Best Attic Insulation Method

Insulating your attic should be a top priority especially during the bitterly cold winter months. And before arriving at a decision about what insulating material to use, it is wiser to acquaint yourself with the options you have at your disposal.


The following are the 3 conventional ways you can insulate your attic –

  1.  Batts (Fiberglass/Cotton) – These are large chunks of insulating material which are composed of long, intersecting fibers bound together by adhesives. Fiberglass and cotton are used for batt insulation. However, there’s a drawback to using these materials because cotton and fiberglass leave empty spaces without insulation because of their resistance to shape alterations.
  2. Blown (fiberglass/cellulose) – In this case the insulating material is blown in smaller chunks through a hosepipe and this is a better option than batt insulation. But without the help of trained professionals you won’t be able to install the material. Aside from thi,s loose-fill installations tend to have a lowered thermal resistance (R-value) over time and absorb moisture which is definitely bad for your attic.
  3. Spray foam – Spray foaming is widely regarded as the best way to insulate your attic. There are two types of spray foam which are used for this purpose , open cell and closed cell. While the open cell spray foam has an R-value of about 3.5 per inch the closed cell one has an R-value of about 7 per inch. When installed perfectly, both types of spray foam will prevent air from seeping in although open cell foam does not act as a vapor barrier like closed cell foam. Spray foam seals off all attic bypasses of air currents. It is also known to eliminate heat conduction through convection as air cannot find free passage through the foam. There’s one teeny downside to using spray foam which is its high cost and the mandatory requirement of professional contractors during insulation. But given its high R-value and general effectivity against invasion of dust, pollen, water vapor, and air spray foam is the best choice when it comes to insulating your attic. And in addition to this, spray foam insulation allows you to move the boundary between the conditioned and unconditioned space from the attic floor to the attic roof. Spraying foam can save you the hassle of renovating your house design and system by helping bring the ducts inside the envelope. The best cost effective method of spray foaming the attic is to foam the surface of the roof on the underside and use loose fill insulation on the top.

Thus it is obvious that despite its higher expenses, spray foaming is the most preferable method of insulating your attic.