Attic Insulation

Winterizing – Attic Insulation

Here’s a unique thought about Attic Insulation.

There are many types of insulation to use up in the attic.  The most common is the Pink Fiberglass that has been around for decades.  Then came Cellulose, both of these we have talked about in the past.  Both have advantages and disadvantages.  If the truth were known our favorite is Cellulose because it does such a good job and is the most cost effective. 

Did you know that if the Pink Fiberglass is compressed or squished it loses much of its insulating value?  If you squeeze the fiberglass its R-Value goes down.  So, if you decide to add Cellulose on top of existing fiberglass be careful when you do your calculations.  Fiberglass is best when it is “fluffed up” and not so good when it is squeezed into a space or when Cellulose is put on top of it.

When the attic insulation is all done it needs to be level, not have bumps, humps, highs, and lows.  Sound silly?  Well, insulation in the low spots is an area where heat will escape more quickly.  If you have 16” of Cellulose and over in the corner there’s a spot where it is only 14” thick then that spot will have a 10% increase in heat loss.  That may not sound like much but when the surface of the attic insulation is bumpy there are many spots where the insulation is 10% or 20% less effective.  Add all those spots together and it becomes significant.

If you were to ask for the TWO most significant things you can do to improve the Energy Efficiency of your home they would be:

  1. Stop the Cold Air Penetration in the basement – very important!
  2. Make sure the attic insulation is level and smooth, get rid of the ups and downs – very important.

Those two simple things will make a huge difference in the Energy Performance of your home.

How easy is that!

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