Cellulose vs. Fiberglass

Opinions vary constantly as to which is better, cellulose or fiberglass.  But it is important to get the facts straight about each.  Both are excellent insulators and when used correctly can extend the durability and comfort of your home for years.  Each can be used in flat attic spaces and in wall cavities.  In the end, the decision as to the product you choose is yours to make and we at Beldner’s Insulation have the experience and skill to make sure it gets done right.

Fiberglass comes in both the common batt form and the loose fill blown form.  Loose fill fiberglass insulation is blown in and is very light weight.  This light weight aspect of the insulation can extend the life of the product by minimizing the settlement of the product over time.  The same blown in insulation can be dense packed into walls to give excellent coverage and ensure the full fill of each cavity.  This BIB system of insulation is the highest value of fiberglass insulation that you can get into a wall.  A fiberglass batt, on the other hand, does the same job insulating the wall but has the possibility of leaving small gaps around the exterior of the batts.  We, as insulators, are constantly working to minimize this effect but it is a constant battle right up to the point that the dry wall is put in place.  Fiberglass batts are also the most cost effective way to insulate underneath the floor boards of crawl spaces.  By using simple metal hangers, a fiberglass batt can be placed in the floor cavities and insulate for years to come.

Cellulose insulation is recycled paper that is chemically treated to be fire resistant, mold deterrent, a pest deterrent as well as an excellent sound barrier.  Cellulose insulation comes in only the loose fill form, but has many uses.  Cellulose insulation is significantly denser than fiberglass which gives it a better R-value per inch than fiberglass, meaning that in cases where there is a low pitch roof line and there is little space to fit insulation to maximize the insulation level with blow-in insulation, cellulose will be the better choice.  The density of the cellulose also makes the product heavier allowing it to be a great way to retrofit an attic that already has fiberglass insulation in it.  The weight can actually compact and increase the R-value of the fiberglass while not only adding it own R-value but reducing the amount of air that can settle into the product in extreme temperature days.  The additional weight does have a disadvantage as the product does have a settlement factor, a factor that is known by the manufacturers and is accounted for when blowing insulation by adding more insulation than is called for allowing the product to settle to its determined level.  In wall cavities the insulation can be sprayed with water to hold it in place, preventing the settlement and making it a stable product that gives excellent coverage and can be an excellent sound barrier.

We at Beldner’s Insulation carry both products and are well versed in their application.  In the weatherization field, the correct application means everything and we stand by our services with our one year guarantee.  We would be happy to meet with you to help you choose the product that works best for your individual situation.  Please give us a call at (314) 428-6095 or visit our website’s homepage to request a consultation.

Leave a Reply

Your email address will not be published. Required fields are marked *