4 inches is the maximum width you can have in between the treads.

Stair Building Code

Maximum Rise

Minimum Stair Clearance

Painted Riser For Safety

Stair Guard Railing

Stair Tread Minimum

Grip Able Handrail

Gluing Stair Treads

Grip Able Handrail Building Code

Grip Able Handrail Height

Grip Able Stair Banisters

Layout to Cut Stair Risers

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