Wind Damage >> Protecting Against Hurricanes

Attachment of Brick Veneer in High-Wind Regions Table 1. Brick Veneer Tie Spacing Wind Speed (mph)(3-Second Peak Gust) Maximum Vertical Spacing for Ties 16" stud spacing 24" stud Protecting Against Hurricanes spacing 90 18.0a 16.0a 100 18.0a 16.0a 110 18.0a 14.8 120 18.0a NAb 130 15.9 NAb 140 13.7 NAb 150 10.2 Nab 

Wind Pressure (psf) Maximum Vertical Spacing for Ties 16" stud spacing Protecting Against Hurricanes 24" stud spacing 17.8 18.0a 16.0 a 22.0 18.0a 16.0 a 26.6 18.0a 14.8 31.6 18.0a NA b 37.1 15.9 NA b 43.0 13.7 NA b 49.4 10.2 Na b Notes: 1. 

The tie spacing is based on wind loads derived from Method 1 of ASCE 7-02, for the corner area of buildings up to 30' high, located in Exposure B with an importance factor (I) of 1.0 and no topographic influence. For other heights, exposure, or Protecting Against Hurricanes importance factor, an engineered design is recommended. 2. 

Fastener strength is for wall framing with a Specific Gravity G=0.55 with moisture contents less than 19% and the following adjustment factors, Protecting Against Hurricanes Ct=0.8; and CD, CM, Ceg, and Ctn=1.0. 3. 

Nail embedment depth of 2" for 2.5" long 8d common (0.131" diameter) ring- shank fasteners a Maximum spacing allowed by ACI 530-05 b 24" stud spacing exceeds the maximum horizontal tie spacing of ACI 530-05 prescribed for wind speeds over 100 mph [End table] Attachment of Protecting Against Hurricanes Rooftop Equipment in High-Wind Regions

Hurricane Katrina Recovery AdvisoryMay 2006, Revised July 2006FEMA Purpose: To recommend practices for designing and Protecting Against Hurricanes installing rooftop equipment that will enhance wind resistance in high-wind regions. [Begin text box]

Note: For attachment of lightning protection systems, see Hurricane Katrina Recovery Advisory on Protecting Against Hurricanes Rooftop Attachment of Lightning Protection Systems in High-Wind Regions. [End text box] Key Issues Rooftop equipment frequently becomes detached from rooftops during hurricanes. 

Water can enter the building at displaced equipment (see Figure 1); displaced equipment can puncture and Protecting Against Hurricanes tear roof coverings (thus allowing water to leak into the building). Equipment blown from a roof can damage buildings and injure people. Damaged equipment may no longer provide service to the building. Figure 1 caption. 

This gooseneck was attached with only two small screws. A substantial amount of water was able to enter the building during the hurricane. [end of caption] Construction Guidance Mechanical Penthouse: Protecting Against Hurricanes By placing equipment in mechanical penthouses rather than being exposed on the roof, equipment within penthouses is shielded from high-wind loads and windborne debris. 

Therefore, use of mechanical penthouses designed and constructed in accordance with a current building code are recommended, Protecting Against Hurricanes particularly for critical and essential facilities.Design Loads and Safety Factors: Loads on rooftop equipment should be determined in accordance with the 2005 edition of ASCE 7. Figure 2 caption. 

This 30’ x 10’ x 8’ 18,000-pound HVAC unit was attached to its curb with 16 straps (one screw per strap). Although the wind speeds were Protecting Against Hurricanes estimated to be only 85 to 95 miles per hour (3-second peak gust), it blew off the building. [end of caption] 

Note: For guidance on load calculations, see "Calculating Wind Loads and Anchorage Requirements for Rooftop Equipment,” ASHRAE Journal, volume 48, number 3, March 2006. A minimum safety factor of 3 is recommended for critical and essential facilities, and Protecting Against Hurricanes a minimum safety factor of 2 is recommended for other buildings. 

Loads and resistance should also be calculated for heavy pieces of equipment (see Figure 2). Simplified Attachment Table: To anchor fans, small HVAC units, and relief air hoods, Protecting Against Hurricanes the following minimum attachment schedule is recommended (see Table 1) (note: the attachment of the curb to the roof deck also needs to be designed to resist the design loads):   

Number of #12 Screws for Base Case Attachment of Rooftop Equipment Case No.: 1 Curb Size and Equipment Type: 12”x 12” Curb with Protecting Against Hurricanes Gooseneck Relief Air Hood Equipment Attachment: Hood Screwed to Curb Fastener Factor for Each Side of Curb or Flange: 1.6 Case No.: 2Curb Size and Equipment Type: 12”x 12” 

Gooseneck Relief Air Hood with Flange Equipment Attachment: Flange Screwed to 22 Gauge Steel Roof Deck Fastener Factor for Each Side of Curb or Protecting Against Hurricanes Flange: 2.8 Case No.: 3Curb Size and Equipment Type: 12”x 12” Gooseneck Relief Air Hood with FlangeEquipment Attachment: Flange Screwed to 15/32” OSB Roof Deck 

