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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 by the bat guano (droppings) in
the attic, it is advised that the areas of insulation 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
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