Metal Sales Clip-Loc Installation - Manual (Page 18)

© Metal Sales Manufacturing Corporation/ Subject to change without notice/ Effective Date 2/03
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17
CLIP-LOC
Proper design and installation of vapor barriers and ventilation systems are important to prevent condensation and the resulting
problems of moisture damage and loss of insulation efficiency.
Condensation occurs when moisture laden air comes in contact with a surface temperature equal to or below the dew point of
the air. This phenomenon creates problems that are not unique with metal buildings; these problems are common to all types of
construction.
The underside of the metal roof on a typical metal building (no attic) should be protected from condensation by insulating with a
faced insulation. This should reduce the potential of condensation forming on the underside of the panels.
On buildings that have an attic space or are being retrofitted with a metal roofing system, vents should be placed at both the eave
and peak of the roof in order to prevent a buildup of moisture (humidity) in the attic space.
VENTILATION
Typical metal building (no attic)
Vent
Vent at wall Vent at eave
Building with attic or retrofitted
Vent
Insulation
CAUTION
Use extreme care when working next to insulation. The insulation will provide a
false sense of security by hiding the view of the ground below the insulation.
Insulation is recommended on all applications to act as a sound barrier, prevent condensation, and increase insulating value of the
roof or ceiling system.
Typically, panels are installed over solid substrate but can be installed over open framing or metal decking (shown below) with
many different types of insulation. Blanket, rigid, and reflective insulation are just a few. Maximum thickness for blanket insula-
tion is four inches. Please contact your insulation supplier for specific recommendations on type of insulation, vapor barriers, and
installation procedures.
Clip-Loc Clip
Metal Decking
Clip-Loc panel
INSULATION
Blanket Insulation
Compressed to
3 /
8
" Maximum
Rigid Insulation
D
ESIGN
/ I
NSTALLATION
C
ONSIDERATIONS
(
CONT
.)