Understanding Impact-Resistant Shingles (Part 2): Class 4 Rating

This is the second part of the blog about IR or impact-resistant shingles. In the first installment of this 2-part blog post, we discussed the basics of IR and mentioned CertainTeed as one of the best providers of this kind of material. In this part, we’ll discuss UL (Underwriters Laboratories) 2218 Class 4 impact-resistant shingles and the certification needed to install such material.

UL 2218 Class 4 is the highest possible rating for durability of impact-resistant shingles. This is because it is made primarily to withstand external impact as shared by blueprintforsafety.org:

The UL 2218 test standard uses steel balls ranging from 1.25 inches to 2.0 inches in diameter. The steel balls are dropped from heights of 12 feet for the 1.25 inch ball to 20 feet for the 2 inch ball. Although this apparatus tests for impact resistance, not hail resistance, the impact of the steel ball simulates the impact energy of free-falling hailstones. The test assembly is struck with the steel ball twice in the same location on the assembly. To meet the acceptance criteria of UL 2218, the roof covering material exposed surface, back surface and underneath layers must show no evidence of tearing, fracturing, cracking, splitting, rupture, crazing or other evidence of opening of the roof covering layer. Qualifying assemblies are given a class rating depending upon successful performance of the assembly under impacts from the varying sized steel balls.

If these materials can withstand steel balls then it is safe to assume that it can effectively protect our home from harsh weather systems like hailstorms and thunderstorms, and wind-blown debris.

While it is something that every homeowner should have, not all contractors are certified to install them. For your roof and gutters in Colorado Springs, we have factory certification for installation.

We at AquaDuct, one of the premiere companies for roof and gutter installation in Denver, are contractors certified as a CertainTeed Master Shingle Applicator. This certification allows us to install the CertainTeed Landmark™ Impact Resistance Shingles which is a Class 4 shingle. We always make sure that our fellow homeowners with get the best protection that is why we underwent trainings to acquire this certification. If you want to know more about CertainTeed’s Landmark™ IR Shingles, click here to go to the first part of this blog: http://www.aquaductroofing.com/understanding-impact-resistant-shingles-part-1-the-basics/

(Article Excerpt from Impact Resistant Roof Coverings, Blueprint for Safety, n.d.)