About this chapter: Chapter 13 allows for existing buildings to be evaluated so as to show that alterations, while not meeting new construction requirements, will improve the current existing situation. Provisions are based on a numerical scoring system involving 19 various safety parameters and the degree of code compliance for each issue.
Where a portion of the building is changed to a new occupancy classification and that portion is separated from the remainder of the building with fire barrier or horizontal assemblies having a fire-resistance rating as required by Table 508.4 of the International Building Code or Section R302 of the International Residential Code for the separate occupancies, or with approved compliance alternatives, the portion changed shall be made to conform to the provisions of this section. Only the portion separated shall be required to be evaluated for compliance.
Where a portion of the building is changed to a new occupancy classification and that portion is not separated from the remainder of the building with fire barriers or horizontal assemblies having a fire-resistance rating as required by Table 508.4 of the International Building Code or Section R302 of the International Residential Code for the separate occupancies, or with approved compliance alternatives, the provisions of this section which apply to each occupancy shall apply to the entire building. Where there are conflicting provisions, those requirements which secure the greater public safety shall apply to the entire building or structure.
An existing building or portion thereof shall not be altered in such a manner that results in the building being less safe or sanitary than such building is currently.
Exception: Where the current level of safety or sanitation is proposed to be reduced, the portion altered shall conform to the requirements of the International Building Code.
The evaluation process specified herein shall be followed in its entirety to evaluate existing buildings in Groups A, B, E, F, M, R, S and U. For existing buildings in Group I-2, the evaluation process specified herein shall be followed and applied to each and every individual smoke compartment. Table 1301.7 shall be utilized for tabulating the results of the evaluation. References to other sections of this code or other codes indicate that compliance with those sections is required in order to gain credit in the evaluation herein outlined. In applying this section to a building with mixed occupancies, where the separation between the mixed occupancies does not qualify for any category indicated in Section 1301.6.16, the score for each occupancy shall be determined, and the lower score determined for each section of the evaluation process shall apply to the entire building or to each smoke compartment for Group I-2 occupancies.
Where the separation between the mixed occupancies qualifies for any category indicated in Section 1301.6.16, the score for each occupancy shall apply to each portion or smoke compartment of the building based on the occupancy of the space.
The following formulas shall be used in computing the building height value.
EBH = Existing building height in feet (mm).
EBS = Existing building height in stories.
CF = 1 if (AH) — (EBH) is positive.
CF = Construction-type factor shown in Table 1301.6.6(2) if (AH) — (EBH) is negative.
Note: Where mixed occupancies are separated and individually evaluated as indicated in Section 1301.6, the values AH, AS, EBH and EBS shall be based on the height of the occupancy being evaluated.
The following formula shall be used in computing allowable area:
Aa = Allowable building area per story (square feet).
At = Tabular allowable area factor (NS, S1, S13R, or SM value, as applicable) in accordance with Table 506.2 of the International Building Code.
NS = Tabular allowable area factor in accordance with Table 506.2 of the International Building Code for a nonsprinklered building (regardless of whether the building is sprinklered).
The following formulas shall be used in computing the area value. Equation 13-4 shall be used for a single occupancy buildings and Equation 13-5 shall be used for multiple occupancy buildings. Determine the area value for each occupancy floor area on a floor-by-floor basis. For multiple occupancy, buildings with the minimum area value of the set of values obtained for the particular occupancy shall be used as the area value for that occupancy.
For single occupancy buildings:
i = Value for an individual separated occupancy on a floor.
n = Number of separated occupancies on a floor.
|A-4, B, E, S-2||0||5||10||15||20|
|F, M, R, S-1||0||4||10||16||22|
Evaluate the fire-resistance rating of floors and walls separating tenants, including dwelling units, and not evaluated under Sections 1301.6.3 and 1301.6.5. Group I-2 occupancies shall evaluate the rating of the separations between care recipient sleeping rooms.
