Handling and Installation
The on-site personnel should be familiar with the application sections of the
Cast Stone Institute Specifications and the Project Specification pertaining
to delivery, storage, setting, patching, cleaning, pointing, caulking and sealing.
In case of a conflict between the two specifications, the Project Specification
may not include a particular issue, the Industry Standards should be followed.
The following checklist has been developed for Cast Stone installations.
- Prior to delivery, there should be a set
of the approved shop drawings and the approved color and texture
sample on file. All test reports specified should be submitted
Upon delivery, all Cast Stone should be
checked for chips, cracks, stains, or broken pieces. Any damage
should be noted on the delivery slips and communicated to the
manufacturer or the sales representative.
- Color and texture should be inspected in accordance to approved
color sample or mock-up panel set up at the job site. In general,
the color and texture of the Cast Stone delivered to the job
site should be approximately equal to the approved sample when
viewed in good typical daylight conditions at 10-foot distance.
- Storage of Cast Stone should be above the ground on non-staining
planks or pallets. The storage site should be away from heavy
construction traffic. Cast Stone stored for an extended period
of time should be kept on pallets or non-staining planking and
covered with non-staining tarpaulins. Allow for air circulation.
- Prior to setting, insure climatic conditions are within thermal
limitations of mortar. Mortar retarders and accelerators should
be used according to manufacturer's directions, but not with
patching material. Set stone in full mortar joints and fill all
dowel holes and anchor slots completely with mortar. Insure uniform
joint widths within specifications tolerances.
- Ensure that all specified flashing and damp proofing is installed.
Flashing pierced by stone anchors must be sealed either by metal
thimble, grommet or approved sealant.
- Concrete should never be poured against unprotected Cast Stone.
Where poured in place concrete is placed against Cast Stone
sills, separate with a bond breaker prior to pouring concrete.
- Stone anchors must meet specified standards and be non-corrosive.
Stone slots to receive anchors should be completely filled with
- Prior to setting, insure that the surfaces set in mortar are
drenched with water. This will secure a good bond and help to
prevent mortar shrinkage.
- Weep holes must be installed over windows, at relieving angles
and at the bottom of walls. No mortar drippings shall be allowed
in the wythe between back of stone and face of back-up structure.
- All head joints at coping and joints at column covers, soffits,
and in general, all stone sections with projecting profiles,
exposed top joints or rigid suspension connections to the supporting
structure should be sealant joints. After setting, prime the
ends of the stones, insert properly sized backup rod and gun
All trim items except parapet coping must align with control joints. Do no
bridge coping over expansion joints.
Cast Stone should be handled to minimize chipping. Care must be taken not to
bump the stone into anything. Handle stones with the wide portion of the
cross section in the vertical position to minimize breakage.
After setting, columns, pilasters, entry jambs, window sills and all stone with projecting profiles should be protected during the remaining construction.
During construction, cover open walls when rain in anticipated.
Chipped Cast Stone must be patched by skilled mechanics. A trial patch must be approved before general patching is to commence. See patching.
Planter coping, fountain coping, swimming pool, treads, risers, stone pieces
at grade, and pavers should be treated with a silane or silixane water repellant
after setting. This will minimize the likelihood of dirt and ground water
entering the surface of the stone; a frequent cause of staining, efflorescence and enhancement of crazing. Check that the water repellent does not affect
color or texture when dry.
- Load bearing units should be reinforced as necessary. They may not be designed to be handled in a different orientation than they will be installed in the structure. Lintels and large panels must be kept vertical.
- When cast stone bands are detailed with brick, it should be detailed so
that movement between the two materials is not restricted. This can be achieved
by placing a non-staining bond break material (flashing, building felt,
polyethylene, etc.) into the bed joints above and below, as well as the
band itself, be adequately anchored to the backup wythe. Ties should be
spaced no more than 18" o.c. vertically, 16" when joint reinforcement is
specified. Bed joints above and below the accent band may be raked back
three-eighths to one-half inch and filled with backer rod or breaker tape
Custom Cast Stone
734 East 169th Street • Westfield, Indiana 46074
Toll Free 888.776.9960 © Custom Cast