Bats would much rather drop down a wall void and occupy an area with a warmer temperature than stay up in the attic space where it’s cold. The attic space in most houses is above the insulation, out of the "thermal envelope," and therefore gets very cold during winter months. My theory is that these bats drop down walls in the winter to find a comfortable temperature zone. Why did these bats choose to drop down the walls from the attic? He began to tear down the sheetrock walls, and when he tore off the first piece he found three hibernating bats stuck to the slats inside of the wall-void. He told me that he was beginning a home-improvement project in his kitchen on the first floor of his 1925 Victorian house. On January 2nd 2006 I received a call from a man in Sudbury Massachusetts. Bats squeeze into this gap in the attic and drop down into the lower levels of the house. Around the chimney there is a gap where the brick is cut through the framing of the house. Just about every house in our area has a chimney, which stretches from the roof to the basement where it attaches to the heating system. The bats are able to travel up and down these wall-voids from the attic to the basement.Īnother way for bats to descend into the living space of a house is via the chimney. From the attic, you could drop a golf ball behind a wall and it would land in the basement of the house. This means that the walls of the house are hollow with no fire blocking (walls in houses were not insulated back in the early 1900’s). These older houses were constructed with "balloon framing" methods. We typically find them hibernating in the walls of such houses. These bats seem to prefer to hibernate in large Victorian and Colonial style houses in the greater Boston and Providence areas. Large browns hibernate in attics and in other voids within a house during the winter months. Large brown bats in Massachusetts and Rhode Island are year-round residents. These small brown bats will leave the caves in the spring to migrate north to New England. When the cold weather arrives in the fall, the small browns will migrate to caves in the mid-Atlantic to spend the winter with millions of other bats. Small brown bats are seasonal, arriving here in the spring and staying for the summer. Massachusetts and Rhode Island are home to two species of bats: the small brown bat and the large brown bat.
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