Wood Movement Seasonal Gap
Calculator

Inputs

Required gap (mm)
80

Results

Required gap (mm)
80
Gap per metre (mm)
20
Required gap (inches)
3.149606

Results

Required gap (mm)80
Gap per metre (mm)20
Required gap (inches)3.149606

formula-map diagram

Required gap (mm)
80
Gap per metre (mm)
20
Required gap (inches)
3.149606

Formula map

Formula

Gap = run width × movement coefficient ÷ 100 × humidity swing

= 80

Note

This result is a simplified model; verify against your shop's own tolerances and material data before cutting.

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