Nice job with the insulation, I put unfaced batts in the floor joists and now im going to put 2" closed cell foil faced foam board on the walls using the fire block suggestion above. Only half done but crawling on the floor in 2 feet of space is my favorite!
Thanks.
I assume that you do not have your HVAC unit in the crawlspace? You got a 'Boiler"? not exactly sure how that works but I assume it heats water and runs it through a piping system and radiators through the house? Maybe there is a way to add a radiator in the crawlspace for winter?
BTW it would seem that boiler noise would be sort of impossible to abate because the noise will just go through all that piping and water, but I don't know never been in a house with a boiler.
If you did then you would be much better off NOT putting the batting in the floor joist, just insulate the walls.
The reason the old owner had his insulation fall out is because he did not put down a vapor barrier on the ground, thus the insulation became soaking wet and falls down like a horror movie.
The batting is held in place with just a straight piece of wire called Wire Insulation Stays that you bend and stick in between the joist with the bend going up.
But if the batting gets wet it doesn't matter what you do its going to fall out in chunks of wet moldy mess.
Plus the R19 turns into about R1 once wet.
Its also a mouse and varment haven.
You probably would have been better off spending the money you spent on the floor joist insulation just adding it to the wall insulation to get higher R-value foil covered polyiso rigid foam board.
But whatever you do, make sure that the Polyethylene sheeting you put on the ground is sealed everywhere so that you have less humidity up under there, if not then your batting insulation will be crap within 2 years.
Also you might wish to get a Radon test done just for the hell of it if you haven't already.
I just ordered two from our local State Radon Program so was only $10.68 for two test.
You can find them here IF your state has any.
If not then they are still only about $15 each and if you are in either Worcester, Middlesex or Essex counties then chances are good that you might have high radon levels.
http://www.epa.gov/radon/states/massachusetts.html
I am in a "Orange" zone so odds are pretty good ours might be high also, I will find out in a few weeks.
Good luck.