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Question DetailsAsked on 12/16/2014

What is the ballpark cost on adding insulation in an attic of a 1200 sqft house?

I bought a house built in the 70s and the insulation is pretty thin up there. I want to have someone do the blow in stuff (name escapes me) and maybe add a solar powered fan to the vent.

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1 Answer


Here are a few prior similar questions with answers - more in the Home > Insulation link in Browse Projects, at lower left, including a lot of comments on do's and don't with regard to attic insulation - the most important being to be sure penetrations and gaps from the house to the attic (including the access stair or hatch) are sealed to keep warm, moist air from getting up there, and that the insulation does not block ventilation airflow from eaves to ridge vent.

When you say "blow in stuff" shredded rigid foam, shredded metal foil, loose fiber fiberglass, and cellulose (wood fibers or shredded fire-resistant treated newspaper or old jeans) are all used - you probably meant the shredded recycled newspaper, which is multi-colored (though commonly green dyed) and looks like it would make terrific spitwads.

My recommendation - if your attic is not dry and condensation/frost free year around, think twice before using cellulose as you can get surficial mildew/mold pretty easily. However, it does have an advantage over open type insulations like fiberglass or foil - it holds water, so small leaks or heavy frost melting commonly does not make it down to the living space ceilings, though its water-retention characteristic also means that if it does get wet, the potential for rot damage to wood structure is greater because it takes a lot longer to dry out once it does get wet.

Answered 5 years ago by LCD

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