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What kind of foundation does a timber frame pavilion need?

A proper foundation is essential for the long-term stability and safety of your timber frame pavilion. The right foundation type depends on your local climate, soil conditions, and structure size.

Common foundation options:

  • Concrete footings (piers) – the most common choice for freestanding pavilions; posts are anchored into concrete poured below the frost line, which prevents heaving in cold climates
  • Concrete slab – ideal if you want a flat, finished floor surface; posts are anchored with post base hardware set into the slab
  • Compacted gravel base with post bases – a cost-effective option for warmer climates with stable, well-draining soil
  • Existing patio or deck – pavilions can be anchored to an existing concrete patio or deck with appropriate structural hardware

Key considerations:

  • Always set footings below your local frost depth to prevent frost heave
  • Ensure posts are never in direct ground contact — use post base hardware to elevate timber above moisture
  • Consult your local building department for code-compliant footing specifications in your area
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