Wind Zipper Pattern Roofing

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.

Wind zipper pattern roofing.

Irc table r602 3 1 footnote f g. Are there adjoining shingles that have. The height of the roof and exposure and risk categories are factors that are used to convert design wind speed to an uplift pressure. The shingles are made with a double layer of fiberglass mat for strength and weather resistant construction.

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. When wind speed is 100 mph or greater block panel edges perpendicular to gable end wall framing members in the first two bays of. The result was a zipper like pattern of missing tabs that extended upslope from the eaves to the ridges fig. 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.

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. During your roof assessment have you identified displaced shingles on the roof. The featured self sealing asphalt strip provides added wind resistance.

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. Are these displaced shin gles the result of wind forces or from slippage. All heritage series roof covering have a random cut saw tooth design to prevent the unsightly zipper pattern.

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. Joints of underlying shingles. The dirt and debris that will inevitably get embedded into the exposed mastic cannot be cleaned thoroughly enough to ever be reusable. The following is a list of questions to consider when you as the inspector are assessing a shingle roof for reported wind damage.

We can t blame all roofing repair on the wind. 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. Roof wind damage assessment and caused for asphalt roof shingle defects. It was found that three tab asphalt shingles did not.