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How to prevent algae and moss stains from recurring
Most commonly algae and moss grow on roof surfaces that are shaded and remain humid. Cutting off tree branches that overhang the roof and block sunlight will surely help keeping your roof algae and moss free. Keep the roof surface clean by blowing off leaves and fallen branches during seasonal maintenance.
Long-term stain prevention can be assured by installing zinc or copper strips under the cap shingles, leaving about 6 cm of the surface exposed at roof peaks, along hips, and under the first course of shingles at the base of dormers. Copper and zinc are sacrificial metals that shed tiny fragments of their surface with each rainfall. The metals coat the roof and ban organic growth for many years.
>>> Picture 1 (left): The moss doesn’t grow close to copper metal flashing
>>> Picture 2 (top right): The red lines indicate where to install zinc or copper strips to prevent algae and moss growth.
>>> Picture 3 (top bottom): Ridge with Armourvent Multi and zinc moss repellent tape
Following these maintenance tips can help you enjoy your attractive roof. They can also help extend your roof’s service life, which is important whether you plan to stay in your home or sell it in the future.
More tips on the protection of your roof can be found in our blogs.
Good luck!
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You want to renovate? Or change the appearance of your property? Is the end of the life expectancy of your roof coming closer? Reroofing can be the answer!
When your shingle roof is nearing the end of its lifespan, it is probably the time for some big decision what to do. Decision must be made whether to remove the old shingles or apply new shingles directly over the existing layer.
It’s called reroofing and this is the process of recovering or replacing an existing roof covering.
With the exception of asphalt shingles, no other pitched roofing materials will allow you to perform the repair process directly over the existing roofing material. By using shingles you'll save time and money and you will manage the renovation process easier and faster. By using bitumen shingles for your roof, you'll reduce the impact on the environment.
Difference between reroofing and roof replacement
Roofing over an existing roof is also called reroofing or an overlay. It is the process where roofers install a new roof over your existing one, i.e. add a new layer of shingles, which means that there is no tearing off of the old roof.
Roof replacement is the process of installing a completely new roof that includes tear off of the old one. Roofers will tear everything off, down to the deck of the roof, and basically start from scratch with the new roof, from putting an underlay e.g. Armourbase Pro Plus and then installing shingles.
The replacement of roof involves much more time and labor which is more expensive than reroofing. When a roof doesn’t have underlying problems is an old and simply losing its function, reroofing might be a better solution as it involves much less work on your home, as well as less money
When is it better to put a new roof over an existing roof
When your roof starts to fail, but it is in an overall good condition, a reroofing might be the best choice for you. It means that your roof may be at the end of its life, but its underlying structures and wooden deck are in a generally good condition. Your shingles may be losing granules and are worn out due to age or weather, but they are not causing leaks, they are not curling or missing. These are all good predispositions for installing a new layer of shingles over the existing one.