Form-tie assemblies for
architectural concrete should permit tightening of forms and leave no metal
closer to the surface than I-1/2 inches (38 mm) for steel ties and 1 inch (25 mm)
for stainless tell ties. The ties should not be fitted with lugs, cones,
washers, or other devices that will leave depressions in the concrete less than
the diameter of the device, unless specified. Ties should be tight fitting or
tie holes in the form should be sealed to prevent leakage at the holes in the
form. If texture surfaces are to be formed, ties should be carefully evaluated
as to fit, pattern, grout leakage, and aesthetics.
Form ties and accompanying tie
holes are an almost inescapable part of wall surface. Architects frequently tie
holes into the visual design quality of the surface. If this is planned and any
effects or materials other than those provided in the upper heading are
desired, they should be clearly specified as to both location and type.
Where tie holes are to patched or
fitted, the architect should specify the treatment desired, unless it has been
shown on the pre-construction mock up.
