(a) 
Pursuant to Title 31, Article 16, Part 2, C.R.S., there is hereby adopted by reference the International Existing Buildings Code, 2015 Edition published by the International Code Council, Inc., 4051 West Flossmoor Road, Country Club Hills, IL, 60478-5795 subject to such additions, deletions and amendments as are set forth in this article.
(b) 
One copy of such code is available for inspection in the office of the town building inspector during regular business hours.
(Ord. No. 19-12, § 1, 1-21-20)
Section 101.1, Title, Title, Scope and Purpose of the International Existing Buildings Code adopted in this article is hereby amended by the substitution of "Town of Mt. Crested Butte" for (NAME OF JURISDICTION) in the first sentence.
(Ord. No. 19-12, § 1, 1-21-20)
Section 202, General Definitions, of the International Existing Buildings Code adopted in this article is hereby amended to include the following definition:
"Egress Roof and Access Window."
A skylight or roof window designed and installed to satisfy the emergency escape and rescue opening requirements in Section R310.2
"Landing Platform"
A landing platform provided at the top step of a stairway accessing a loft.
"Loft."
Any floor level located above a main floor and open to it on at least one side complying with the area, access, and guard requirements of this section as adopted in this article, and used as a living or sleeping space
(Ord. No. 19-12, § 1, 1-21-20)
Section 812.1 Lofts in existing buildings of the International Existing Buildings Code adopted in this article is hereby amended by the addition of the following subsections:
Section 812.1 Scope.
The requirements of this section shall be limited to lofts in dwelling units in detached one- and two-family dwellings, townhouses, and Groups R-1, R-2, and R-3 occupancies that were originally constructed prior to the year 2020.
Section 812.2 Minimum Area and Dimensions.
Lofts shall have a floor area of not less than 35 square feet and shall not be less than 5 feet in any horizontal direction.
Section 812.2.1 Height Effect on Loft Area.
Portions of a loft with a sloped ceiling measuring less than 3 feet from the finished floor to the finished ceiling shall not be considered as contributing to the minimum required area of the loft.
Exception: Under gable roofs with a minimum slope of 6 units vertical to 12 units horizontal (50 percent slope), portions of a loft with a sloped ceiling measuring less than 16 inches from the finished floor to the finished ceiling shall not be considered as contributing to the minimum required area for the loft.
Section 812.3 Loft Access.
The access to and primary egress from lofts shall be of any type described in Sections 812.3.1 through 812.3.4.
Section 812.3.1 Stairways.
Stairways accessing lofts shall comply with the International Residential Code, as adopted, or with Sections 812.3.1.1 through 812.3.1.6.
Section 812.3.1.1 Width.
Stairways accessing a loft shall not be less than 17 inches in clear width at all points at or above the permitted handrail height. The minimum width below the handrail shall not be less than 20 inches.
Section 812.3.1.2 Headroom.
The headroom in stairways accessing a loft shall not be less than 6 feet 2 inches (1880 mm) measured vertically from the sloped line connecting the tread nosing's in the middle of the tread width.
Exception: The headroom for landing platforms shall not be less than 4 feet 6 inches.
Section 812.3.1.3 Treads and Risers.
Risers for stairs accessing a loft shall be a minimum of 7 inches and a maximum of 12 inches. Tread depth and riser height shall be calculated with the following formulas:
Tread depth = 20 inches (508 mm) minus 4/3 riser height
Riser height = 15 inches (381 mm) minus ¾ tread depth
Section 812.3.1.4 Land Platforms.
The top tread and riser of stairways accessing lofts shall be constructed as a landing platform where the loft ceiling height is less than 6 feet 2 inches where the stairway meets the loft. The landing platform shall be 18 inches to 22 inches in depth measured from the nosing of the landing platform to the edge of the lost, and 16 to 18 inches in height measured from the landing platform to the lost floor.
Section 812.3.1.5 Handrails.
Handrails shall comply with the 2015 International Residential Code Section R311.7.8.
Section 812.3.1.6 Stairway Guards.
Guards at open sides of stairways shall comply with the 2015 International Residential Code Section R312.1.
Section 812.3.2 Ladder Size, Capacity, and Incline.
Ladders accessing lofts are permitted. Ladders shall have 12 inches minimum rung width and 10 inches to 14 inch spacing between rungs. Ladders shall be capable of supporting a 200 pound load on any rung. Rung spacing shall be uniform within 3/8-inch. Ladders shall be installed at 70 to 80 degrees from horizontal.
Section 812.3.3 Alternating Tread Devices.
Alternating tread devices accessing lofts shall comply with the 2015 International Residential Code Sections R311.7.11.1 and R311.7.11.2. The clear width at and below the handrails shall be not less than 20 inches.
Section 812.3.4 Ships ladders.
Ships ladders accessing lofts shall comply with the 2015 International Residential Code Sections R311.7.12.1 and R311.7.12.2. The clear width at and below the handrails shall be not less than 20 inches.
Section 812.3.5 Loft Guards.
Loft guards shall be located along the open side(s) of lofts located more than 30 inches (762 mm) above the main floor. Loft guards shall be not less than 36 inches (914 mm) in height or one-half the clear height to the ceiling, whichever is less.
Section 812.4 Emergency Escape and Rescue Openings.
Lofts used as sleeping rooms shall meet the applicable requirements of the 2015 International Residential Code Section R310 and 2015 International Building Code Section 1030 for emergency escape and rescue openings.
Exception: Egress roof access windows in lofts used as sleeping rooms shall be deemed to meet the requirements of Sections R310 (IRC) and 1030 (IBC) where installed with the bottom of their opening no more than 44 inches (1118 mm) above the loft floor.
Section 909.1 Lofts in Existing Buildings of the International Existing Buildings Code adopted in this article is hereby amended by the addition of the following subsections:
Section 909.1 Scope.
The requirements of this section shall be limited to lofts in dwelling units in detached one- and two-family dwellings, townhouses, and Groups R-1, R-2, and R-3 occupancies that were originally constructed prior to the year 2020.
Section 909.1 Lofts.
Lofts as part of level 3 alterations shall comply with the provisions of Section 812 of the 2015 International Existing Building Code as adopted in this article.
(Ord. No. 19-12, § 1, 1-21-20)