3:28:16 PM.
Address: /showpage.php~file=06071000.htm.html
Title: Section 710  •  Size: 8225

Go to Table of Contents
Go to previous section: 709
Go to next section: 711


SECTION 710 - FLOOR-CEILINGS OR ROOF-CEILINGS

710.1 General. Fire-resistive floors, floor-ceiling or roof-ceiling assemblies shall be assumed to have the fire-resistance ratings set forth in Table 7-C. When materials are incorporated into an otherwise fire-resistive assembly which may change the capacity for heat dissipation, fire test results or other substantiating data shall be made available to the building official to show that the required fire-resistive time period is not reduced.

710.2 Ceiling Membrane Protection. When a ceiling forms the protective membrane for a fire-resistive floor-ceiling or roof-ceiling assembly, the ceiling shall be without openings in order to protect structural elements.

EXCEPTIONS: 1. Openings for noncombustible sprinkler pipe and openings for steel electrical outlet boxes not greater than 16 square inches (10 320 mm²) in area may be installed, provided the aggregate area of such openings through the ceiling is not more than 100 square inches (64 500 mm²) for any 100 square feet (9.3 m²) of ceiling area.

2. Duct openings protected with approved ceiling fire dampers.

3. In other than corridors that are required to have fire-resistive ceilings, duct openings may be unprotected when tests, conducted in accordance with U.B.C. Standard 7-1, have shown that opening protection is not required to maintain the fire resistance of the assembly.

4. Other ceiling openings and penetrations may be installed where such openings and penetrations and the assemblies in which they are utilized are tested in accordance with the provisions of U.B.C. Standard 7-1.

5. Openings enclosed in fire-resistance-rated shaft enclosures.

6. Access doors may be installed in such ceilings when they are approved horizontal access door assemblies listed for such purpose.

Where the weight of lay-in ceiling panels used as part of fire-resistive floor-ceiling or roof-ceiling assemblies is not adequate to resist an upward force of 1 pound per square foot (47.9 Pa), wire holddowns or other approved devices shall be installed above the panels to prevent vertical displacement under such upward force.

710.3 Floors. Fire-resistive floors and floors which are part of a floor-ceiling assembly shall be continuous without openings or penetrations in order to completely separate one story or basement from another.

EXCEPTIONS: 1. Openings enclosed in fire-resistive-rated shaft enclosures in accordance with Section 711.1.

2. Exit enclosures in accordance with Chapter 10.

3. Openings permitted in accordance with Section 711.3.

4. Atria constructed in accordance with Section 402.

5. Penetrations protected with through-penetration fire stops installed to provide an F rating or a T rating in accordance with Section 702. The T rating shall apply only to:

5.1 Penetrations which are not contained within a wall at the point where they penetrate the floor, or

5.2 Penetrations which are larger than a 4-inch (100 mm) nominal pipe or 16 square inches (10 320 mm²) in overall cross-sectional area.

6. Penetrations not larger than a 4-inch (100 mm) nominal pipe or 16 square inches (10 320 m²>) in overall cross-sectional area containing noncombustible penetrating items, where the annular space between the penetrating items and the floor assembly being penetrated is filled with a material which will prevent the passage of flame and hot gases sufficient to ignite cotton waste when subjected to U.B.C. Standard 7-1 time-temperature fire conditions under a minimum positive pressure differential of 0.01-inch (0.25 mm) water column at the location of the penetration for the time period at least equal to the fire-resistance rating of the floor assembly.

7. Penetrations not larger than a 4-inch (100 mm) nominal copper or ferrous pipe and conduit or 16 square inches (10 320m²) of overall cross-sectional area containing copper or ferrous penetrating items, where the annular space between the penetrating items and the floor assembly being penetrated is filled with concrete, grout or mortar for the full thickness of the floor assembly (or the thickness necessary to provide the required fire-resistance rating of the assembly being penetrated) at the location of the penetration in concrete floor assemblies.

710.4 Roofs. Fire-resistive roofs may have unprotected openings. See Chapter 24 for skylight construction.

710.5 Wiring in Plenums. Wiring in plenums shall comply with the Mechanical Code.

710.6 Construction Joints. Construction joints in fire-resistive floors shall comply with the requirements of Section 706.

Go to Table of Contents
Go to previous section: 709
Go to next section: 711


Commercial Asbuilts: BOMA Asbuilt | Definitions | Projects | Project Types | FAQ | Useful links
Residential Asbuilts: Projects | Asbuilt Services | FAQ
Contact | Copyright | Privacy Policy | Site Map | News