Wind Zipper Pattern Roof

The shingles that exhibit these damages may be examined further for additional information.

Wind zipper pattern roof.

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. Irc table r602 3 1 footnote f g. This tool enables you to determine the expected wind uplift pressures on a roof as well as the fastening patterns required to attach the roof system to resist these pressures. 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.

Frequently asked questions and answers about how to assess repair or prevent wind damage to roofs. Luis esteves of adjusters international forwarded this photograph depicting a zippering roof during a windstorm. Are these displaced shin gles the result of wind forces or from slippage. Are there adjoining shingles that have.

This article series discusses how to evaluate wind damage to asphalt shingle roofs and tells readers how to identify explain the most common failure mechanisms such as improper nailing failure of shingles to seal. During your roof assessment have you identified displaced shingles on the roof. Roof wind damage assessment and caused for asphalt roof shingle defects. Wind interacting with a roof is deflected over and around it.

We have heard for years from the carrier s that zippering is always a condition of bad installation and not wind uplift. Image 4 image 3. As a result uplift pressures develop on the roof. The result was a zipper like pattern of missing tabs that extended upslope from the eaves to the ridges fig.

Wind damage on multiple roof slopes facing multiple directions requires wind to have traversed the roof from multiple directions. Wind damaged roof faqs. When wind speed is 100 mph or greater block panel edges perpendicular to gable end wall framing members in the first two bays of. Well here is the smoking gun.

How to recognize asphalt roof shingle or other roof type damage by wind hurricane storms and how to get. However uplift pressures are not uniform and are. 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. After collecting pertinent information about the project the pressures and fastening patterns will be calculated and made available to you in report form.

Some problems stem from environmental temperatures. 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 review of surrounding objects for wind damage the review of the pattern of the damage and the close up examination. These unbonded overlaps will not vary in direction or increase decrease in areas of the roof where wind uplift would be greater less.