Natural Stone Sampling Best Practices

NATURAL STONE SAMPLING BEST PRACTICES

1.1.1. Project samples should be 1’0” x 1’0” in size or larger. Care must be taken to select
samples that accurately reflect the shades, markings, and anticipated ranges of
color, texture, finish, veining, filling, and other characteristics of the variety of stones
specified.

1.1.2. Range Samples. For very large projects, multiple samples are needed in order to
show the range of variations. These samples are not to be cut from the same slab
or block. Samples are normally assembled by selecting from the blocks that best
meet the requirements at that point in time. Sometimes visits to the quarries
become a necessary step in the selection process. Selecting slabs to be cut for
control samples of range of stone and finishes the project is necessary to see the
overall variation of the stone and finish to be used. In all cases, availability of the
material should be secured. These samples are normally 1’0” x 1’0” in size or larger.

1.1.3. All samples should reveal and show mesh backing and application
of resin, should this be required in production.

1.1.4. Number of Samples. The number of sample submissions required on a specific
project depends primarily on the amount and particular use of the stone required
and the stone itself. As many as ten samples may be required to show the variation,
markings, veins and other issues due to a particular stone’s inherent physical
characteristics. However, there should never be fewer than two sets of samples
submitted.

1.1.5. Control samples should be kept by the Architect, Contractor, and Producer for
verification of the selection approved. Stocking distributors should require current
samples to show any changes in the quarry or selection, grading, or quality issues.
These samples with photos should be documented to allow for any future debate that
might occur.