Under the categories and occupancies in Table 1301.6.4, determine the appropriate value and enter that value in Table 1301.7 under Safety Parameter 1301.6.4, Tenant and Dwelling Unit Separation, for fire safety, means of egress and general safety. The value shall be zero for single tenant buildings and buildings without dwelling units.
|A-3, A-4, B, E, F, M, S-1||-4||-3||0||2||4|
The categories for tenant and dwelling unit separations are:
CORRIDOR WALL VALUES
|A-3, F, M, R, S-1||-7||-3||0||2|
|A-4, B, E, S-2||-5||-2||0||5|
The categories for corridor walls are:
VERTICAL OPENING PROTECTION VALUE
|None (unprotected opening)||-2 times number of floors connected|
|Less than 1 hour||-1 times number of floors connected|
|1 to less than 2 hours||1|
|2 hours or more||2|
|FACTOR||TYPE OF CONSTRUCTION|
The categories for HVAC systems are:
AUTOMATIC FIRE DETECTION VALUES
|A-1, A-3, F, M, R, S-1||-10||-5||0||2||6||NA|
|A-4, B, E, S-2||-4||-2||0||4||8||NA|
NA = Not Applicable.
NP = Not Permitted.
The categories for automatic fire detection are:
FIRE ALARM SYSTEM VALUES
|A-1, A-2, A-3, A-4, B, E, R||-10||-5||0||5|
|F, M, S||0||5||10||15|
The categories for fire alarm systems are:
SMOKE CONTROL VALUES
|A-1, A-2, A-3||0||1||2||3||6||6|
|B, M, R||0||2a||3a||3a||3a||4a|
The categories for smoke control are:
Evaluate the means of egress capacity and the number of exits available to the building occupants. In applying this section, the means of egress are required to conform to the following sections of the International Building Code: 1003.7, 1004, 1005, 1006, 1007, 1016.2, 1026.1, 1028.3, 1028.5, 1030.2, 1030.3, 1030.4 and 1031. The number of exits credited is the number that is available to each occupant of the area being evaluated. Existing fire escapes shall be accepted as a component in the means of egress when conforming to Section 504.
Under the categories and occupancies in Table 1301.6.11, determine the appropriate value and enter that value into Table 1301.7 under Safety Parameter 1301.6.11, Means of Egress Capacity, for means of egress and general safety.
MEANS OF EGRESS VALUES
|A-1, A-2, A-3, A-4, E, I-2||-10||0||2||8||10|
|B, F, S||-1||0||0||0||0|
The categories for means-of-egress capacity and number of exits are:
|A-1, A-3, A-4, B, F, M, R, S||-2||0||2||-4|
The categories for dead ends are:
Evaluate the length of exit access travel to an approved exit. Determine the appropriate points in accordance with the following equation and enter that value into Table 1301.7 under Safety Parameter 1301.6.13, Maximum Exit Access Travel Distance for means of egress and general safety. The maximum allowable exit access travel distance shall be determined in accordance with Section 1017.1 of the International Building Code.
ELEVATOR CONTROL VALUES
|Less than 25 feet of travel above or below the primary level of elevator access for emergency fire-fighting or rescue personnel||-2||0||0||+2|
|Travel of 25 feet or more above or below the primary level of elevator access for emergency fire-fighting or rescue personnel||-4||NP||0||+4|
For SI: 1 foot = 304.8 mm.
NP = Not Permitted.
The categories for elevator controls are:
The categories for means of egress emergency lighting are:
MIXED OCCUPANCY VALUESa
|A-1, A-2, R||-10||0||10|
|A-3, A-4, B, E, F, M, S||-5||0||5|
NP = Not Permitted.
The categories for mixed occupancies are:
SPRINKLER SYSTEM VALUES
|A-1, A-3, F, M, R, S-1||-6||-3||0||2||4||6|
|A-4, B, E, S-2||-12||-6||0||3||6||12|
NP = Not Permitted.
