Where countertop seams go — over supports, away from cutouts, out of sight

Seams go where the stone is strongest and least seen: over a cabinet partition for support, away from sink and cooktop cutouts (the narrow webs crack), and out of the sightline from the entry. Slab size (~120×55″) sets how many you need.

A top-down plan of an L-shaped kitchen countertop showing where a fabricator places a seam. The seam lands over a cabinet partition so the joint is fully supported, is kept away from the sink and cooktop cutouts because the narrow webs of stone beside a cutout crack under stress, and is positioned out of the main sightline from the room entry so it is least visible. Because a typical quartz or granite slab is only about 120 by 55 inches, a long L-shaped run cannot come from one piece, so at least one seam is usually unavoidable — the goal is to place it well, not to avoid it. — Source: Natural Stone Institute dimension-stone practice (seam placement & support)

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A top-down plan of an L-shaped kitchen countertop showing where a fabricator places a seam. The seam lands over a cabinet partition so the joint is fully supported, is kept away from the sink and cooktop cutouts because the narrow webs of stone beside a cutout crack under stress, and is positioned out of the main sightline from the room entry so it is least visible. Because a typical quartz or granite slab is only about 120 by 55 inches, a long L-shaped run cannot come from one piece, so at least one seam is usually unavoidable — the goal is to place it well, not to avoid it.

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