Technical · 5 min read
Granite for Outdoor Projects
Freeze-thaw, salt, pool chemistry and sun: how to specify granite that thrives outside.
Granite is one of the few premium surfaces genuinely at home outdoors — colorfast in sun, indifferent to rain and capable of decades under freeze-thaw cycling. But outdoor success is a specification exercise.
Choose low-absorption stone
Freeze-thaw damage happens when water enters stone and expands as ice. Dense granites with low water absorption shrug this off; more open material can spall over years of cycling. For northern climates, ask your supplier to confirm the stone's water-absorption figure and freeze-thaw suitability rather than assuming all granite performs alike.
Specify finish for slip, not looks
Polished granite outdoors is a liability wherever water reaches it. Flamed, brushed and sandblasted finishes provide the traction pool decks, steps and walkways need — and their lighter, matte character suits exterior light anyway.
Gauge thickness to the duty
3 cm covers pedestrian paving on a proper base; vehicular areas call for 5 cm or more; stair treads and copings follow their own profiles. De-icing salts and pool chemistry argue for denser stones and, where used, sealers rated for exterior exposure.