They stay on long enough to wet the whole roof.
Soaker hose roof cooling.
Firesafe marin recommends that you replace any wood shake roof with a fire sesistant type a roof assembly but until that happens your house is the rare case a sprinkler might be helpful.
I would assume this would work in any climate where your roof got hot enough.
Expandable hose flex garden hose hot water use garden hoses 100 ft or greater garden hoses 3 8 inch rubber tubing flexible outdoor water pipe how doers get more done need help.
Coming from the faucet it goes into a coil of plastic pipe in a tub with misters spraying the coil.
We live outside of yuma az the feed water is pretty warm to start with.
The water that then goes up to the roof is cooler than it was coming out of the faucet.
Ours is installed at the peak of the roof and draining to both sides metal roof no.
Sure yukkuri the author took conventional lawn sprayers to the edges of his roof on the gutters.
We have soaker hose on our flat roof.
They can also be hooked up to a thermostat which causes them to spray when the roof surface is hot enough to warrant evaporative cooling.
Our houses are about the same size but his.
The hoses are connected to a sprinkler timer and come on six times during the hottest part of the day.
Likewise don t climb up on your roof with a garden hose.
Cooling with liquid water running off from a sprinkler is not efficient but evaporative cooling from a small amount of water like a periodic sprinkle is very efficient.
He put them to a timer.
1 gallon of water consumes 8000 btu as it evaporates.
Yes water on the roof will help cool it.