The URL can be used to link to this page

Home My WebLink AboutArchitect's Code Review Report 03.30.2016GA,I GARNER ASSOCIATES, INC. 4181 County Road 311 New Castle, Colorado 81647 970.876.2210 Office 970.876.2209 Fax 970.379.8345 Cell e-mail: garner_harry@msn.com March 30, 2016 John Parrington Tally Ho Construction 145 County Road 225 Rifle. Colorado 81650 Re: Code Review Report for Prefabricated Metal Building for MRI, 1058 County Road 100, Carbondale Mr. Parrington As you have requested, this report classifies the Occupancy Groups and Construction Type for the Prefabricated metal building as designed by Sentinel Building Systems proposed to be built at 1058 County Road 100 in Garfield County, Colorado The evaluation is based on the 2009 International Building Code (IBC) as adopted by Garfield County. Colorado. DESCRIPTION OF THE PROJECT As you described in our meeting January 14, 2016, the proposed building will be used for the repair and maintenance of commercial vehicles and storage of parts and equipment used in the maintenance process. Administrative office space and storage will also be provided within the building envelope No hazardous materials in excess of the maximum quantities listed in IBC Section 307 and Tables 307.1 (1) and 307.1 (2) will be used in the maintenance process or stored on site. The proposed structure to house these activities is a prefabricated metal building designed by Sentinel Building Systems in a design manual dated 4126/13. The structure is proposed to be a approximately 144 feet x 82 feet (11,808 square feet) and will house approximately 592 square feet of parts storage space, approximately 720 square feet of office space and approximately 11,088 square feet of vehicle maintenance. The office space will be provided on a second floor above the storage space. The first floor storage space will include two single fixture toilets, one meeting handicap requirements, and one administrative work space meeting handicap requirements. The heating in the vehicle maintenance area will be gas tired infrared heaters. The office spaces will be heated by a gas fired forced air system. The proposed structure will be constructed of prefabricated steel frames with ribbed steel wall panels over steel girts and steel roof panels over steel purlins. The office space will be constructed with light gage steel framing with gypsum board each side. The second floor floor system will be constructed of prefabricated steel frames with floor beams. The floor will be 4 inch thick concrete over corrugate metal decking. Roof insulation will be R-40 batts and wall insulation will be R-19 baits. OCCUPANCY GROUP The proposed building will house a primary occupancy and an accessory occupancy group: Vehicle Maintenance Group S-1 (Main Occupancy) Section 311.2 Office Group B (Accessory Occupancy) Section 304.1 Storage Group S-1 (Accessory Occupancy) Section 311.2 The Group S-1 occupancy classification (IBC Section 311.2) is based upon: • Your confirmation that the materials and processes used in the maintenance of commercial vehicles are all substantially noncombustible materials, primarily metal, with possibly some negligible amounts of plastic components. • Your confirmation that none of the materials stored or used in the maintenance process meet the definition of any of the Hazardous Groups in IBC Section 307 or the quantities of hazardous materials listed in Tables 307.1 (1) and 307.1(2). CONSTRUCTION TYPE The Construction Type is determined to be Type II -B based upon these criteria as calculated below: • The ratio of the actual floor areas of the proposed structure and the allowable areas of the Occupancy Groups. * The materials proposed to be used in the construction of the building. ACTUAL FLOOR AREA Occupancy Group S-1 (motor vehicle repair garage) Occupancy Group B (office) Occupancy Group S-1 (storage) 11,088 square feet 720 square feet 505 square feet ALLOWABLE FLOOR AREA FOR CONSTRUCTION TYPE II -B (IBC Table 503) Occupancy Group S-1 2 -stories 17,500 square feet/story Occupancy Group B 3 -stories 23,000 square feet/story RATIO OF SEPARATED OCCUPANCIES (IBC Section 508.4.2) 11593/17500 + 720/23000 = 0.6747 + 0.0313 = 0.706 (required to be less than 1) MAXIMUM ALLOWABLE BUILDING HEIGHT FOR CONSTRUCTION TYPE II -B (IBC Table 503) 55 feet ACTUAL BUILDING HEIGHT 22 feet at the eaves, 29 feet at the ridge OCCUPANCY SEPARATION FIRE BARRIER The area of the accessory occupancies is greater than 10% of the area of the main occupancy and, therefore, will be required to be separated from the main occupancy (IBC 508.2.1) REQUIRED SEPARATION OF OCCUPANCIES (IBC Table 508.4) Occupancy Group B to Occupancy Group 8-1, non-sprinklered No separation FIRE RESISTANCE REQUIREMENTS FOR BUILDING ELEMENTS TYPE II -B (IBC Table 601) Zero for all elements FIRE RESISTANCE RATING OF EXTERIOR WALLS BASED ON FIRE SEPARATION DISTANCE (Table 602) (Fire Separation distance is distance to interior lot line or center of street) Group B Group S-2 Group S-1 Less than 5 feet 1 -hour 1 -hour 2 -hour 5 feet to 10 feet 1 -hour 1 -hour 1 -hour 10 feet to 30 feet 0 0 0 Greater than 30 feet 0 0 0 The new building will have separation on all sides greater than 10' and will therefore all exterior walls may be non -rated construction. AUTOMATIC SPRINKLER SYSTEM (IBC Section 903) An automatic sprinkler system is required in the 3-1 Occupancy used for the repair of commercial trucks or buses exceeding 5000 square feet (IBC Section 903.2.9.1(4)). In addition, Garfield County has amended the 2009 IFC to require an automatic sprinkler system in any building of Type IIB construction over 9000 square feet.