Here in Dallas Fort Worth there are a lot of big old trees. You can here the acorns hit my Gerard roof when you're outside, but not inside. Everybody, except for a select few, know to clean their gutter but there is more.
Leaves build up in valley and out of sight behind the chimney. If you don't have a cricket behind your chimney you won't have any galvanization on the metal pan flashing behind the chimney either. All you'll have to protect the metal is the rust and wet compacted leaves.
So if you need to clean your yard or gutters, you'll probably need to at least inspect your roof.
Then there are the microbes. An air borne fungus that loves to eat asphalt commonly known as slime mold will make the roof ugly and old. The mold wants to get to the organic base of the roofing, asphalt. To do so it must get past the granules that are designed to protect the asphalt from ultra violet degradation.
I don't care what the so called experts say. I am the one and for years we've been doing what they say not to do. Wet the roof with a little diluted bleach and then hit it with a very low pressure water stream. If you set it to kill you can blast yourself through the masonry and create a new portal into the home.
We bought a cheap pressure cleaner at Harbor Freight Tools that can't even be set on stun. They can't tear off the roof with this. It is not a crowd control device.
This will last a couple of years but there is an easier way. Go cut a couple of piano wires out of the baby grand and tuck them along the ridge on the effected side and the roof throat lozenge will keep your roof happy, healthy, and wise.
Don't fall off because even if you land on your feet it'll hurt because its cold (and a long way). Plus wet roofs are slippery.
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