Need to gain attic space by placing plywood over current roll insulation. Upon checking with various companies for solution, Ive been advised my attic is poorly insulated and suggested to add 15" of fiberglass blow insulation. This does me absolutely no good as it totally eliminates the room I need to use as storage. Therefore I decided to look at closed cell foam and open cell as alternative but its dizzy'ing trying to know what is best since all companies have their pitch of why their solution is superior. Can anyone share their knowledge and/or ideas? It would be greatly appreciated! Thank you in advance!
You are only tackling the problem from one direction - the attic floor. You can insulate this to say 6" lifting the floor on extensions to the rafters. Then you can insulate the inside of the roof. This can be done with Super Foil insulation - a combination of foils and insulation 17 layers altogether. This is clean and easy to fit, and will also make the attic very light efficient too.
SOURCE: How do I know what type of insulation to use when building my home?
It seems to me that a reliable source would be this site from the Department of Energy. You just enter your zip code along with some other info and it provides recommendations for your building:
http://web.ornl.gov/~roofs/Zip/ZipHome.html
SOURCE: What are the advantages of open-cell spray foam as opposed to closed-cell spray foam?
It really depends on the type of building, but in general, open-cell spray foam make more sense economically. Don't kow how relevant it is to you, but it also allows timber to breathe. It's great as a suond barrier because they block twice as much sound as closed-cell spray foam. Oh, and they are also unlikely to harm electric wiring or plumbing parts because of their usually low exothermic temperature.
Hope I helped!
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I would most likely go to the contractor and tell him how much you want. Some places just want you to pay more and so the recommend a lot of it. This would also be really expensive because you are getting fiber glass blow insulation. http://choosefoam.com/residential/
Patty, great question regarding making room for storage in your attic. I never thought about how adding extra insulation might take up some of the space you need. Depending on where you live, you might want to look at what type of R-value you actually need. http://www.insulationwholesalers.com.au/
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