Class4 - Impact Resistance shingles

928 Views 4 Replies 4 Participants Last post by Windows on Wash, Apr 19, 2016

mail2jayram

Discussion Starter · Apr 19, 2016

hello , I'm in TX area and getting thru contractors for full roof replacement after hail storm. Some has offered Class4 shingles @ 2K more than regular shingles.

Besides the $$ factor (initial cost and insurance discounts), what factors should one consider deciding on Class4 shingles?
a. weight of the shingles - 250LB per square for regular. Does the Class 4 weigh heavier? If so what does a 20 year old house need to have necessary support system

b. between GAF Timberline vs. Certainteed Landmark vs. OwensCorning Duration line, which one is a better class4 shingle product for TX weather?

c. Does installation need 6 nails vs. 4 nails for class 4 shingles ?

what other factors (again besides money factor) should one be aware on this front?

hoping to get some assistance.

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Windows on Wash

· #2 · Apr 19, 2016

I think impact rated asphalt shingles are worthless if you ask me. I haven't seen any data on them to indicate that the granules won't come off long term and if you have hail that is large enough to penetrate a regular shingle, the roof is going to be smoked either way.

I would rather have metal or something composite on there.

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craig11152

· #3 · Apr 19, 2016

There is a UL standard for impact resistance and I would argue its far from useless.
But a $2000 upgrade seems very pricey. I would be inclined to contact local shingle suppliers as a DIY homeowner and see what the mark up is on class 4 shingles. A quick peek at Certainteed suggests they have a several class 4 options including a 3 tab (XT 30 IR).

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Bud9051

· #4 · Apr 19, 2016

Since you do get a lot of sun down there, be sure to check the reflectivity of the new shingles. Some can significantly reduce the heat that gets into the attic.

Bud

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Windows on Wash

· #5 · Apr 19, 2016

craig11152 said:
There is a UL standard for impact resistance and I would argue its far from useless.
But a $2000 upgrade seems very pricey. I would be inclined to contact local shingle suppliers as a DIY homeowner and see what the mark up is on class 4 shingles. A quick peek at Certainteed suggests they have a several class 4 options including a 3 tab (XT 30 IR).

Useless was probably a strong choice of word on my part.

Here is my point, if a missile that is both strong and fast moving enough to penetrate a non Impact rated shingle, it is severely damaging and impact rated unit as well.

The impact resistant matting is at the base layer of the shingle and has nothing to do with granule technology or adhesion. If the shingle gets walloped hard enough to where it is going to break through, the exterior is smoked on either one of them and the roof is toast.

That was my point.

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