Cat-5: Approach to Specifications
SUMMARY OF CATEGORY-5 APPROACH TO SPECIFICATIONS (A WORK IN PROGRESS)
REFERENCING SITE RISKS AND MATERIALS/SYSTEMS PERFORMANCE
Estimated chances of a weather event’s recurrence within next 30 years per FWS
(“Flood Return” Nat’l Weather Service calculator @ https://www.weather.gov/epz/wxcalc_floodperiod)
25-year event = 70.6% chance of occurrence
50-year event = 45.5% chance etc.
100-year event = 26% chance etc.
500-year event = 5.8% chance etc.
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GNERAL SITE RISKS
As aggravating factors and in hybrid risks
Water courses
Geographic aerodynamics
Flammables: types and proximities
Special Hybridities: (wind/fire or wind/flood/etc)
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DELUGE RISKS
Aggravating factors
Special Hybridities: (wind/fire or wind/flood/etc) See Isopluvial Map
Low: NWS risk of 500 year storm recurrence w/ 100-year 24-hour Isopluvial < 12”
Medium: NWS risk of 100-year storm recurrence w/ 100-year 24-hour Isopluvial = 12-16”
High: NWS risk of 100-year storm recurrence w/ 100-year 24-hour Isopluvial = 16-18”
Very High: NWS risk of 100-year storm recurrence w/ 100-year 24-hour Isopluvial = 18”+
All self sealing fasteners in all exterior assemblies for weather, thermal and fire protection; use specialty EIFS anchors
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FLOOD RISKS
Aggravating factors
Risk Hybridity (wind/fire or wind/flood/etc)
(Coastal National Risk Index county values)
Low flood risk: NWS risk of 500 year flood recurrence within next 30 years& CNRI Flooding Index < 30
Mezzanine bottom raised to 30” minimum
Exterior walls open below mezzanine
Interior walls N/A
Roof N/A
Special Hybridities:
Rainfall HIGH
Flood N/A
Fire N/A
Drought LOW
Medium flood risk:
NWS risk of 100-year flood recurrence & CNRI Coastal Flooding Index > 50
Mezzanine top raised to 60” minimum
Exterior walls open below mezzanine
Interior walls N/A
Roof N/A
Special Hybridities:
Rainfall HIGH
Flood N/A
Fire MODERATE
Drought MODERATE
High flood risk:
NWS risk of 25-year flood recurrence & CNRI Coastal Flooding Index > 80
Mezzanine top raised to 60”+ minimum
Exterior walls open below mezzanine
Interior walls N/A
Roof N/A
Special Hybridities:
Rainfall HIGH
Flood N/A
Fire HIGH (can create loose topsoil & potential for movement)
Drought HIGH
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WINDSTORM RISK
Risk Hybridity (H = wind/fire or wind/flood/etc)
Special Hybridities:
Rainfall HIGH
Flood N/A
Fire HIGH
Drought N/A
Low windstorm risk:
Structure to Category 1-2 per context
Mezzanine wood nonrated
Exterior walls wood liner nonrated
Interior walls wood nonrated
Roof N/A
Medium windstorm risk:
Structure to Category 3-4 per context
Mezzanine wood nonrated/protected
Exterior walls wood liner nonrated; openings w/impact units (C )
Interior walls wood nonrated
Roof has tiedowns
High windstorm risk: Structure to Category 5
Mezzanine wood nonrated/protected
Exterior walls wood liner nonrated; openings reinforced w/impact units (D)
Interior walls wood nonrated
Roof has tiedowns
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FIRE RISK
[Recommendedparameters for either High or Low risk] with aggravating factors
Note:
“Sheathed” = nonflammable sheathing
“Sheathed” = protective materials incorporated to insulate element(s) from fire
“Protected” = similar to a tested assembly; may be installed wholly or partially, w/ bias to protect structure (not occupants)
“Tempered” = all glass tempered
Special Hybridities: (ALL CLASSES)
Rainfall MEDIUM (see Flood)
Flood HIGH (later regrowth after drought = + fuel)
Wind HIGH
Drought HIGH
Low Fire Risk:
Low probability/Low intensity
All exterior parts/finishes non-flammable/sheathed
No protected assemblies, sheathing @ all exteriors
All exterior decks non-flammable (aluminum)
Moderate Fire Risk:
Moderate probability/Low intensity
Parts of structure protected
Mezzanine trusses (wooden) sheathed/protected
Exterior wall liner (wooden) not sheathed/not protected; openings rated
Interior walls (wooden) not protected
Roof and exterior soffits sheathed/not protected
All exterior decks non-flammable (aluminum)
High Fire Risk:
High probability/High intensity
Most of structure protected
Mezzanine trusses (metal) sheathed/protected
Exterior walls liner (metal) protected; openings rated
Interior walls (metal) not protected
Roof and exterior soffits sheathed/not protected
All exterior decks non-flammable (aluminum)
Real time irrigated roof and walls
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THERMAL RISK
Special Hybridities (wind/fire or wind/flood/etc)
Insulate to prevent Moisture build up and keep dew point outside building (walls)
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DROUGHT RISK
Special Hybridities (wind/fire or wind/flood/etc)