Inherent Material Weaknesses
Granite is porous, very porous. Capillary action will suck any moisture that
contacts the surface deep into the stone. Porosity also tends to increase over
time. Scientists have discovered bacteria in granite miles below the surface of
the earth living inside these pores and crevices.
Scientists have found thousands of new species of bacteria living in granite in
quantities as much as 100,000 bacteria per gram of stone.
Biology labs report that granite's porosity is so great that it distorts bacterial
testing unless the sides and bottom of samples are sealed.
No granite could be certified by the National Sanitation Foundation, nor is any
granite approved by the FDA due to this porosity among other things.
Granite has tremendous stress from being quarried. Millions of tons of pressure
have been taken off the granite when it is cut from the ground and sawn into
slabs. As the material ages, this stress causes a lot of problems such as
warpage across the slabs.
Granite typically has visible seams due to this warpage, seams that the MIA
industry standards say can be up to 1/16th of an inch wide, with another 1/16 of
an inch bevel on each side, making an average seam up to 3/16 of an inch
across, with up to 3/32 of an inch "lippage" (one side higher or lower).That is
over a 1/16th of an inch. When you add in tolerance levels, seams can be 1/4"
wide and still meet industry standards. Seams this crude are unsanitary,
trapping bacteria and mold, and seams can pop apart easily if the home or
Sinks must be drop in or undermount, integral mount sinks are impossible.
Under mount sinks are prone to sagging and even falling out, and it can be
difficult to place enough sink clips around the faucet area and the front of the
Hanging undermounts is a problem with granite. Undermount sinks are called
"crud catchers" in the trade, with large crevices that must be caulked regularly
to avoid leakage. A perfect place for bacteria to breed and difficult to clean
properly. Drop in sinks are unsanitary, have caulk to maintain, and make
cleaning more difficult.
Movement, which is veining or color variations in the slab, can make matching
the granite difficult in the seam area.
Granite requires special diamond tooling, making edge work expensive.
Laminations are difficult to match well. Sink cutouts are expensive, hundreds of
dollars and sometimes the reveal is uneven. Granite slabs are a product of
nature, with grain, movement and color variations in the slab, limiting the use of
scrap sections of the slab, making waste a major factor in the cost of your
countertop. Often, extra slabs must be purchased or quality reduced to keep
the price reasonable.
Edging and cutouts can add fifteen hundred dollars to the cost of a countertop.
UV damage on resined granite slabs