Does insulating a crawlspace with Reflectix really work and how do you do it?

Question

There is a lack of information on this topic. I've read the manufacturers website but I would like to hear it from the consumers.

Answer 1

Reflectix offers an R value of 16.8. This is o.k. if you are simply adding it to some old batting type insulation in your crawl space. If this is your sole insulation you have a problem. The International Building Code, which covers all the the U.S., requires an R value of a minimum of R-19. Most green construction sources will tell you that insulating to the bare minimum just to meet the code is going to cost you enormously on your energy bill. The recommendation is to exceed the minimum requirements by 40 to 60%.

If you have no other insulation, consider spray foam insulation. This type of rigid insulation offers an R value of 7 for every inch of the stuff that you apply. You can even make it a DIY project by checking out Tiger Foam on the web, they will sell you the stuff ready to install. Good luck!

Answer 2

Reflectix sounds more like a UV shield to cut down on heat penetration?????
Crawlspaces dont get sun, so i would recomend depending on the size of your floor joist to use batten type insulation and inslall a chicken wire or other barrier to keep out the rodent, cat and dog pest.

Answer 3

any type of insulation in a non-insulated crawl space will reduce energy costs. A plastic vapor barrier on the dirt will also help.