You can use a blacklight to see the mouse urine at night which can help you find popular entry points.
How do mice get into the attic of a house.
Run your finger along the sill plate to look for cracks and fill with silicone caulk.
Mice like to travel in dark confined spaces so they can avoid predators.
There are many ways for a mouse to gain entrance into a home.
Seal up all of these entry holes using steel which mice can t chew through.
When mice climb up downspouts jump down from tree branches or access your roofline in some other way the first location they will find in your home is the attic.
You have to pay a lot of attention and look for small holes even as little as a quarter of an inch.
Scurrying and scratching noises especially in your walls and in your attic are usually the first sign you have mice in your home.
Once inside a mouse can scurry though any part of the architecture the walls the ceiling and get into the attic where they like to live and nest.
Your cavity walls are the ideal place for mice to use as routes through your home.
Mice can get into your house through cracks in the foundation.
If drainage pipes are not properly sealed mice may enter homes through sink or bathtub drains.
It just happens to be the first place they found.
Check the eaves the roof lines or vents to see if any mice could get in.
They are also known to find their way inside via entry holes around plumbing and oven gas lines.
You can also use a black light to identify a urine trail left behind by a mouse which may show you how they are gaining entry.