Originally Posted by drewdin
I am going to be Insulating the crawl spaces and basement with Batt insulation, my question is that since I'm using batt insulation how can I prevent it from falling down or getting insulation on everything over time?
Should i put 1/4 blue foam board under it or do something similar? If you want pics let me know but i don't have insulation up yet.
The first Law of Thermodynamics is: heat always moves from hot to cold.
I assume that you really want to keep the heat inside your living space?
Presumably the crawl space is cold and not used for living?
So the heat moves from your living space, into the floor by radiation and conduction then into the joists and then the cold air inside the crawl space, the crawl space walls and floor.
To get the best result, keep the heat in your living space, the insulation must be above the floor. That means sheets of closed cell insulation, like polystyrene, laid on the existing floor with a fully floating floor on top.
Placing insulation below the floor, is an almost complete waste of money and time, as wood is not a good insulation, and your expensive heat is quickly passed into the joists, cold outside air, crawl space walls and ground.