| 2012-12-28 18:07:12 | ***PROVISO*** |
| | ***REVISION REQUIRED SUBJECT TO FIELD INSPECTOR'S |
| | DISCRETION*** |
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| | UNDER FLOOR VENTILATION SHALL BE PROVIDED AS FOLLOWS: |
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| | R408.1 VENTILATION. |
| | THE UNDER-FLOOR SPACE BETWEEN THE BOTTOM OF THE FLOOR |
| | JOISTS AND THE EARTH UNDER ANY BUILDING (EXCEPT SPACE |
| | OCCUPIED BY A BASEMENT) SHALL HAVE VENTILATION OPENINGS |
| | THROUGH FOUNDATION WALLS OR EXTERIOR WALLS. THE MINIMUM |
| | NET AREA OF VENTILATION OPENINGS SHALL NOT BE LESS THAN |
| | 1 SQUARE FOOT (0.0929 M2) FOR EACH 150 SQUARE FEET (14 |
| | M2) OF UNDER-FLOOR SPACE AREA, UNLESS THE GROUND |
| | SURFACE IS COVERED BY A CLASS 1 VAPOR RETARDER |
| | MATERIAL. WHEN A CLASS 1 VAPOR RETARDER MATERIAL IS |
| | USED, THE MINIMUM NET AREA OF VENTILATION OPENINGS |
| | SHALL NOT BE LESS THAN 1 SQUARE FOOT (0.0929 M2) FOR |
| | EACH 1,500 SQUARE FEET (140 M2) OF UNDER-FLOOR SPACE |
| | AREA. ONE SUCH VENTILATING OPENING SHALL BE WITHIN 3 |
| | FEET (914 MM) OF EACH CORNER OF THE BUILDING. |
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| | EXCEPTION: CRAWL SPACES, DESIGNED BY A FLORIDA LICENSED |
| | ENGINEER OR REGISTERED ARCHITECT TO ELIMINATE THE |
| | VENTING. |
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| | R408.2 OPENINGS FOR UNDER-FLOOR VENTILATION. |
| | THE MINIMUM NET AREA OF VENTILATION OPENINGS SHALL NOT |
| | BE LESS THAN 1 SQUARE FOOT (0.0929 M2) FOR EACH 150 |
| | SQUARE FEET (14 M2) OF UNDER-FLOOR AREA. ONE |
| | VENTILATION OPENING SHALL BE WITHIN 3 FEET (915 MM) OF |
| | EACH CORNER OF THE BUILDING. VENTILATION OPENINGS SHALL |
| | BE COVERED FOR THEIR HEIGHT AND WIDTH WITH ANY OF THE |
| | FOLLOWING MATERIALS PROVIDED THAT THE LEAST DIMENSION |
| | OF THE COVERING SHALL NOT EXCEED 1/4 INCH (6.4 MM): |
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| | 1. PERFORATED SHEET METAL PLATES NOT LESS THAN 0.070 |
| | INCH (1.8 MM) THICK. |
| | 2. EXPANDED SHEET METAL PLATES NOT LESS THAN 0.047 INCH |
| | (1.2 MM) THICK. |
| | 3. CAST-IRON GRILL OR GRATING. |
| | 4. EXTRUDED LOAD-BEARING BRICK VENTS. |
| | 5. HARDWARE CLOTH OF 0.035 INCH (0.89 MM) WIRE OR |
| | HEAVIER. |
| | 6. CORROSION-RESISTANT WIRE MESH, WITH THE LEAST |
| | DIMENSION BEING 1/8 INCH (3.2 MM) THICK. |
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| | EXCEPTION: THE TOTAL AREA OF VENTILATION OPENINGS SHALL |
| | BE PERMITTED TO BE REDUCED TO 1/1,500 OF THE |
| | UNDER-FLOOR AREA WHERE THE GROUND SURFACE IS COVERED |
| | WITH AN APPROVED CLASS I VAPOR RETARDER MATERIAL AND |
| | THE REQUIRED OPENINGS ARE PLACED TO PROVIDE CROSS |
| | VENTILATION OF THE SPACE. THE INSTALLATION OF OPERABLE |
| | LOUVERS SHALL NOT BE PROHIBITED. |
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| | 2. ACCESS TO UNDER FLOOR SPACE |
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| | R408.4 ACCESS. |
| | ACCESS SHALL BE PROVIDED TO ALL UNDER-FLOOR SPACES. |
| | ACCESS OPENINGS THROUGH THE FLOOR SHALL BE A MINIMUM OF |
| | 18 INCHES BY 24 INCHES (457 MM BY 610 MM). OPENINGS |
| | THROUGH A PERIMETER WALL SHALL BE NOT LESS THAN 16 |
| | INCHES BY 24 INCHES (407 MM BY 610 MM). WHEN ANY |
| | PORTION OF THE THROUGH-WALL ACCESS IS BELOW GRADE, AN |
| | AREAWAY NOT LESS THAN 16 INCHES BY 24 INCHES (407 MM BY |
| | 610 MM) SHALL BE PROVIDED. THE BOTTOM OF THE AREAWAY |
| | SHALL BE BELOW THE THRESHOLD OF THE ACCESS OPENING. |
| | THROUGH WALL ACCESS OPENINGS SHALL NOT BE LOCATED UNDER |
| | A DOOR TO THE RESIDENCE. SEE SECTION M1305.1.4 FOR |
| | ACCESS REQUIREMENTS WHERE MECHANICAL EQUIPMENT IS |
| | LOCATED UNDER FLOORS |
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