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Question DetailsAsked on 8/9/2016

How to extend the life of asphalt shingles

Now, I just have finished to reroof, and because my roof is such low pitch (2:12), so even with the shingles which suppose to last 25 years, it will last only 15-17 years.

I have heard that the product: RoofKeeper Elastomeric Shingle Coating made with acrylic elastomeric resin by TechniSeal will extend the life of shingles, because it help to keep the granules on the shingles.

If you have any experience or comments about this product, I'd like to hear from you. Any advice?

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1 Answer


Have not seen this product specifically, but have seen similar products:

1) the material itself appears to be same as or similar to that used to rejuvenate sheet roofing, which have been in use for a couple of decades - generally does coat the surface and probably provides some life extension, but is not immune to weather cracking so while it probably limits water intrusion, will nto stop it totally - especially on a low slope roof

2) in my opinion, this type of product makes it look like the roof has been smeared with a coating - gives it a "painted" or commercial rather than coarse-surfaced shingle look, and is shiny for at least initial part of its life

3) you need to be certain it does not seal the bottom edge of the shingles to the ones below such that it prevents any accumulated water from running out from under the shingles. So while applying there should be a gapper slipped in under the shingle being coated to prevent it bonding until it dries - which would really slow down the work and raise costs.

4) will trap moisture in the shingles, so especially if organic-based fiber rather than fiberglass i would expect it to promote moisture degradation and swelling of the shingles rather than extend the life. Same sort of issue as solid paints and epoxies and such have on wood decks - the liquid water gets in through microcracks (or by flowing in under the shingles due to the low slope), but cannot evaporate out as water vapor through the "painted" surface, effectivelyi trapping the water and creating a so-called "pressure cooker" environment where it maintains a damp environment conducive to decay.

5) I think you need a new roofer - any roofer who will put asphalt (or pretty much any type) of shingles on a 2:12 slope deserves to lose his license, in my opinion. 4:12 is the normal minimum roof slope recommended for shingles - I would not be surprised if the manufacturer warranty, or at least any water protection provisions, were voided due to use on such a low slope roof.

My recommendation - do not treat the shingles, wash annually or as needed to remove debris and dirt to limit moss and algae growth, treat (spot or overall as applicable) with Lilly Miller Moss Out powder as needed (typically every couple of years) to stop moss/algae growth, and when the shingles start going south either replace with a low-slope sheet or raised seam metal roofing material or, if so inclined (no pun intended), go whole hog and steepen the roof to 4:12 or steeper and reshingle at that time. [Not that I am recommending that measure unless committed to shingle roofing, or intending to create usable attic space, add major dormers, etc at same time, because certainly WAYYY more expensive than just changing roofing type]

Answered 3 years ago by LCD

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