What is R12 insulation used for?

Description. This Johns Manville insulation was created for walls and attics to improve energy and acoustic efficiency. You will appreciate the flexible material made of fibreglass without formaldehyde and resistant to fire and mildew.

What is a good r number for insulation?

between 6.1 and 7 Currently, the recommended R value for attic insulation is between 6.1 and 7, a combination of thickness and conductivity.

Is R12 insulation good for garage?

Most garage-door insulation has an R-value of between R-8 and R-12, because it is so thin to fit the space. This adds insulation to the garage door without impeding its functionality. … Insulating the garage without insulating the garage door allows any heat in the room to escape through the door.

What is the R-value of 12 inch insulation?

Typically, the thickness and density of the material determine the R-value. The higher the R-value, the better the material will insulate. The number is presented per inch, so an R-value of 3.1 at 12 inches would provide an overall value of R-38.

What is the best R-value for 2×4 walls?

R-13 Insulation for 2×4 Walls

In most wall applications, you will use R-13 or R-15 kraft-faced fiberglass insulation rolls for these two-by-four stud walls. While rated differently, these two types of insulation are close enough in thickness that they can both fit into modern two-by-four wall systems.

What R-value do I need for attic?

R-38 R-Value is a measure of insulation’s ability to resist heat flow. The higher the R-Value, the better the thermal performance of the insulation. The recommended level for most attics is to insulate to R-38 or about 10 to 14 inches, depending on insulation type.

What is the R-value of 2-inch Styrofoam?

A wall utilizing STYROFOAM T-MASS Technology with a 2-inch exterior layer and a 4-inch interior layer of concrete along with a 2-inch layer of STYROFOAM extruded polystyrene insulation would result in a material R-value of approximately 11.33.

What is the R-value of pink insulation?

R-22.50 EcoTouch PINK FIBERGLAS Insulation R-22.5

Product	R-Value	Thickness
Close Product Details Edge: Facing:	RSI: 3.96R-22.50	152.0 mm 6.0 in.

How many inches of blown insulation is R30?

Fiberglass Chart

R-Value	Thickness	Bags / 1000 Sq Ft
R44	14.75”	20.1
R38	12.75”	16.8
R30	10.25”	13.0
R19	6.75”	8.1

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 is the best R-value for walls?

Typical recommendations for exterior walls are R-13 to R-23, while R-30, R-38 and R-49 are common for ceilings and attic spaces. See the Department of Energy’s (DOE) ranges for recommended levels of insulation below.

What is the difference between pink and blue foam board?

Both are manufactured using the same process and contain similar chemical components. The two products also have the same insulating power. However, blue foam boards are manufactured by Dow Chemical Co. whereas the pink foam boards are manufactured by Owens Corning company.

Does foam board need a vapor barrier?

Foam insulation usually does not require a vapor barrier. For some foam insulation types, such as closed-cell spray foam and foam board insulation, the insulation itself stops the movement of most water vapor.

Does stacking insulation increase R-value?

DIY Frequently Asked Questions / Can I stack insulation to get a higher R-value? Yes. For example, two R-19 batts can be stacked on each other to create R-38 insulation. You also can add loose-fill insulation on top of a bottom layer of batts.

Do you need Vapour barrier with rigid foam?

Rigid foam insulation is usually a qualified vapor barrier. However, an installation between the studs can pose a challenge. To complete the vapor barrier you would want to foam-seal or tape all the sides where the rigid meets timber, because these gaps will facilitate vapor flow.

Do you tape foam board insulation?

Best Practices for Taping Rigid Foam Sheathing

When rigid foam is used as the weather-resistive barrier and/or the air barrier, tape all seams using manufacturer-recommended tape per the manufacturer’s instructions.

Can you put rigid foam insulation between studs?

Even with its flaws—namely, its inability to perfectly mold to the bays between the studs—rigid foam insulation will be a better chance than no insulation. Using low-expanding spray foam sealant to seal those gaps further increases rigid foam’s insulating properties between studs.

Can you use foam board instead of plywood?

Some builders use two layers of sheathing — plywood or OSB for structural support and a seam-staggered layer of rigid foam for insulation. … A cost-effective way to increase the R-value of exterior walls, while also providing moisture control, is to use insulated foam sheathing instead of wood sheathing.

How do you seal the edges of foam board?

Can you paint over rigid insulation?

Only water-based acrylic or latex paint should be used on foam insulation, whether you are using the material for crafts or are painting unfinished walls. Avoid any oil-based or other solvent-based paints, these contain chemicals that damage foam. … A wax sealant can then be applied to protect the paint.

What kind of tape do you use on foam board?

HomeSealR TapeHomeSealR Tape is used to tape the joints of FOAMULAR extruded polystyrene (XPS) board in residential vertical wall applications when it is used as continuous insulation over steel or wood wall framing.

Can I use Mod Podge on foam board?

Wondering if you can Mod Podge on Styrofoam? The answer is yes, you can!

Can I use Modge podge on foam?

Tip 1: You can use Mod Podge with any foam brush or flat paintbrush, but for a super smooth application, we recommend you use foam. … Tip 3: When using your Mod Podge as a sealant and finish, be sure to cover the entire surface of your chosen project using thin, even strokes.