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HomeMy WebLinkAboutBuilding DecksRESIDENTIAL DECKS – BASED ON 2021 IRC WHEN TO CALL FOR: Footing/ Post Holes – Holes dug, clean and free from debris. Prior to concrete placement. Framing – If deck is close to the ground and framing verification will be difficult. Framing/ Final – Deck, stairs, guards, handrails, and landing all complete. Other Inspections – Separate elec- trical, plumbing, and mechanical in- spections are required if those sys- tems are included in your project. Questions? Call us! (319) 356-5120 INSPECTIONS:  Inspections are scheduled through Cus- tomer Self-Service Portal used to apply for the permit.  Please allow for 24 hours advanced notice.  The location of the deck on the lot will be subject to all zoning requirements. Deck Footing Detail Deck Ledger Detail Rev. 01/2024 Beam Sizing Table (southern pine) Beam Size Deck Joist Span Less than or Equal To: (feet) 6 8 10 12 14 16 18 Beam Spans (Feet-Inches) 1-2x6 4-7 4-0 3-7 3-3 3-0 2-10 2-8 1- 2x8 5-11 5-1 4-7 4-2 3-10 3-7 3-5 1-2x10 7-0 6-0 5-5 4-11 4-7 4-3 4-0 1-2x12 8-3 7-1 6-4 5-10 5-5 5-0 4-9 (2) 2x6 6-11 5-11 5-4 4-10 4-6 4-3 4-0 (2) 2x8 8-9 7-7 6-9 6-2 5-9 5-4 5-0 (2) 2x10 10-4 9-0 8-0 7-4 6-9 6-4 6-0 (2) 2x12 12-2 10-7 9-5 8-7 8-0 7-5 7-0 (3) 2x6 8-6 7-5 6-8 6-1 5-8 5-3 4-11 (3) 2x8 10-11 9-6 8-6 7-9 7-2 6-8 6-4 (3) 2x10 13-0 11-2 10-0 9-2 8-6 7-11 7-6 (3) 2x12 15-3 13-3 11-10 10-9 10-0 9-4 8-10 Beams may cantilever ¼ of the adjacent beam span Joist Spans Joist Size and Spacing Spacing (inches) Allowable Joist Span Max. Cantilever * Span (feet-inches) Span (feet-inches) 2 x 6 12” o.c. 9-11 1-3 16” o.c. 9-0 1-4 24” o.c. 7-7 1-6 2 x 8 12” o.c. 13-1 2-1 16” o.c. 11-10 2-3 24” o.c. 9-8 2-5 2 x 10 12” o.c. 16-2 3-4 16” o.c. 14-0 3-6 24” o.c. 11-5 2-10 2 x 12 12” o.c. 18-0 4-6 16” o.c. 16-6 4-2 24” o.c. 13-6 3-4 *Max. Cantilever ¼ joist span or table value, whichever is less Deck Post Height Deck Post Size Maximum Height (feet- in) 4x4 8’* 4x6 8’ 6x6 14’ *6’-9” for 3 -ply beam Decking Materials Spans Material Max Joist Spacing Perpendicular Diagonal 5/4 Decking 16” 12” Nominal 2” Decking 24” 16” Composite Decking Follow Manufacturers Specs