Insulating an old house is a huge challenge. There are many variables that complicate the process of adding insulation into previously empty wall cavities. Before taking this project on, do your research! The time spent on examining all the pros and cons of insulating an old house can make a dramatic impact on the longevity of the house. All the big box stores sell a wide variety of insulation. You can also find it on Amazon:

JOHNS MANVILLE INTL 90013166 Series R13 15"x32' Kraft Roll
by JOHNS MANVILLE INTL
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Owens Corning R-13 Faced Insulation Roll
by Owens Corning
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Frost King CF1 "No Itch" Natural Cotton Multi-Purpose Insulation, 16 x 1 x 48-Inch
by Frost King
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Pink Insulation Foam 1/2" Thick (4 sq ft)
by Owens Corning
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Insulation can come in many forms and thicknesses. Typical insulation is fiberglass and cellulose. There are also foam insulation boards (polyethylene) and even batts of insulation made out of old jean denim if you want to avoid the annoying itch of fiberglass insulation installation.
Insulation comes in various widths as well - r-13, r-19 etc. Some insulation is faced ( has a paper or foil side to it). Some is un-faced.
Adding the right insulation in the right way is key to a well don job. It is not simple. Rather it is quite complicated if you want to add insulation without causing damage to the old house which never had wall insulation when it was built.
The insulation in the wall cavities must always stay dry!
Our choice was to add house wrap to the exterior and reside the house. Along with doing that, we are installing all new windows and doors being sure to properly flash all the openings. This way we can make sure the the newly insulated wall cavities will stay dry. Dry insulation means a long life for the house walls.

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