looking for a spare rib recipe with apple cider from ron hazelton?
Go with the pink stuff and don't bunch or cram itIt does best if it can be left to it's full thicknessThe facing goes against the warm side (the floor)It'll install easier than the rigid sheets that you asked about especially around odd shaped objectsIt's a nasty job to say the least but, worth the effortCoveralls, dust mask and goggles are a mustGood luck.
in my experience sprayed on foam insulation works great for your situation, but is a little priceyfor a more affordable option buy batt insulation (pink panther type) it will say on it how thick it ismeasure the distance from the underside of your floor to the bottom of the floor joistbuy the appropriate size and staple upthen cover with either the foam insulation you suggested (use button cap nails sold at local hard ware store 1 1/2 is good enough but the longer the nail the better it will hold it on due to wind under your house) or they sell a thicker foam commonly used on roofs or in cement slabs which will offer a little more insulation value (called R-value) be careful to buy the right sized insulationa lot of people are tempted to buy thicker than they need and stuff it in real tightthis actually lowers the R-value of the insulation and gives them less insulation value than the right size would havefiberglass insulation works by trapping air inside its fiberglass strandsthis air slows down the hot or cold from outside because that air has to change the temperature of the trapped air before its temperature change can creep into the houseso if you stuff it tight the fiberglass gets all mashed up leading to less trapped air and a lower barrier against outside temperaturesorry didn't mean to get discovery channel on you but i thought you should know ) or if you don't want to spend the money on the insulation boards you can just add the wire to help hold up the batts of insulationthe batts alone should help a lot, but the other would give you morejust so you know the R-value 3 1/2 thick 15-19 ( fits standard 2x4 wood thickness) 5 1/2 thick 21 (fits standard 2x6 wood thickness) 9 1/2 thick 30 (fits standard 2x10 wood thickness) 12 thick 38 (fits standard 2x12 wood thickness)
You canHowever, the insulation needs to be held in place with straps between the floor joistsYou should be able to find what you need at the local Home Depot, Lowe's, or MenardsYou may also want to put some additional insulation around the rim joistThe is the board that runs around the outside of the house and sits on top of the foundation wallA lot of air can get in through small cracksGood luck and stay cozy!
USA First, when considering insulation, consider R Value first, then type of materialIn the northern half of the country, a minimum R30 would be required at the floorIf using fiberglass with a facer, or any insulation that has a vapor barrier, place the vapor barrier up against the floorFor better results, also install a vapor barrier on the ground in the crawl spaceA heavy (10 mil thick) plastic, completely sealing the area wall to wall will do fineThe building codes all refer to R Value, no matter what type insulationHowever, any insulation is better than none at all2 thick 4' x 8' sheets of extruded (not expanded) polystyrene or, better yet, polyisocyanurate nailed to the bottom of the house with no gaps at all will help, even though the R Value is only about 10Do not listen to anybody who does not talk in terms of R Value and vapor barriers.
