a roof ceaned annually gathers no moss... or does it?

The safest for the roof is to burn it(chems..NaOH or NaHCl) then let it die on it's own. Most people want it gone immediately so I kill it then very carefully with low pressure remove about 90% of it. Some of it sticks so hard that I think it is detrimental to the roof to remove all of it. The downside is leaving it on is bad for the roof as well.
Most of the calls I get for this are because their insurance agent has seen the moss and is threatening to drop their coverage if it is not removed.
 
The thick stuff has roots that are buried in the granules of the shingle. If you try to dislodge them, you will likely remove the granules as well - leaving ugly spots where the asphalt shows. If you kill it (chlorine), it will die immediately, but over time (months) the roots will lose their grip and wash off in the rain.
 
John Orr said:
The thick stuff has roots that are buried in the granules of the shingle. If you try to dislodge them, you will likely remove the granules as well - leaving ugly spots where the asphalt shows. If you kill it (chlorine), it will die immediately, but over time (months) the roots will lose their grip and wash off in the rain.
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Hello John!
I am hangin out here now, on the roof cleaning forum mostly.
Living in Seattle for many years, and being a roofer by trade, we saw Moss on a daily basis.

We simply sprayed it with Copper Sulfate, and let it die.
The rain will rinse it away usually.
But if the homerowner signed a relaese, we gently power washed it off.

Moss can fllat out ruin a roof, if left unchecked.
 
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