Abbot Roofing

FAQs - Roofing Ottawa

What is the best type of shingle for my roof?

Shingles range from 25 yrs to limited lifetime shingles

Is it possible to put a new shingle roof on top of existing shingles?

We never install one layer over another layer, it voids any warranties and makes it impossible to seal a water barrier to the roofdeck.

My roof is streaked with black stains. Is there a solution to get rid of them?

The dark streaks are a type of algae that lives off the minerals in certain types of roof shingles. Algae thrives in moisture, so it’s seen most often on shaded or north-­facing roof slopes that often are deprived from the direct sun. While it’s true that algae doesn’t damage roofing, it looks bad. To get rid of it, use a pump sprayer to wet down the roof with a mix of one part bleach to two parts water. Bleach will damage foundation plantings, so be sure to rinse them well with fresh water before you start and also after you’re done. Some shingle manufacturers now make AR shingles which stands for algae resistant. We can also install zinc strips to the roof to help prevent and kill mold and algae.

What roof will last longer, a roof with a steep pitch or one with a shallow pitch?

Roof facets facing south or south west are the ones that age the quickest. After that, we look to proper insulation, ventilation and vapour barrier in the attic. Ice on the roof will also rub the stones off the shingles and lead to degradation of the shingles. Any roof less than a 4/12 pitch will age prematurely.

How to tell when an asphalt shingle roof needs to be replaced?

There are several clues, and the biggest clue is age. If your roof is more than 20 years old, there’s a good chance you’re in need of a new roof. But younger roofs can fail as well, so it’s a good idea to inspect a roof at least once a year. Don’t use a ladder, though. Binoculars are much easier and a lot safer, and you can spot most problems from the ground by using this method.

Ottawa Roofing Services

Roofing Excellence in Ottawa Since 1987

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