Removing Algae and Moss Off the Roof


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What is the best method to remove blue-green algae or moss from asphalt roof shingles?

Thanks
 
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I very seldom advise people to not do a project themselves but this is one item best left to the pros. Why? Because they have the proper chemicals and pressure equipment to do the job right without damaging the shingles. They will be able to do the job without killing all the plants and grass. Be sure to get references and preferably hire someone with several years experience.
 
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Hi,

Excellent advice Doug and it can even go wrong with highly reputable roofers. 30 years ago Bron and I replaced the entire roofs to our bungalow and two roomed rear extension. The main bungalow we converted to tiles but the extension we covered with Nuralite sheets these being semi rigid mineral fibre bitumen sheet material and thought we could relax. A short while later we returned home to find the Nuralite was now painted silver? A very well respected roofing contractor had got the wrong bungalow; we could have cried after all the work we'd put in; the Nuralite had to be stripped off and replaced; the contractor apologized and offered to do the job but we just accepted the Nuralite and we re-did the work. Typical of our bad luck.

A few years ago I bought a 120 bar Nilfisk pressure washer and this to me was a big boys toy it being my "light sabre" having blasted everything at ground level I thought the roof is looking shabby so I also blasted the roof tiles and what a tremendous difference this made; the amount of dirt removed was incredible but I definitely don't recommend anyone doing this because it could be highly dangerous; our's is a bungalow with a 12.5 degree pitch roof so I was safe to do the work. I didn't even try to pressure wash the Nuralite. Pressure washing shingles though would destroy them; I tried pressure washing the tarmac path to the roadside and it easily damaged the path so in your case Kemper100 I would do as Doug suggests and get the professionals in.

Kind regards, Colin.

Pressure washing_001.JPG


A big Scots Pine tree was overhanging the roof so I felled the tree but was left with this unsightly mess.

Pressure washing_002.JPG


It was backbreaking pressure washing the roof tiles but what a tremendous difference.

Pressure washing_003.JPG


The main bungalow roof tiled and the extension roof in Nuralite; pressure washing brought the tiles up like new; I also built the new chimney stack and added a stone arch above the kitchen window to replace a very rusty metal lintel. I DON'T RECOMMEND PRESSURE WASHING A ROOF BY A NOVICE IT'S MUCH TOO DANGEROUS.
 
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Imagine you're climbing the roof for cleaning and you end up damaging the shingles! Hence, DIY is certainly not a choice. I think professional help should be preferred. Go for a handyman. They charge relatively less fees.
 
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