Fire suppression required by Section 4195 of the Michigan building code when constructed under the Michigan residential code for 1- and 2-family dwellings shall conform to Section P2904. Stairs risers must reach to a certain height usually 7-34 inches maximum and treads the horizontal part of the stair that you step on must be of a certain length 10 inches minimum.
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R5074 Decking Maximum allowable spacing for joists supporting decking shall be in accordance with Table R5074.
Michigan building code deck stairs. Raised floor surfaces more than 30 inches R3121 above grade below require guard rails not less than 36 inches in height. Construction can not deviate from the details herein unless prior approval is obtained from the authority having jurisdiction. 2 The minimum width of a temporary stairway shall be 22 inches 56 cm.
Plastic composite deck boards stair treads guards and handrails shall comply with the provisions of ASTM D 7032 and Section 5073 R50731 Labeling. ATTACHING STAIR TREADS TO a deck. Section R50722 requires that plastic composite exterior deck boards stair treads guards and handrails comply with the requirements of ASTM D7032.
Livework units complying with the requirements of Section 419 of the Michigan building code may be built as 1- and 2-family dwellings or townhouses. The Sections listed below are not the entire Code requirements for decks but are intended to help in the design of the proposed work. This image shows a contemporary technique where solid stringers and open risers are set higher up against the fascia and angle brackets secure them to the deck.
13032021 Section R311 also refers to IRC section R50722 which defines the requirements for outdoor plastic composite deck boards stair treads guards and handrails. Michigan Residential Code Requirements. 08062021 Deck stairs and their related items such as railings and balusters must be built according to local building code.
If the bottom or top step is noticeably different in height or length from the other stairs it will be a tripping hazard. Rule 21571 All wooden components that are necessary to construct and guard a temporary stairway shall be of construction-grade lumber. Treads must be at least 10 inches deep measuring from front to back.
The overall deck width at the house shall be equal to or greater than the distance the deck extends from the house. Inches high minimum 4 inches. Stairs with a total rise of over 30 shall have the bottom of the stringers rest on a 42 deep footing.
Plastic composite deck boards and stair treads or their packaging shall bear. This document applies to single level decks only. These dimensions tend to vary by jurisdiction.
The steps of the deck must be at least 36 inches wide. The step riser which is the vertical part of the stair that raises the step above the previous one can reach a maximum of 8. Plastic composite deck boards stair treads guards and handrails shall be installed in accordance with this code and the manufacturers instructions.
The maximum deviation from the biggest rise to the smallest can be no more than 38 of an inch. Stairs shall be attached to the deck structure with approved metal straps. The code has some very specific requirements for deck stairs.
19072021 Requirements for Deck Stairs. WOOD DECK CONSTRUCTION GUIDE Based on the 2015 Michigan Residential Code Revised May 17 2016 The details in this document apply to residential decks only. Stair rails on decks should be between 34 inches and 38 inches high measured vertically from the nose of the tread to the top of the rail.
In 2003 The State of Michigan amended these to 8. A decks stairway should be carefully planned so that all the stair rises the vertical height of the steps and all the tread depths the horizontal length of the step runs are equal. Those under 30 in total rise need to bear on solid soil or slab on grade.
There are two ways to attach stair stringers to your deck. All wood in contact with the ground shall be approved pressure treated wood suitable for ground contact. R5073 Plastic composite deck boards stair treads guards or handrails.
A stair with a single riser or with two risers and a tread is permitted at locations not required to be accessible by Chapter 11 where the risers and treads comply with Section 10115 the minimum depth of the tread is 13 inches 330 mm and not less than one handrail complying with Section 1014 is provided within 30 inches 762 mm of the centerline of the normal path of egress travel. 21032010 Maximum stair rise is 7 and minimum tread depth is 10 inches.
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