Metal Sales Image II Manual - Manual (Page 9)

PIM-9
IMAGE II
© Metal Sales Manufacturing Corporation/ Subject to change without notice/ Effective Date 9/11
800.406.7387 (Corporate Office) • www.metalsales.us.com
d
esign
/ i
nsTallaTion
C
onsideraTions
(
ConT
)
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 roofing; these problems are common to all
types of construction.
The underside of the metal roof on a typical Architectural building should be protected from condensation by installing
panels directly over a minimum 30 lb moisture barrier and uniform solid substrate. This reduces airspace and the potential of
condensation forming on the underside of the panels.
VENTILATION
Typical metal building (no attic)
Vent
Vent at wall
Vent at eave
Building with attic or retrofitted
Vent
Insulation
PANEL APPLICATIONS
The following chart highlights UL 580 Class 90 for clip installation on the selected applications (see Fastener Selection Guide
page PGI-12-14 for other fasteners available). For more information on UL Construction numbers, refer to UL Roofing Materials
and System Directories. Panel gauges and clip spacing should be determined by a professional engineer according to the
governing building code.
* Subject to project loading, closer fastener spacing may be required. Contact your local Metal Sales branch representative
for more information (see pages PGI-2-3). Fastener spacing is based on maximum uplift suction load of 32 psf.
BEARING PLATE
CALL YOUR METAL SALES BRANCH FOR
ASTM-E1592 UPLIFT VALUE
18" o.c.
OVER
5 /
8
" WOOD DECK
AND METAL DECK
Standard 26 GAUGE IMAGE II
NUMBER
REQUIRED
*TYPE OF FASTENER APPLICATION
INSTALLATION
REQUIREMENTS
FASTENER
SPACING
PANEL TYPE