Maryville

Helical piles in Maryville, Tennessee

Much of Tennessee sits on soluble rock. According to the U.S. Geological Survey, carbonate rocks underlie most of Middle Tennessee and large areas of East Tennessee, producing sinkholes and irregular bedrock surfaces. Clay-rich residual soils over that limestone can be soft in some spots and pinned on rock pinnacles in others, which leads to uneven settlement.

Frost is modest, and local jurisdictions set the value. Knoxville uses a 12-inch figure similar to Nashville's, and higher elevations may call for more, so confirm with Blount County or Maryville building staff. Because bedrock depth can change quickly, installers record torque and depth at every pile.

Typical East Tennessee uses include underpinning settled homes, crawl space support and deck footings. Piles bear in the soil above rock or on the rock surface, depending on the engineer's design.

Helical pile companies serving Maryville

The directory lists one company based in Maryville.

• American Foundation & Waterproofing: a Maryville foundation repair and waterproofing company serving East Tennessee, North Georgia and western North Carolina, with helical and push piers.

Costs and what to ask

HomeGuide's national data puts installed helical piers at roughly $2,000 to $4,000 each, with about $3,000 typical (HomeGuide). Tennessee projects vary with depth to rock, pier count and access. See our helical pier cost guide.

• Are borings needed given the karst, and does an engineer set locations?
• Will you record torque and depth for every pile?
• What shaft size and galvanizing are specified?
• Who pulls the permit, and what does the warranty cover?

See Tennessee helical pile installers for other Tennessee companies.