Most List discussions on this matter seem lead to Dynamat Xtreme as the
preferred insulation material.
In looking at the Dynamat web site, I find that this product is made with
black butyl based core, .067 (1/16 ?) inches thick, self adhesive, and comes
in 18" X 32" sheets - $40 for one sheet and $270 for nine sheets.
The following are possible substitutes that appear to be a similar product:
J.C.Whitney has the following:
a.. Protect your vehicle against radiant heat using the same technology
developed by NASA to protect its spacecraft!
b.. Reflects 97% of unwanted radiant heat
c.. Absorbs noise and protects against air currents and moisture
Durable, long lasting and easy to handle! Radiant heat can make travel
miserable. Insulate your floor, doors, side panels, engine compartment and
headliner to block heat. Lightweight aluminum foil faced blanket type
insulation is made of natural fibers-no fiberglass to irritate skin. 3/8"
thick underpadding is treated to protect against mold, mildew, fungus, etc.
Comfortable underfoot-won't bunch up or bottom out. Can be trimmed easily with
scissors to any size or shape. Fire retardant-carries Class A fire rating and
conforms to FMVSS 302. Contact Adhesive (item # ZX268587) and Aluminum Tape
(item #s ZX268588 and ZX268589) sold separately.
4' X 6', $29.99, 4' X 24', $84.99, and 4' X 48', $159.99
(3/8 inch may be too thick for some Healey applications.)
And - based upon some scraps I had left over after insulating my tunnel, I
found that a product is also available at places like Home Depot and can be
found as a wrap for heating/ac ducting. I have lost my notes but as I recall
it is a self adhesive, foil backed black foam, 1/6" thick, and I think comes
24" wide. I do not recall the length or cost but I am sure is far less
expensive than that name brand. I put two layers inside the tunnel and
secured it further with fender washers and bolts as suggested by someone on
The List not too long ago.
Back in the '70s, when I was new to the Healey world, I glued a bunch of Pink
Panther house insulation in there. I am convinced to this day that that was
the most effective head blocker of all the other products that I have used.
(The Other) Len
Vacaville, California, USA
1967 3000 MKIII, HBJ8L39031
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