Vertical seam, Caution – Metal Sales Vertical Seam Manual User Manual

Page 16

PVS-16

VERTICAL SEAM

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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

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 three inches. Please contact your insulation supplier for specific recommendations on type of insulation, vapor barriers, and

installation procedures.

Blanket Insulation

Vertical Seam Clip

Rigid Insulation 4

Maximum (Per UL Listing)

Metal Decking

Vertical Seam panel

Bearing Plate