What does R30 mean insulation?

What does R30 mean insulation?

A wall is R-19, a roof is R-30 — what does this mean? Essentially R-value is a measure of thermal resistance, or the ability to prevent the transfer of heat. The larger the number, the harder that insulation is working at preventing heat conduction. The less heat loss, the lower your energy bills.

How much is a bundle of R30 insulation?

Compare Similar Fiberglass Insulation

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R-30 Kraft Faced Fiberglass Insulation Batt 16 in. x 48 in. R-30 Unfaced Fiberglass Insulation Batt 16 in. x 48 in.
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Insulation R-Value R30 R30

What is a good R-value for ceilings?

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.

How many square feet are in a bag of R30 insulation?


Cover Area Per Bag (sq. ft.) 469.36 ft² 58.67 ft²
Product Length (ft.) 4 ft 9.5 in
Product Width (in.) 16 in

Can you over-insulate a house?

It is possible to over-insulate your house so much that it can’t breathe. The whole point of home insulation is to tightly seal your home’s interior. But if it becomes too tightly sealed with too many layers of insulation, moisture can get trapped inside those layers. That’s when mold starts to grow.

How do I calculate how much insulation I need?

To determine the amount of insulation needed, start by measuring the height and length of each of your room walls. Multiply the wall’s length by the wall’s height and don’t forget to write down the spacing of the studs so you can then determine what type of the insulation will be purchased.

How many square feet is a roll of r30 insulation?


Cover Area Per Bag (sq. ft.) 47.92 ft² 47.92 ft²
Product Length (ft.) 25 ft 9 in
Product Width (in.) 23 in

What is better blown-in insulation or rolls?

The Differences Between Blown-in and Rolled Insulation In terms of R-value, they tend to be equal, although you can choose rolled insulation with varying R-values depending on your needs and your budget. The lower the R-value is, the less effective it will be as insulation – although it will be cheaper as well.

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

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 is better R19 or R30 insulation?

What is better R19 or R30 insulation? Inside your home, the warmer air is higher pressure air, and wants to move, or transfer to lower pressure, cooler air outside. Insulation in your walls and ceilings slows down this heat transfer. So R19 is better insulation than R13, and R30 is better than R19.

How many inches of insulation is R30?

Typical R-30 fiberglass insulation is 10-inches-thick. Click to see full answer. Then, how many inches of insulation is r30? In temperate coastal areas such as Zone 3, attic insulation of at least R30 up to a maximum of R60 is recommended. For loose-fill cellulose, this translates to a total depth ranging from 8 inches up to 16 inches.

How thick is R30 blown insulation?

– Fibreglass Insulation. – Spray Foam Insulation. – Foam Board Insulation (Rigid foam insulation) Foam boards are typically rigid sheets of polystyrene or polyurethane and are used as insulation for buildings. – Fiberglass Blow-in Insulation. – Rock Wool Blown-in Insulation. – Rock Wool Batt Insulation.

What is the thickness of R30 rigid insulation?

What Is the Thickness of R30 Rigid Insulation? The thickness of R-30 insulation varies, depending on the type of insulation used. Fiberglass panels and rolls with an R-30 insulation value have a typical thickness of eight to nine and a half inches.