Quick Answer: Which Is Better Foam Board Or Fiberglass Insulation?

Which type of wall insulation is best?

Closed cell foam has the highest R-value of any insulation, around R-6.2 per inch, but can be expensive; open-cell foam insulation values are around R-3.7 per inch of thickness..

Is spray in foam insulation worth it?

The EPA’s Energy Star Association has shown that monthly energy bills can be cut by up to 20% when air leaks are sealed and efficient insulation is installed. The initial cost of spray foam insulation is well worth the investment, when factoring in the overall savings that will be headed your way over the long term.

Can mold grow on spray foam insulation?

As a product, spray foam insulation does not attract mold. And unlike wood or metal, spray foam does not rot, rust or deteriorate. … Clearly, spray foam insulation does much more than just insulate. It will control indoor humidity and condensation, and therefore prevent mold from growing and spreading.

Does rigid foam insulation need to be covered?

Rigid foam insulation, whether it is expanded or extruded polystyrene, does have to be covered if it is installed in the interior of a building. … Because this type of insulation is made from plastic, it is combustible and may give off highly toxic fumes when burning.

Can you put fiberglass insulation over foam board?

insert foam board between the studs to seal everything up tight, and then install fiberglass batts over the foam board. Finish with plastic stapled to the studs, then drywall.

What are the disadvantages of spray foam insulation?

Below we are going to list the most common problems with using spray foam insulation in your home’s attic or in any area inside of your home.Placement Errors During Installation. … Potentially Attracts Water Damage. … The Material May Shrink Overtime. … Long Dry and Cure Time.

Can mice eat through spray foam insulation?

But they can also contaminate the environment, and be quite destructive. Mice have been known to chew through electrical wires, fiberglass insulation batts, and rigid foam insulation. … Generally, mice have no attraction to spray foam insulation, as it doesn’t represent a food source.

What is better foam or fiberglass insulation?

Fiberglass insulation is significantly cheaper than spray foam insulation, but it is also less effective, especially in extremely cold conditions. … Professional installation is required for spray foam insulation, but fiberglass insulation can often be installed by homeowners themselves.

How dangerous is insulation?

There is no evidence currently of long-term damage from inhaling fiberglass particles, and workers who come into regular contact with fiberglass insulation are not considered to be at any higher risk of lung and breathing problems, especially if they wear proper safety attire.

What is the best material for attic insulation?

Loose-fill fiberglass attic insulation still experiences convection, but not nearly as much as old fiberglass used to. If you check with the North American Insulation Manufacturers Association, they’ll assure you that fiberglass or mineral wool is definitely your best choice for attic insulation.

What are the pros and cons of spray foam insulation?

List of the Cons of Spray Foam InsulationSpray foam insulation does not always fill every possible cavity. … Spray foam insulation might encourage water damage for some homeowners. … Spray foam insulation can sometimes shrink. … Spray foam insulation requires a lot of experience to get it right.More items…•

How thick should foam board insulation be?

Foam board insulation is easy to use and is a great DIY way to add some insulation. It comes in standard-size 4×8 sheets, and smaller sizes, in many different thicknesses from 1/4 inch to 2 inches. Some types of thicker foam board insulation are available, but they may need to be special ordered.

Which type of insulation is most effective?

Aerogel is more expensive, but definitely the best type of insulation. Fiberglass is cheap, but requires careful handling. Mineral wool is effective, but not fire resistant. Cellulose is fire resistant, eco-friendly, and effective, but hard to apply.

What are the dangers of spray foam insulation?

According to the EPA, “homeowners who are exposed to isocyanates and other spray foam chemicals in vapors, aerosols, and dust during or after the installation process “run the risk of developing asthma, sensitization, lung damage, other respiratory and breathing problems, and skin and eye irritation.”

What material has the highest R value?

Vacuum insulated panels have the highest R-value, approximately R-45 (in U.S. units) per inch; aerogel has the next highest R-value (about R-10 to R-30 per inch), followed by polyurethane (PUR) and phenolic foam insulations with R-7 per inch.

Where should you not use spray foam insulation?

When NOT to Use Spray Foam InsulationFor areas that are too close to electrical boxes:For areas too close to ceiling light boxes:Open-cell spray foam on your roof:For closed-cavity spaces:If you have a history of skin, respiratory, or asthma problems:

What is the best insulation for the attic?

Fiberglass, cotton, and mineral wool can all work as loose-fill material, but the far and away top choice for blown-in insulation is cellulose.

Do you need a vapor barrier with foam board insulation?

Rigid foam insulation is it’s own vapour barrier in this application, so you don’t need to use the poly. Just make sure you tuck tape all the joints. … Yes, you can go right over your existing blown in insulation with batt insulation, just make sure you butt the batts up tight against one another so there are no gaps.