GraniteandQuartz Overhangs

What can we do for you today? www.countersource.net To our valued customers: Concerning the safety of extended overhangs in granite countertops, below you will find the recommendations of the Marble Institute of America: “It is not recommended to project any unsupported stone past the base more than 6”, for stone of 3/4” or less.” 1 The common practice in the stone industry is up to 8” overhang. 2CM – 8” maximum overhang without support 3CM – 10” maximum overhang without support 4CM Laminated Edge - 8” maximum overhang without support “Stone thicker than 3/4” can have a greater unsupported span.” 1 The common practice in the stone industry is up to 10” overhang. “When using some of the more fragile stones, including Soundness Classification Groups C and D marbles, the use of an unsupported stone overhang of any dimension may not be feasible.” 2 [Marbles in these two classifications are the most colorful, with significant holes, voids, and a large proportion of faults.] “All anchorage components shall be of 300 Series stainless steel (refer to ASTM A666 or aluminum (refer to ASTM B221) with strength and durability properties meeting or exceeding those of 6036-T6. Anchor types and assemblies shall comply with ASTM C1242-02a. Reliance on adhesives alone for material attachment will not be permitted.” 3 the CounterSource, inc. offers its customers 1 1/2” wide flat stock, 1/4” thick L-shaped hardened flat steel supports at additional charges per piece. We also encourage the use of metal brackets, or wood corbels, which need to be provided and installed by our customers. Detail drawings attached show MIA’s recommendations. 1 (MIA, Dimension Stone Design Manual, Version 6, p. 297, 2003). 2 (MIA, Dimension Stone Design Manual, Version 6, p. 83, 2003). 3 (MIA, Dimension Stone Design Manual, Version 6, p. 83, 2003).

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Transcript of GraniteandQuartz Overhangs

What can we do for you today? www.countersource.net

To our valued customers: Concerning the safety of extended overhangs in granite countertops, below you will find the recommendations of the Marble Institute of America:

“It is not recommended to project any unsupported stone past the base more than 6”, for stone of 3/4” or less.”1 The common practice in the stone industry is up to 8” overhang. 2CM – 8” maximum overhang without support 3CM – 10” maximum overhang without support

4CM Laminated Edge - 8” maximum overhang without support “Stone thicker than 3/4” can have a greater unsupported span.” 1 The common practice in the stone industry is up to 10” overhang. “When using some of the more fragile stones, including Soundness Classification Groups C and D marbles, the use of an unsupported stone overhang of any dimension may not be feasible.”2 [Marbles in these two classifications are the most colorful, with significant holes, voids, and a large proportion of faults.]

“All anchorage components shall be of 300 Series stainless steel (refer to ASTM A666

or aluminum (refer to ASTM B221) with strength and durability properties meeting or exceeding those of 6036-T6. Anchor types and assemblies shall comply with ASTM C1242-02a. Reliance on adhesives alone for material attachment will not be permitted.”3

the CounterSource, inc. offers its customers 1 1/2” wide flat stock, 1/4” thick L-shaped hardened flat steel supports at additional charges per piece. We also encourage the use of metal brackets, or wood corbels, which need to be provided and installed by our customers. Detail drawings attached show MIA’s recommendations.

1 (MIA, Dimension Stone Design Manual, Version 6, p. 297, 2003). 2 (MIA, Dimension Stone Design Manual, Version 6, p. 83, 2003). 3 (MIA, Dimension Stone Design Manual, Version 6, p. 83, 2003).