The second step is to quantify the damage on each directional slope by examining test areas.
Roof brittle test.
On roofs that have borderline hail or wind damaged it is important to perform a brittle test in order to determine whether or not the roof damage is repairable and may help you reach the 25.
Figure 4 an illustration of the brittleness test where a shingle corner is pinched.
If none of that happens pass.
In effect the test they employ is bending a shingle corner against itself 180 degrees and pressing down on the crease as is shown in the diagram below.
Each slope stands on it s own at this point until depends on carrier you ve hit the 65 rule.
Functional damage to roofing materials from hail has been defined as the diminution of water shedding capability or reduction of the expected service life of the roofing material 13.
That slope is not repairable due to brittle.
It is clear that such a test could cause damage to any shingle regardless of its age condition.
The entire roof area is then wetted with water which creates an electrical plate at the entire top side of the membrane when charged by the test unit.
U test the shingle by lifting bending it at a 45 angle.
If the shingle breaks then the shingle is brittle and the roof probably needs to be replaced.
It is then raised and lowered 45 degrees three times.
That slope is repairable.
The brittle shingle test is a super scientific testing method whereby an inquisitive person picks up a shingle tries to fold or bend the shingle up to a 90 degree angle and then checks to see if the shingle breaks or bends.
According to underwriters laboratories a brittle test or wind resistance test is conducted by lifting a tab 90 degrees and if during the test the shingle shows no permanent damage then it passes.
The brittle shingle test.
In this electrical circuit the membrane acts as an isolator between the positively charged electrical plate on the membrane surface and the conductive deck which is considered the ground.
During a brittle test and the shingle is loosened at its lower edge from the shingle below it.
However if during the test the shingle creases tears cracks or splits the shingle has failed the test.
If a homeowner has no concerns with heights in general climbing a ladder or walking on a roof there is a simple procedure that can be used to test for brittle shingles.
