GMC 1976 ZEO 6083 Maintenance Manual page 40

Figure 37-Cab Roof Insulation
Both front and rear end caps are fiberglass ; and
the lower side panels, below the belt line, are fiber-
glass. The side panels, above the belt line, are sheet
aluminum . The main roof panel is also sheet alumi-
num.
Before starting repair operations, look for hidden
damage by applying force around the damaged area,
looking for hairline cracks and other breakage . Early
repair of minor damage may prevent major reapir
later.
PRECAUTIONS
Creams are available to protect the skin from a
condition known as occupational, or contact dermiti-
tis. Improved resin formulas have almost eliminated
The roof and side panels are bonded directly to
the aluminum framing. Pop rivets are then used to
secure the panels where the roof and side panels are
joined . Rivets are also used at the belt line .
INSULATION
BODY 1- 23
The main body area, rear end cap, side panels,
and roof cap of the driver's compartment are coated
with 3/4" thick rigid urethane foam, (figure 37) .
Areas which must remain accessible for servicing
have not been coated with insulation . These areas
include electrical harnesses, structure flanges, in-
terior component mounting surfaces, and pre-
insulated areas.
CAUTION: Urethane foam is a flammable
material. Welding near insulation may re-
sult in damage to insulation and/or vehicle.
As previously discussed, polyurethane foam pan-
els insulate the floor area . The driver toe pan mat is
insulated with 1/4" of "ENSOLITE" . The lower
dash area is also insulated.
The insulation package applied to vehicle insures
temperature control and improves performance of
heating and air conditioning systems. Be careful not
to damage insulation when making repairs.
REPAIR OF FIBERGLASS COMPONENTS
skin irritation . Cream is available for persons who
may have a tendency toward skin irritation from the
resins or dust .
The application of these creams is recommended
whenever the resin materials are used . Generally the
cream is not required when the plastic (epoxy) solder
kit is being used .
1 . Remove resin mixture from hands as soon as
possible and always before mixture starts to gel. This
can be observed by the action of the material being