Receiving Helpdesk

what r value insulation do i need for ceiling

by Dr. Leslie O'Kon III Published 3 years ago Updated 2 years ago

Zone 5

Good Better Best
Ceiling Below Attics R-40 Batt or Blown Insulation R-50 Batt or Blown Insulation R-60 Batt or Blown Insulation
Cathedral Ceilings & Flat Roofs R-31 Batt Insulation R-31 Batt Insulation + R-5 CodeBord ® R-31 Batt Insulation + R-10 CodeBord ®
Floors Over Unheated Spaces R-31 Batt Insulation R-31 Batt Insulation + R-5 CodeBord ® R-31 Batt Insulation + R-10 CodeBord ®
Walls Above Grade R-19 Batt Insulation + R-5 CodeBord ® R-19 Batt Insulation + R-7.5 CodeBord ® R-24 Batt Insulation + R-10 CodeBord ®
Apr 23 2022

Depending on where you live and the part of your home you're insulating (walls, crawlspace, attic, etc.), you'll need a different R-Value. 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.

Full Answer

How do you determine the are value of insulation?

Insulation types with the highest R-value

  • Closed-cell spray foam R-value: 6.5 per inch
  • Mineral wool R-value: 4-5 per inch
  • Cotton batts R-value: 3.5-4 per inch
  • Open-cell spray foam R-value: 3.5 per inch
  • Fiberglass batts and blankets R-value: 3.0-4.0 per inch

What is the are rating for ceiling insulation?

R-Value is the measurement of insulation’s ability to resist heat flow. R-Value ranges from 1.5 to 7 and the higher the insulation’s R-Value, the better that product is at insulating your home. There are three types of R-Value to be mindful of: ‘Up’ R-Value: Measures insulation’s resistance to heat flow out of the house.

How to put insulation in a ceiling before drywall?

Tips For Installing Insulation in Walls

  • Never compress the insulation. ...
  • If a roll or batt is too long for a space, it must be trimmed and never folded over itself for optimum performance.
  • When finished, launder your work clothes in a load separate from your regular wash and run the rinse cycle twice.

What is a good your value for basement insulation?

What Is A Good R Value for Basement Insulation?

  • Increasing R-Value by Maximizing Insulation’s Effectiveness. While many homeowners will buy products that claim to offer R-values of R-15 or higher, much of this incredible efficiency is lost due to ...
  • Choosing the Right InSoFast Panel. InSoFast panels come in either 2 or 2.5 inches of thickness. ...
  • Effective and Fast Installation. ...

What insulation should I use in my ceiling?

Ventilated ceilings near the rooftop can do well with fiberglass batts and rigid foam, whereas unventilated ceilings may provide better insulation with spray foam. Flat ceilings also often do better with other insulation options, such as blown-in cellulose.

Is R-30 insulation for ceilings?

R-values measure the resistance to heat flow across a material. For ceilings, R-30 insulation is the recommended minimum.

Is R 13 Good for ceilings?

R13 batt insulation is typically used to attenuate sound in interior wall cavities. It is akin to a large blanket, designed specifically to fill a wall, floor, or ceiling cavity.

What insulation do I use for 2x6 ceiling?

Use R-19 or R-21 kraft-faced fiberglass insulation for two-by-six (2x6) walls. This combination ensures that the insulation is neither too loose nor too tightly packed within the walls.

How thick should my ceiling insulation be?

The recommended level for most attics is to insulate to R-38 or about 10 to 14 inches, depending on insulation type.

Which is better R19 or R30 insulation?

The bigger the R value, the better the insulation is at slowing down the heat transfer. So R19 is better insulation than R13, and R30 is better than R19. The larger the R value, the better the insulation value.

What is the difference between R-13 and r19 insulation?

Although the U.S. Department of Energy rates R-13 insulation as "good" for use in walls in southern areas of the country, it rates R-19 insulation higher, designating it as "great." That is because R-19 insulation provides more thermal insulation than R-13 does.

Is r19 enough for garage ceiling?

If my garage ceiling wasn't insulated, all that heat would rise to my bedroom and my AC bill would be much higher. R-19 insulation is suitable for floors/ceilings in most homes, unless it's the highest ceiling in a house.

What is R15 insulation used for?

R-15 EcoTouch® insulation is intended to be friction-fit between exterior wall wood studs. Standard R-11 batts require the use of thick foam sheathing to achieve the recommended R-19 thermal performance.

Can you put R30 insulation in 2x6 ceiling?

If you choose to use the 2x6 roof joists, you'll only be able to "fill" the joist space up about 4.5". So, your choices are 3 1/2" thick batt insulation for an R-value of about R-11.9 or rigid insulation board for a R-20 to R-30, depending on the type of board.

Does ceiling insulation need a vapor barrier?

Vapor Blockers Vapor barriers—sheets of plastic or kraft paper—keep water vapor out of the wall cavity, so the insulation stays dry. Not every type of insulation needs a vapor barrier. But if it does, the barrier should face inside in northern, heating climates, and outside in humid southern climates.

How thick is R30 insulation?

8¼ ” thick8¼ ” thick, R-30C EcoTouch® Thermal Batt insulation prevents moisture damage and helps assure long roof life by providing 1" of ventilation air space between the insulation and roof deck. Easy Installation R-30C EcoTouch® Thermal Batt insulation is easy to handle and install.

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