Wind Zipper Pattern Roofing

Are these displaced shin gles the result of wind forces or from slippage.

Wind zipper pattern roofing.

Irc table r602 3 1 footnote f g. Are there adjoining shingles that have. 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. Image 4 image 3.

During your roof assessment have you identified displaced shingles on the roof. Joints of underlying shingles. The following is a list of questions to consider when you as the inspector are assessing a shingle roof for reported wind damage. The featured self sealing asphalt strip provides added wind resistance.

These unbonded overlaps will not vary in direction or increase decrease in areas of the roof where wind uplift would be greater less. It was found that three tab asphalt shingles did not. 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. Some problems stem from environmental temperatures.

How to recognize asphalt roof shingle or other roof type damage by wind hurricane storms and how to get. The result was a zipper like pattern of missing tabs that extended upslope from the eaves to the ridges fig. All heritage series roof covering have a random cut saw tooth design to prevent the unsightly zipper pattern. 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.

We can t blame all roofing repair on the wind. 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 height of the roof and exposure and risk categories are factors that are used to convert design wind speed to an uplift pressure. When wind speed is 100 mph or greater block panel edges perpendicular to gable end wall framing members in the first two bays of.

Wind damage to asphalt shingles installed in the racking or straight up pattern after hurricane frances. Roof wind damage assessment and caused for asphalt roof shingle defects. 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. 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.