Spray foam pest block works great for keeping mice out! My mother's house is located next to a large field. She was getting mice in the house on a regular basis. When they started developing the field, I had to come over and clean the snap traps every couple of days.
I found the critters chewed through the regular gap filling foam and so I filled it with the pest block and haven't had a problem since. Its been over 6 months now and not a problem.
As for spiders, look at your windows. Mine have these small openings at the bottom of the windows to allow fresh air in and maybe let out the moisture. On mine they go directly outside and I can feel the airflow. Maybe check that?
Also, I found gaps in the registers from the heating ducts from under the house. The spiders/critters get in through the vents under the house and find there way up those small cracks. I have since sealed them. I have heard of folks placing a couple cans of the pest spray bombs under the house to kill them there.
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