The categories for automatic sprinkler system protection are:
STANDPIPE SYSTEM VALUES
|A-1, A-3, F, M, R, S-1||-6||0||4||6|
|A-4, B, E, S-2||-12||0||6||12|
The categories for standpipe systems are:
INCIDENTAL USE AREA VALUES
|PROTECTION REQUIRED BY TABLE 509.1 OF THE INTERNATIONAL BUILDING CODE||PROTECTION PROVIDED|
|None||1 hour||AS||AS with CRS||1 hour and AS||2 hours||2 hours and AS|
|2 hours and AS||-4||-3||-2||-2||-1||-2||0|
|2 hours, or 1 hour and AS||-3||-2||-1||-1||0||0||0|
|1 hour and AS||-3||-2||-1||-1||0||-1||0|
|1 hour, or AS with CRS||-1||0||-1||-1||0||0||0|
|AS with CRS||-1||-1||-1||-1||0||-1||0|
|1 hour or AS||-1||0||0||0||0||0||0|
SMOKE COMPARTMENTATION VALUES
|A, B, E, F, M, R and S||0||0||0|
NP = Not Permitted.
Categories for smoke compartment size are:
CARE RECIPIENT ABILITY VALUES
The categories for care recipient ability for self-preservation are:
CARE RECIPIENT CONCENTRATION VALUES
The categories for care recipient concentration are:
ATTENDANT-TO-CARE RECIPIENTS RATIO VALUES
The categories for attendant-to-care recipient concentrations are:
SUMMARY SHEET—BUILDING CODE
|Existing occupancy:____________________________||Proposed occupancy:____________________________|
|Year building was constructed:____________________________||Number of stories: ___________ Height in feet:_______________|
|Type of construction: ___________________________________||Area per floor: _________________________________________|
|Percentage of open perimeter increase: ________ %|
|Completely suppressed:||Yes_______ No_____||Corridor wall rating:_____________________________________|
|Compartmentation:||Yes ______ No _______||Required door closers:||Yes__________ No___________|
|Fire-resistance rating of vertical opening enclosures:______________________________________________________________________|
|Type of HVAC system:___________________________________________, serving number of floors: ____________________________|
|Automatic fire detection:||Yes_______ No_______||Type and location: ______________________________________|
|Fire alarm system:||Yes_______ No_______||Type:_________________________________________________|
|Smoke control:||Yes_______ No_______||Type:_________________________________________________|
|Adequate exit routes:||Yes _______ No_______||Dead ends: ______________||Yes ________ No __________|
|Maximum exit access travel distance: ______________________||Elevator controls:||Yes ________ No __________|
|Means of egress emergency lighting:||Yes _______ No ______||Mixed occupancies:||Yes ________ No __________|
|Standpipes:||Yes_______ No_______||Care recipients ability for self-preservation: _________________________|
|Incidental use:||Yes_______ No_______||Care recipients concentration: ____________________________________|
|Smoke compartmentation less than 22,500 sq. feet (2092 m2):||Yes_______ No_______||Attendant-to-care recipients ratio: ________________________________|
|SAFETY PARAMETERS||FIRE SAFETY (FS)||MEANS OF EGRESS (ME)||GENERAL SAFETY (GS)|
|1301.6.1 Building height|
|1301.6.2 Building area|
|1301.6.4 Tenant and dwelling unit separations|
|1301.6.5 Corridor walls|
|1301.6.6 Vertical openings|
|1301.6.7 HVAC systems|
|1301.6.8 Automatic fire detection|
|1301.6.9 Fire alarm system|
|1301.6.10 Smoke control||* * * *|
|1301.6.11 Means of egress||* * * *|
|1301.6.12 Dead ends||* * * *|
|1301.6.13 Maximum exit access travel distance||* * * *|
|1301.6.14 Elevator control|
|1301.6.15 Means of egress emergency lighting||* * * *|
|1301.6.16 Mixed occupancies||* * * *|
|1301.6.17 Automatic sprinklers||÷ 2 =|
|1301.6.19 Incidental use|
|1301.6.20 Smoke compartmentation|
|1301.6.21.1Care recipients ability for self-preservationa||* * * *|
|1301.6.21.2Care recipients concentrationa||* * * *|
|1301.6.21.3 Attendant-to-care recipients ratioa||* * * *|
|Building score—total value|
* * * *No applicable value to be inserted.
MANDATORY SAFETY SCORESa
|OCCUPANCY||FIRE SAFETY(MFS)||MEANS OF EGRESS (MME)||GENERAL SAFETY (MGS)|
For mixed occupancies, the following provisions shall apply: