Precast Concrete Construction - Architectural Details
Facial projections can add a unique accent to your building project. Because
these features are cast to the panels “bottom in form,” a minimum
draft dimension is necessary in order to be able to strip the panels out
of the forms. Without proper draft, suction forces generated between the
concrete and the form may cause the panels to bind up during stripping and
possibly damage the panel and/or forms. To ensure this does not occur, Easi-Set
recommends a minimum draft of 1:6 on facial projections, as noted in the
sketch below. See Drawing Details on A-7 in the Typical
Details for more specific dimensional limitations. It should also be kept in mind
that facial projections tend to increase production costs, since forms need
to be built up to accommodate the feature.