(Amended IFC section 903.2, Table A). Therefore, a fire wall will be built centered under one of the structural frames to create two separate buildings under the provisions of IBC 702.1; one 3936 square feet and the other 7872 square feet. IBC Table 706.4 requires the fire wall to be 3 -hour fire rated construction built to be structurally stable under fire conditions to allow collapse of construction on either side without collapse of the wall. The wall will be built tight to the underside of the main structural bent and continue around each side of the structural bent to the underside of the noncombustible roof sheathing and Class B roof covering (IBC 702.6, Exception 3). The fire wall shall terminate horizontally at the interior face of the noncombustible wall sheathing (IBC Section 706.5, Exception 2). There shall not be any wall openings within 4 feet to either side of the fire wall. The fire wall shall be built to the requirements of one of the 3 -hour fire wall types listed below. Openings in the fire wall shall be protected and limited to a maximum of 156 square feet (IBC 706.8). Any doors in the fire wall shall have a 3 -hour fire door assembly rating. There shall be no roof penetrations within 4 feet of either side of the fire wall. The fire wall shall extend to the outer edge of horizontal projections except the fire wall may terminate at the interior surface of the exterior wall where the roof overhang has no concealed spaces and the exterior wall behind and below the overhang for the depth of the overhang and extending 4 feet on either side of the fire wall is 1 -hour fire rated construction. Openings is such walls shall have a fire rating of not Tess than 3/4 —hour (IBC Section 706.5.2, Exception 1), In lieu of an automatic sprinkler system in the 7872 square foot portion of the building, a fire barrier shall be installed so that the S-1 Occupancy is separated into two fire areas 3936 square feet each (IBC Section 707.3.9). The fire barrier shall be a 3 -hour fire rated assembly (IBC Table 707.3.9) extending from exterior wall to exterior wall and from the foundation (slab) to the underside of the main structural bent and continue around each side of the structural bent to the underside of the noncombustible roof sheathing and Class B roof covering (IBC Section 707.5). The fire barrier shall be built to the requirements of one of the 3 -hour fire barrier types listed below. Openings in the fire wall shall be protected but not be limited in size or percentage of area of the fire barrier where openings have been tested in accordance with ASTM E 119 or UL 263 (IBC Section 707.6, Exception 3) Any doors in the fire wall shall have a 3 -hour fire door assembly rating. Penetrations through and joints in the fire wall and fire barrier shall be protected by a system tested and have an F -rating of not Tess than 3 -hours. DESIGNS FOR 3 -HOUR FIRE WALL AND FIRE BARRIER The National Gypsum Association Fire Resistance Design Manual has several proprietary 3 - hour fire rated wall assemblies that meet the requirements for the fire wall and fire barrier. In a proprietary design all proprietary materials must be used as specified without substitution with the exception of steel studdepth and gage. General Explanatory Note 15 allows greater stud size (depth) and/or heavier gage of steel to be substituted for the steel stud specified in the design. The stud spacing indicated is the maximum allowed: GA File #WP 2800 GA File #WP 2921 GA File #WP 2922 GA File #WP 2930 See attached Gypsum Board Partition Descriptions. Penetrations in the fire barrier shall be protected by an approved penetration firestop system complying with IBC Section 713.3.1.2 Horizontal joints at the underside of the roof deck and vertical joints at the connection between the fire barrier and exterior wall panels shall be protected by an approved fire-resistant joint system designed to resist the passage of fire for a time period equal to the fire resistance rating of the wall. (IBC Section 714 SPECIAL REQUIREMENTS FOR MOTOR -VEHICLE -RELATED OCCUPANCIES Special detailed requirements must be provided in the Repair Garage in accordance with IBC Section 406.6 and the International Fire Code regarding construction, flooring, ventilation, heating equipment and gas detection system. EXITING OCCUPANT LOADS (IBS Table 1004.1.1) Office Storage Wash Bay Delivery Motor Vehicle Repair Garage( Bay 1) Motor Vehicle Repair Garage( Bay 2) Total Occupant Load EXITS REQUIRED (IBC Table 1015.1 and Table 1021.2) Office Storage Wash Bay Delivery Motor Vehicle Repair Garage (Bay 1) Motor Vehicle Repair Garage (Bay 2) 1 occupant/100 sf 1 occupant/300 sf 1 occupant/100 sf 1 occupant/300 sf 1 occupant/100 sf 1 occupant/100 sf 1 1 1 1 2 2 X 720 sf = 8 occupants X 505 sf = 2 occupants X 840 sf = 9 occupants X 2061 sf = 7 occupants X 3799 sf = 38 occupants X 3785 sf = 38 occupants 102 occupants EXIT REQUIREMENTS Travel Distance 75 feet maximum (IBC Section 1014.3) Width 32 inches clear opening minimum (IBC Section 1008.1.1) If you have any questions regarding this report please do not hesitate to contact me. Re pectfully, - i- (A-4-1 -6-itt,„_____ Harry Garner, Registered Architect President OrtreZhli all F HARRY A. 3q 7a rr 1