7.5 Building Construction
Types of Construction. For each construction type, design fire resistive ratings of structural members in accordance with the requirements of the International Building Code.
Panel and Curtain Walls. All panel and curtain walls shall meet the requirements for nonbearing walls in the type of construction involved and shall be securely anchored to the building so as to prevent failure of the anchors during fire.
Fire Stopping. Fire stopping shall be provided in all openings between exterior walls (including panel, curtain, and spandrel walls) and floor slabs, and openings in floors and shaft enclosures, to form an effective fire and smoke barrier between stories.
All fireproofing (cementitious or fiber) used shall be specified to meet the following requirements:
- Deflection: No cracking, spalling or delamination. Test method ASTM E 759.
- Impact on Bonding: No cracking, spalling or delamination. Test method ASTM E 760.
- Corrosion Resistance: No corrosion. Test method ASTM E 937.
- Air Erosion: Maximum weight loss of 0.27 g/m2 (0.025 grams per square foot) in 24 hours. Test method ASTM E 859.
- Burning Characteristics: Maximum flame spread rating of 10 for concealed fireproofing, 5 for exposed fireproofing, and smoke development rating of 0. Test method ASTM E 84.
Concealed Sprayed-on Fireproofing.
- Density: The greater of 240 kg/m3 (15 pounds per cubic foot) or the density required to attain the required fire resistance rating. Test method
ASTM E 605.
- Thickness: The greater of 10 mm (0.375 inches) or the thickness required for the fire resistive design. Test method ASTM E 605.
- Bond Strength: 1030 kPa (150 PSI). Test method ASTM E 736.
- Compressive Strength: 35 kPa (5.21 PSI). Test method ASTM E 761.
Exterior Exposed Fireproofing. Fireproofing shall not be exposed to the outside environment unless there are no viable options. However, if this must occur, precautions must be made to protect fireproofing from light, moisture, rain, sleet and snow, and damage from other sources.