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Question DetailsAsked on 6/7/2015

What is the best insulation to add to my existing attic insulation

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1 Answer


As a old energy conservation weatherizer my favorite was always ground up paper aka cellulose insulation. It has a high R value is immune to most damage except roof leaks and if you over insulate to allow for eventual settling has a huge hidden benefit- It retards air leakage from the home below. Another plus is most big box stores will loan you a blower to install it and a reasonably fit individual can install it themselves with a helper to tear bags on the ground.

In a perfect world you will

1)Seal any leaks from the home below, ie electrical wires, around heat ducts, above can lights, above pocket doors,, This is called Air Sealing and call help the insulation work by

A)Keeping excess moisture out of the insulation &

B)Keeping the conditioned air inside the home. A sealant the stays flexible is best , like accustical caulk and your good ol triple expanding foam can fill cavities around chimney chases etc.

2)Use a plastic rake to pull back the existing insulation

3)Make sure there are chutes around any soffit vents to maintain attic ventilation.

Note air must be drawn threw the attic to allow moisture to escape especially in the winter, wet insulation does not have a high R value.

Check with you local utility company for the reccomended R value and allow for cellulose insulation settling.

If not able to crawl around the attic, use Angie's List to secure a reputable insulation contractor.

Jim Casper Old House Doctor

current gutter cover contractor

ps for ideas on gutters and covers see my website


Answered 4 years ago by jccasper

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