1 DEVELOPMENT SERVICES BUILDING INSPECTIONS 505 WALNUT STREET, SUITE 1 MONTICELLO, MN City Hall (763) Building Inspections (763) Fax (763) RESIDENTIAL WOOD DECKS Important! This is a summary of Monticello s building and zoning regulations. For complete regulations, consult the Minnesota State Building Code and Monticello City Ordinances. Complete City Ordinances can be found on the city website, available online at PERMITS A building permit is required for construction of a deck that will be more than 30 inches above grade or attached to a dwelling. INSPECTIONS The following inspections must be requested: Site/Footing Inspection -- to approve deck location and size of footings prior to placement of concrete. Framing Prior to placement of deck boards Final -- Upon completion of deck. Please call to arrange an inspection. Have your permit number available when you call. SUBMITTALS REQUIRED FOR PERMIT Certificate of Survey with proposed deck drawn on it. Two (2) copies of construction plans showing proposed designs and materials. Drawings must be drawn to scale on paper and must include: Site Plan showing lot dimensions, and locations of existing and proposed structure(s) Floor Plan providing; deck and stair locations and dimensions lumber type size and spacing of footings, posts, beams, joists, headers, decking, guardrails and handrails Cross Sections and/or Elevations of rear or side views showing; height of deck from grade diameter and depth of footings guardrail height (if any) and spacing of intermediate rails rise and run of stairs (if any)
2 SETBACK AND DECK LOCATIONS Decks, patios and other related structures must be set back a minimum of 6 feet from side property lines and a minimum of 30 feet from front property lines and 10 feet from rear property lines. Decks must not be installed over property easements BUILDING CODE REQUIREMENTS FOOTINGS: All footings must extend at least 42 inches below grade. Frost footings are required for decks attached to dwellings or structures that have frost footings. Footings for decks must generally be 12 to 18 inches in diameter at their base. Deck footings must be designed to support a total load of 50 lbs per square foot of deck. Footings for three season and screen porches must generally be 16 to 24 inches in diameter at their base. If you intend to add a porch roof at a later date, you may want to design for those loads now (see attached chart for footing sizing). The three items that will affect your footing size are: joist and/or roof span, post/column spacing, and soil type. BUILDING CODE TABLE R PRESUMPTIVE LOAD BEARING VALUES OF FOUNDATION MATERIALS a LOAD-BEARING PRESSURE CLASS OF MATERIAL (pounds per square foot) Sandy gravel and/or gravel 3,000 Sand, silty sand, clayey sand, silty gravel and clayey gravel 2,000 Clay, sandy clay, silty clay, clayey silt, silt and sandy silt 1,500 a For SI: 1 pound per square foot = kpa. a. Where the building official determines that in-place soils with an allowable bearing capacity of less than 1,500 psf are likely to be present at the site, the allowable bearing capacity shall be determined by a soils investigation. **Please contact the building department if you are unsure of your soil type.** LUMBER & CONSTRUCTION: Lumber exposed to weather must be redwood, cedar, or treated (.40 or.60 AC2). Decks must be designed to support a total load of 50 pounds per square foot (see attached chart for lumber sizing). Wood decking must be at least 1 1/4 inches in thickness for floor joists spaced 24 inches on center, and 1 inch in thickness for floor joists spaced 16 inches on center. Note: If you are using composite decking be sure to check the manufacturer s specifications for joist spacing. Some brands may require joist to be 12 inches on center or less. Joists must not overhang beams (cantilever) by more than 12 inches for 2x6, 18 inches for 2x8, and 24 inches for 2x10's and larger. Beams must not overhang posts by more than 12 inches unless special design is approved. Longer overhangs/cantilevers may require an engineered design. Ledger boards or rim joists must be attached directly to solid wood framing members of the house. Siding should be removed. Connections between deck and dwelling shall be weatherproof/flashed and caulked. Header joists more than 6 feet long and tail joist over 12 feet long must be supported by approved framing anchors such as joist hangers. All hardware and fasteners must be corrosion resistant. GUARDRAILS: Guardrails must be installed around the deck and stair if the deck or stair is over 30 inches above grade. Guardrails must be at least 36 inches in height and must not permit the passage of a 4 inch sphere through the intermediate rails or pickets.
3 STAIRWAYS: Stairways must be at least 36 inches in width with a 7 3/4 inch maximum rise for risers and a 10 inch minimum run for treads. HANDRAILS: Graspable handrails must be provided on at least one side of stairways having 4 or more risers. Handrail height must be between 34 inches and 38 inches in height above the nosing of treads and extend continuously for the full length of the stairway. Handrails projecting from a wall must have a space of not less than 1 1/2 inch between the wall and the handrail. The handgrip portion of handrails must be not less than 1 1/4 inch no more than 2 inches in cross sectional dimension and must have a smooth surface with no sharp corners. Handrails must be returned at both ends. LANDINGS: Exterior stairs must be provided with a smooth level landing at the bottom of each flight. The landing must be as wide as the width of the stair and a minimum of three feet in the direction of travel. Examples of correct post-to-beam connections: *DO NOT HANG BEAM ON BOLTS: *Do not attach deck to a cantilevered area of the home without engineered specifications*