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Spray Foam R-Value is Your Advantage

We have heard for many years about R-value. You may be asking yourself this question,
What is R-Value?The insulations ability to retard heat flow is known as its R-value. The revalue stand for thermal resistance.The R-value of any building is determined by the  combination of insulation and other building materials. We all have seen as we were installing the fiberglass insulation in our buildings the R-value that was sated in the insulation batts.

Here at the Green Energy DR we will take a look at various insulations and building materials and see how much more of an
insulation advantage spray foam insulation will bring us.

There are several types of insulations that are installed in our attics and on our
construction jobs. Fiberglass is the most common. This type of insulation is installed rather
easily by stapling to the studs and ceiling joists in your structure. The first blown in insulation
that became available to us available is known as cellulose. Cellulose consist of crushed
newspaper mixed with fiberglass.  The latest method of insulation that has been introduced to us
is spray foam insulation. This spray foam is known as spray polyurethane foam (SPF). SPF is
available to us in what is known as open-cell and closed-cell.  We will compare the R-value of each type of insulation and you will see the advantage that SPF will give us when it come to R-value.

FiberglassSpray Foam on The Roof of a Metal building

Fiberglass insulation is probably the most common insulation to all of us. Fiberglass
insulation carries an R-value of around 2.6 to 3.0 per inch. In a typical wall of 3 ½” which is
most common in residential construction you would have an R-value of around 11. If you have 6” walls it will increase to around 19. One of the problems that we are facing with fiberglass
insulation is the lack of air sealing in our walls and attics.

Cellulose Insulation
This is the first type of blown in insulation that became available to us. This cellulose
made it easy for us to blow in additional insulation in our attics. It help us to increase R-value but
air sealing still was a challenge. Cellulose carries an R-value of 3.6 per inch. With a typical 6”
installation in our attics we would have an R-value of 21. Our walls would be at 11. Cellulose is
a good air sealer but is not the best option when it comes to air sealing.
Spray Polyurethane Foam (SPF)
This is the newest method available to us today. This foam is available to us in open-cell
or closed-cell. When it comes to R-value SPF is the top performer. Closed-cell foam will give
you the higher R-value off the two at 6.0 to 7.0 per inch. In a typical 3 ½” wall you will have an
R-value of around 20 and in a 6” installation you will have almost 40. Closed-cell is also more
dense and rigid to help you gain structural integrity. Open-cell foam has an R-value off 3.9 per
inch giving you an R-value of around 14 in a typical 3 ½” installation. It is less dense than
Closed-cell and is not as rigid. The increased R-value is not the only advantage that SPF will
bring you it is the best you can use when it comes to air sealing your attics and walls.
As you can see spray foam insulation will provide you with more benefits when it comes
to cutting energy coast and saving money. It may be more expensive but the advantage you
receive are well worth what you will invest. Consult with your local spry foam contractor to see
for yourself the advantages available to you.


One Comment

  • taewc2 November 21, 2009 at 1:52 am

    great product with huge results!

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