Fastener Factor for Each Side of Curb or Flange: 2.9 Case No.: 4Curb Size and Equipment Type: 24”x 24” Curb with Gooseneck Relief Air HoodEquipment Attachment: Hood Screwed to Protecting Against Hurricanes Curb Fastener Factor for Each Side of Curb or Flange: 4.6 Case No.: 5Curb Size and Equipment Type: 24”x 24” Gooseneck Relief Air Hood with Flange

Equipment Attachment: Flange Screwed to 22 Gauge Steel Roof Deck Fastener Factor for Each Side of Curb or Protecting Against Hurricanes Flange: 8.1 Case No.: 6Curb Size and Equipment Type: 24”x 24” Gooseneck Relief Air Hood with Flange Equipment Attachment: Flange Screwed to 15/32” OSB Roof Deck Fastener Factor for Each Side of Curb or Flange: 8.2 Case No.: 7

Curb Size and Equipment Type: 24”x 24” Curb with Exhaust Fan Equipment Attachment: Fan Screwed to CurbFastener Factor for Each Side of Curb or Protecting Against Hurricanes Flange: 2.5 Case No.: 8Curb Size and Equipment Type: 36”x 36” Curb with Exhaust FanEquipment Attachment: Fan Screwed to Curb

Fastener Factor for Each Side of Curb or Flange: 3.3 Case No.: 9Curb Size and Equipment Type: 5’-9”x 3’- 8” Curb with 2’- 8” high HVAC UnitEquipment Attachment: HVAC Unit Screwed to CurbFastener Factor for Each Side of Curb or Protecting Against Hurricanes Flange:  

Case No.: 10Curb Size and Equipment Type: 5’-9”x 3’- 8” Curb with 2’- 8” high Relief Air HoodEquipment Attachment: Hood Screwed to CurbFastener Factor for Each Side Protecting Against Hurricanes of Curb or Flange: 35.6* Notes to Table: 1. The loads are based on the 2005 edition of ASCE 7. The resistance includes equipment weight. 

The Base Case of the tabulated numbers of #12 screws (or ¼ pan-head screws for flange-attachment) is a 90-mph basic wind speed, 1.15 importance factor, 30’ building height, Protecting Against Hurricanes Exposure C, using a safety factor of 3.

Asbestos Abatement

How are asbestos abatement-related diseases detected? Individuals who have been exposed (or suspect they have been exposed) to asbestos abatement fibers on the job, through the environment, or at home via a family contact should inform their doctor about their exposure history and whether or [M  read more..

How To Get Animals Out Of Your Roof

Compensation would give little incentive to livestock owners to limit losses through improved animal husbandry practices and other management strategies. Not all producers would rely completely on a Animal Damage How To Get Animals Out Of Your Roof compensation program and unregulated lethal control would most likely continue as permitted by s  read more..

Wet Carpet From Water Heater Leak

Many molds produce numerous protein or glycoprotein allergens capable of causing allergic reactions in people. These allergens have been measured in spores as well as in other fungal fragments. An estimated 6%-10% of the general population Water Damage Wet Carpet From Water Heater Leak and 15%-50% of those who are genetically susc  read more..

How To Keep Moisture Out Of Your Basement

TIPS FOR DRYING OUT A WATER-DAMAGED BUILDING F. Mitchener Wilds, Senior Restoration Specialist
 Once a building has been exposed to a large volume of water, either floodwater or rainwater, steps must be taken to dry the building out, assess damage, and Basement Drying How To Keep Moisture Out Of Your Basement plan for repairs a  read more..

Removing Smoke Odors From Fire damaged Furniture

The nonprofit NFPA's (National Fire Protection Association) Fire Safety Educational Memorial Fund Committee last month named the Seattle Hazmat Response Team, Seattle, Fire Damage Removing Smoke Odors From Fire damaged Furniture Washington as the 2004 recipient of the Warren E. Isman Educational Grant.

The team will use the grant to atten  read more..

Protecting Against Wind Damage

Protecting Against Wind Damage Protecting Your Home or Small Business From Disasters 3-8 Protecting Windows Installing storm shutters is one of the best ways to protect your home or Wind Damage Protecting Against Wind Damage place of business from hurricane damage. Purchase or make storm shutters for all exposed windows, glass  read more..

How To Clean Out A Trashed Apartment

Serving a Notice To Quit Notices of Termination of Tenancy (also called "Notices to Quit") from the landlord must be served on the tenant by: delivering the notice in person to the tenant or occupant; leaving the notice at the dwelling when the tenant is absent from the premises; or sending the noti  read more..

Storm Damage

If your home has sustained a significant amount of Dehumidification Storm Damage because the roof was damaged and the rainwater leaked through. There is a certain procedure that should be followed to minimize the possibility of any other damage like the growth of mold or any other structural damage. Your home should   read more..

Debris Removal

Did you know that nearly 3,500 children are injured or lose their life due to fires annually?  Some of these fires are a result of children playing with matches, lighters or candles. Without a doubt we need to educate our children about the dangers of Fire Damage Debris Removal. But we must be careful not to frig  read more..

The Effects Of Breathing Raw Sewage

Sewage Backup For the purpose of this Emergency Action Plan (EAP), a sewage backup means the overflow of sewage from equipment or plumbing facilities within a food establishment.The Food Code defines sewage as liquid waste that contains animal or vegetable matter in suspension or solution and may al  read more..