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Anatomy of house construction?

A few questions for construction folks out thereI'm ignorant on the subject, but am a first time homeownerIs all that's between laminate flooring and the ground/dirt is plywood, insulation, and the laminate? If so, why isn't there like a huge hard plastic barrier or metal or even concrete? Wouldn't that keep insects out better?Around my floor air vents, the small crack where the vent meets the floor.is this a direct path to under the house? A possible insect/rodent pathway? Should I place expandable foam there?I know walls are hollow (insulation and such inside), but at the bottom of the walls are they simply open to rodents and insects getting into them? I ask all of these questions because I'm paranoid of pestsFor the first time, we heard a mouse or something in our ceiling scratching at the woodProblem is, above the ceiling is NOT the attic, it's the up stairs floor so there's no way to set traps etc.I'm aggravated that it's even possible for something to get into that space in the first place!Thanks!

Answer:

Wash it with soda with hot water and lemonRough spot will be removed.
See if dry cleaner can fix it
Set a trap close to the wallRodents can't see well and they stay close to wallsRodents can get into any space their head can fit throughso basically any hole 1 inch or largerInspect the house exterior for possible holes and look for droppingsInspect the roof as wellAround stacks and things you can spray foam if you like to prevent rodents from enteringRodents are perfectly happy living in the attic, walls, and crawl space You need to take action to prevent them from penetrating the exteriorTo answer your questions, the floor is either slab (on top of concrete), or raised with wood 2 feet above the dirtThe walls are built on top of the floor with 2 2x4s on the bottom and top of each wallVents, electrical lines, and plumbing run through these 2x4s and may provide access for pestsYou can inspect them if you like and spray foamI would recommend catching the rodent first, and then sealing things upYou don't want the pest to die inside of a wallThen you have to deal with the smell for a whileDon't use poison for this reason, as wellCall an exterminator if you want and they will fix it all for youGood luck.
Try a good FLEXIBLE bristled hair brush - brush in the same direction and kind of flick at the end of the short sweepShould bring the lint off and fluff the blanket up a bit.

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