  After trying them out, we found the Marquis Rendezvous was a good fit.  Also cost $1000 less!