Roof Cleaning · San Luis Obispo
Roof Cleaning in San Luis Obispo
A San Luis Obispo roof gets wet on nights the yard underneath it stays completely dry. The afternoon then dries the faces the sun can reach and leaves the pans and the course laps damp, which is where growth in this town starts and why it starts out of sight.
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The roof wets every night, and only half of it dries
A roof is the one surface on a house with nothing above it. After dark it radiates heat straight up to the open sky, drops below the temperature of the air around it, and pulls moisture out of that air on nights when the lawn, the driveway and the walls all stay dry. In San Luis Obispo, with the marine layer pushing up the valley most nights, that happens more often than not. Count the wettings across a year and the roof has taken several hundred more than anything else on the property, without a single one of them showing up as weather.
Then the heat arrives in the afternoon, and that is where people misread a roof here. By early afternoon the exposed face of a tile is warm and dry and looks like it has been dry since dawn. The pan it sits in has not. Neither has the few inches tucked under the head lap, or the shaded step where one course rides over the next. Those are the parts of a tile roof that direct sun never reaches at any hour, so what condensed at four in the morning is still sitting there at noon for most of the year.
That is why growth here does not arrive as a wash of black down a whole slope. It starts as a green line along the course laps and as dark seams in the pans, working outward from the shadow rather than downward from the ridge, so a San Luis Obispo roof can look perfectly acceptable from the sidewalk while it is already well underway. Winter then widens it. A low December sun throws the shadow of each course further down the tile below it, so the strip that never dries grows instead of shrinking, in the same weeks that carry the rain.
What changes in San Luis Obispo
The roof does not belong on the schedule the walls are on
Owners put one plan over the whole building, wash the stucco and the concrete, and hand the roof the same interval. The walls of a house here are comfortable on two or three years. The roof above them is collecting water on nights nothing else on the property gets wet, so the same number quietly puts it years behind the rest of the building.
The middle of a slope is the wrong place to look
On a San Luis Obispo roof the first sign shows at the course lines and in the pans, where each tile overlaps the one below it. From a driveway those surfaces are edge on and effectively invisible, which is why a roof that reads fine from the street is still worth someone going up and looking along it.
In winter the roof stops getting a dry afternoon
Through summer a San Luis Obispo roof condenses at dawn and the exposed faces are dry again by two. From November into February they stop drying between storms and the pans hold water for weeks together, so growth that ran in short bursts the rest of the year runs continuously. Most of a year's damage is done across those four months.
The north slope rule does not hold in this town
Most towns have a growing side of the roof and a clean side, and on a San Luis Obispo tile roof that is not much use. Dew condenses on every plane, the south one included, and every plane has the same pans and the same course laps to hold it. Growth here follows the course line rather than the compass.
How often, here
Three to four years is the usual interval on a San Luis Obispo roof, and the month carries as much weight as the number. Nearly all of a year's growth banks between November and February, so the useful time to look is August or September, going into that stretch rather than coming out of it. A roof cleaned in March has already paid for the year it just had. The other thing worth saying is that the calendar has to do the work an inspection would do elsewhere, because on the tile that covers much of this town the honest answer from the driveway is that you cannot tell.
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Questions from this area
Why is my roof growing moss when the rest of my San Luis Obispo house looks clean?
What is the green line running along every course of my tile roof in San Luis Obispo?
When is the best time of year to clean a roof in San Luis Obispo?
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