This steel ball must hit the field area of the shingle two times and the edge of the shingles two times without damaging the mat to qualify for a particular class rating.
Level 3 4 roofing.
They re slightly thicker and made to resemble more expensive wood shakes.
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Class 1 would be the lowest tested rating.
Low profile head reduces damage to installation and single ply membrane when attaching to steel or timber.
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A class 4 roof covering receives the highest premium credit.
The list of approved laboratories is shown below.
However due to the various benefits of class 4 impact resistant shingles the extra cost upfront may be a worthwhile investment if you live in an area where hail and wind storms frequently occur.
Standard entry level 3 tab shingles are the cheapest and thinnest.
As you contact various contractors or suppliers you should ask about roofing materials that meet ul standard 2218.
Architectural shingles are a step up from 3 tab shingles.
Roof coverings that have passed the ul standard 2218 test are classified by ul as either class 1 2 3 or 4.
Available in a diverse selection.
Roof coverings that have passed the ul standard 2218 test are classified as either class 1 2 3 or 4.
Class 4 roofing shingles are considered to be a premium product and therefore may cost more than standard non impact resistant shingles.
A fiberglass mat has proven to be a more sustainable effective product.
A class 4 rating the material should not get damaged when hit twice in the same spot by 2 inch diameter steel ball.
Summarizing the result we would be looking at for a class 3 roof is earned if the sample does not crack when hit twice in the same spot by a 1 75 inch diameter steel ball.