The location you mention is a typical mud dauber nest site.
Mud nest in attic.
Mud daubers belong to different families and are variable in appearance.
Often times you d spot their nests in window cracks up on the ceiling inside the floorboards or even in between kitchen tiles.
Examine nests which are made out of mud typically constructed of.
Female mud daubers construct nests of mud.
Different females may build nests in the same general area on your home.
Common sites for a wasp or hornet nest include under the roof eaves behind shutters or in garden sheds.
Most of the time you find nests attached beneath roof eaves inside attics or beneath the eaves of wood or garden sheds.
Mud daubers prefer to build their nests on wood surfaces in shady protected areas like under porch roofs under eaves in sheds or attics.
Mud nests can be scraped up with a putty knife and thrown away while paper nests are easily brushed off with a large grill brush.
Mud dauber nests are often found on the side of buildings under overhangs on front porches in barns or inside caves to protect themselves from the rain.
They usually build their nests in a sheltered site such as under eaves porch ceilings in garages and sheds left open in barns and attics etc.
Search carefully for nests in areas preferred by dirt daubers including garages attic spaces or areas beneath roofs or eaves.
Mud dauber or mud wasp or dirt dauber is a name commonly applied to a number of wasps from either the family sphecidae or crabronidae that build their nests from mud.
Wasp nest identification is not that difficult.
Most wasp nests are small in these locations but some can be as big as small gray papery balloons hanging from tree limbs.
Because of their tendency to nest in the most well hidden places their nests are almost impossible to locate without help from pest experts.
Look for loose shingles or boards which can allow insects to enter your home.
To locate the nest watch the flight path of returning wasps.
Many short mud tubes usually about 1 long are constructed side by side.
Wasps especially mud daubers are notorious for choosing the narrowest most unreachable corners to nest.
Here are the key places to inspect around your house to avoid attracting pests.
The organ pipe mud dauber constructs nests that look like long thin pipes while other mud daubers typically create urn shaped nests.
If the nest is near the home keep nearby windows closed.
Ridding your attic of all traces of nest will not only give you a cleaner home but can keep any new wasps from being drawn to an existing nest.
Most resemble long slender wasps about 1 inch 25 mm in length.