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Metal tin roofs are much like the cedar shake
roofs.  Bats usually roost under the ridge caps.
Occasionally they may find a gap where roof
sections may overlap such as in dormers and
crickets.  Metal roofs tend to heat up faster than
tiles so bats may favor this type of roof around
the colder time of year to keep them warm during
the winter months.   To secure a metal roof from
future bat infestations all the ridges need to be
sealed after an exclusion is performed on the
affected areas.
Bats roost under the ridges of metal tin roofs.  
Mouse over to see a bat under the ridge.
Metal Tin Roofs
Unlike the barrel tile and the cedar shake tile, Asphault shingle tiles are glued to one another
so it is impossible for the bats to crawl underneath them.  On asphalt shingle roofs, bat are most
likely to roost behind gapping fascia boards or in gaps or holes in the sofit area of the roof.  In
this case bats would have access to the attic.  Most bats will stay in close range to their entry/exit
hole, and seldom wander around the attic freely.  Because of the potential health hazard posed
the feces and urine be removed and replaced with new insulation once the colony saturated with
the feces and urine be removed and replaced with new insulation once the colony has been
moved.
Bat guano inside the attic on the insulation.  This
insulation was removed and replaced by new one.  
Mouse over the image to view new insulation.
During this exclusion, bats can be seen crawling out
from behind the green fascia board.  Mouse over the
image to view the colony from inside the attic.
Industrial Asphalt Shingles
Cedar shake is another type of roof which bats
often roost in.  Unlike the barrel-tile roofs, bats
can only roost under the ridge caps.  Because the
ridge tiles sit on top of each other overlapping
forming a tunnel it is a great place for bats to
establish a colony.  Entrance to the ridge caps
could be found anywhere up and down the entire
length of the ridge.  Sometimes there could be
several entrances so locating them is important to
avoid trapping bats in the roost. The remedy to
this type of roof is performing an exclusion where
needed and then sealing off all of the ridge caps
to prevent the bats from moving into another
section of the roof.
Here you can see guano droppings falling out from
underneath the ridge cap where the bats were roosting.
Click to enlarge image.
Most bats live underneath tiled roofs.  Barrel tiles or "Spanish Style," are the preferred  type of
tiles to form colonies under.  Bats roost underneath the tiles which lay on top of the plywood
decking.  Contrary to popular belief, bats do not roost in the attic space with this type of roof.  
They congregate under the tiles finding an opening which may be as small as 1/4 of an inch wide.
Once under the tiles they can spread out taking up as much room as needed to accommodate the
colony.  Most bats prefer lighter colored tiles in the summer and darker colored tiles in the winter.  
A common area for an entry point into a roost is
the wrap-around tiles on the edge of the roof
near the peak.
Slate style roofs are the most difficult type to bat proof.  
The entire roof must be sealed at every little gap to prevent
the bats from finding another way in.
Ridge caps must be sealed to prevent
bats from entering the roof.
Cedar Shake Roof
Bats & Residential Homes
Tile Roofs