Absolutely. Moisture from the ground (or even concrete floor as water seeps through) will rise up and saturate the crawl space area with moisture. Anything organic in the space- including wooden beams and insulation- runs the risk of growing mold and rot, eventually affecting the structural integrity of the home and overall healthiness. Additionally, termites can enter and devour the moist wood, and mold spores will rise into your home. (This is much more common than many people think- warm air exits out of the upper levels and cool air is sucked up through the crawl space). Unsealed crawl spaces will also bring humidity into the house and be a perfect place for rodents to live and die in. Definitely put something down. And if you have a vented crawl space, you should look into sealing those vents if local housing codes allow for it.
1,000,000,000 dollars
As much as it costs
It cost approximately $10,000
how much does it cost to form and pour concrete in Mobile, AL
The average cost of a space shuttle mission is $450 million
450,000,000
abonch
About 30,000,000 rand
It depends on your shoe size and where you get it from
A lot
I don't know sorry
To make a space probe it can cost from 154-328 million dollars. :)
It costs about $100,000 per pound to send something to space.
$1.63 billion
$5
400