McKinney Roofing – Wind Damage, Part 5
McKinney Roofing – Wind Damage, Part 5
by Kenton Shepard and Nick Gromicko
WIND DAMAGE CHARACTERISTICS
- Direct and Indirect Damage
- Determining Wind Direction
- Material Condition
- Building Characteristics
- Mitigating Factors
Roof-covering materials — especially more brittle materials, such as tile — may be damaged by wind-blown debris called missiles. Missiles can include other roofing on the home which has been pulled loose by the wind and blown onto roofing on adjacent roof slopes, or tree limbs, gravel, yard apparatus, or anything else capable of damaging roofing that has been carried aloft by the wind.
Missiles aren’t always items that were laying around the yard. Anything that has blown through the air and damages the roof or siding can be called a missile.
This particular missile was flying through the air under its own power before it was caught in a strong gust and blown into the side of the house.
Material Condition
Wind will damage materials in poor condition before it damages materials in good condition. In addition to deterioration of the roofing material itself, fastening systems deteriorate. In some systems, such as slate, the fasteners may be the weakest part of the system, corroding to a point at which wind will cause them to fail.
BUILDING CHARACTERISTICS
The nature of wind damage is also affected by the characteristics of the buildings themselves.
The important building characteristics which affect the potential for wind damage include the following.
Age of Home
Many new building materials and methods have been developed over the past 30 years. At the same time, our understanding of how buildings operate and react to conditions has improved, and, as a result, building codes have become more stringent.
Type of Construction
Wind damage varies with the type of construction. For example, mobile and modular homes are more likely to suffer damage than homes with a more substantial structure and higher-quality materials.
Building Quality
Some types of roofing materials are more vulnerable to wind damage than others. The type and quality of both the installation and the materials used in the roofing system will affect the chances for wind damage.
Roof Shape and Slope
Roof structures of different styles obviously have different shapes. Each shape will affect wind behavior differently, as well as the location and amount of damage.
Wind blowing parallel to the ridge of a gable roof will blow along the roof-covering materials, offering less chance for damage than wind blowing at a home that has a hip roof. The exception is the potential for damage along the rakes, and the potential for inflation, if wind gets beneath the roof-covering materials.
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