What type of insulation should I use for cantilevers in my home?
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From the photo I cant tell where this is in your home. I would check your local building codes for proper insulation ratings. Can easily be found on line at your city, town, village or county websites.
This is in my basement I have cantlevers on both sides lengthwise. The foundation/basement is smaller than my ground level. This picture was taken from my basement pointed towards the cantilever in the front side of my home.
Based on what I see here, I would say that the spray foam insulation would be your best bet. It would fill the entire space including any crevices, pipes and other obstructions. Worth getting an estimate and you could discuss your options with an expert.
They make a foam sleeve to go over pipes available at the hardware or home store, if it really freezes hard there, I would get the heated tape and wrap the pipe.
https://www.youtube.com/watch?v=su7nu8WIDEw
https://www.youtube.com/watch?v=jayxTvxejKA
I don't how big this space is but you might look at the spray insulation from Home Depot.... Touch and Foam.... 200 board feet or 600 board feet.... http://www.homedepot.com/b/Search/N-5yc1vZasbs/Ntk-Extended/Ntt-spray+foam+insulation?Ntx=mode+matchpartialmax&NCNI-5
wear a paper suit and ventilation mask
And also blow-in insulation from Home Depot and you can rent a machine to blow it in yourself if its the space under the floors ... http://www.homedepot.com/p/GreenFiber-All-Borate-Cellulose-Blow-in-Insulation-30-lbs-36-Pallet-INS765LD/300584221
So the front and back of the house extends over the foundation. The pipe in the photo appears to have the insulation sleeve on it. If not get some. Seems it would be hard to get spray foam in there due to the depth of the cavities. I would go with the blown in insulation as Sharon suggests. I know that Home Depot will loan the blower free with the purchase of so many bags of insulation. All you need is to measure the square footage of the spaces. Allow at least 10% more. Run the hose as far in the cavities as it will go and slowly pull it out as you fill them. This will pack the insulation more tightly for a better insulating factor. Once you get the insulation in the cavities you can seal the opening with the foam board. Wear eye protection, gloves, and dust mask.