Wind Zipper Pattern Roofing

When shingles start lifting in a uniform diagonal stairway pattern they are known as racked when they lift in a straight up line like a zipper it is known as zippering go figure.

Wind zipper pattern roofing.

Many times after the wind leaves these zippering impressions the shingles will reseal however they reseal at a severely diminished value approximately a 90 diminished uplift resistance value. Wind damage to asphalt shingles installed in the racking or straight up pattern after hurricane frances. The height of the roof and exposure and risk categories are factors that are used to convert design wind speed to an uplift pressure. It was found that three tab asphalt shingles did not.

How to recognize asphalt roof shingle or other roof type damage by wind hurricane storms and how to get. Photos and text guide diagnosis of asphalt roof failures how to identify and explain roof shingle failures obtain claims assistance contribute failure information at this website. The following is a list of questions to consider when you as the inspector are assessing a shingle roof for reported wind damage. Joints of underlying shingles.

Where creasing bending flipping tearing punctures dislodging or nail head pull through occur on roof slopes in multiple directions the pattern indicates that the damage may be a result of multiple events some of which may be excessive winds. These unbonded overlaps will not vary in direction or increase decrease in areas of the roof where wind uplift would be greater less. During your roof assessment have you identified displaced shingles on the roof. Image 4 image 3.

An unbonded pattern of shingle tabs in a racked installation is commonly referred to as zippering chalk lines in figure 6 show the nonbonded shingle portions. When wind speed is 110 mph or greater and when median roof height is between 25 and 35 feet use 8d ring shank nails 0 135 x 2 1 2 inches within 48 inches of gable end walls. The result was a zipper like pattern of missing tabs that extended upslope from the eaves to the ridges fig. Wind loads are based on the design wind speed which is based on the geographic location of the building height of the roof exposure category roof type enclosure classification and risk category.

Are there adjoining shingles that have. All heritage series roof covering have a random cut saw tooth design to prevent the unsightly zipper pattern. When wind speed is 100 mph or greater block panel edges perpendicular to gable end wall framing members in the first two bays of. Are these displaced shin gles the result of wind forces or from slippage.

The shingles are made with a double layer of fiberglass mat for strength and weather resistant construction. Irc table r602 3 1 footnote f g. We can t blame all roofing repair on the wind. The dirt and debris that will inevitably get embedded into the exposed mastic cannot be cleaned thoroughly enough to ever be reusable.