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CertainTeed Vinyl Siding Installation Guide
13
SECTION 3 — Vinyl Soffit and Ventilation
Features of Vinyl Soffit
Butt Leg / Locking Leg
Molded area at bottom of
panel that is snapped into lock
on adjacent panel for secure
connection.
Panel Thickness
An important element
of soffit quality. Thicker
panels are more
durable and are less
prone to sagging.
Panel Projection
Common to products with
multiple faces (i.e. Triple 3). It is
the dimension required for the
proper selection of receiving
channels (e.g., J-channels and
corner pieces).
Nailing Flange
Flat area along top of panel with
slots for nailing; slots allow for
expansion and contraction.
Lock
Molded area just under nailing
flange into which butt leg/locking leg
of adjacent panel is secured.
Exposure
The width of the exposed
face of each panel of soffit;
also referred to as reveal.
Profile
The contour or outline of a soffit panel as viewed from the side.
Texture
Visual and tactile characteristics of
the soffit panel; designed to recreate
the authentic look of natural wood
grain, stucco, smooth, etc.
Solid Soffit
Invisibly Vented Soffit
Fully Vented Soffit
Center Vented Soffit