Home Improvement

How deep is r60 blown insulation?

R60 Required Thickness of Insulation Materials

Insulation Material Thickness Required for R60
Fiberglass (Batts) 20-26 inches
Fiberglass (Loose-fill) 16-20 inches
Spray foam (Closed-cell) 6-10 inches
Spray foam (Open-cell) 10-14 inches

What is the thickness of R60 blown in insulation?

R 60: Thickness that oscillates between 19 and 22 inches.

How many inches of fiberglass insulation is R60?

The average recommended level is 17 inches of R60. In Zone 4, the average minimum requirement for attic insulation is 11 inches of R38 fill. The average recommended level is 17 inches of R60. How much insulation in attic for Zones 5-7?

How thick is r50 blown insulation?

While conventional insulation requires a thickness of 15 inches to reach an R-value of 50, Rich-E-Board achieves the same result at just 1.5 inches thick.

Is R60 too much?

Recommended R-Value Varies by State



You need exactly as much as the area you live in determines. Here, where temps get pretty hot for much of the year, attics should have from R30 to R60 (average is R38). Those living up north want anything from R49 to R60. This helps insulate against the extreme cold weather.

What does R60 insulation mean?

On average, the higher the R-value, the more resistant the material, so if you have a material that’s rated R60, it will be more resistant to heat than a material that’s rated R30.

What depth should insulation be in attic?

As a general rule of thumb, you need to reach an insulation R-value of R-38, and add between 10 and 14 inches of insulation. But the attic insulation thickness depends on the material you use. Some offer higher R-value, meaning you need less insulation to achieve the desired effect.

Can you put too much insulation in your attic?

It’s possible to over-insulate an attic as too much will cause moisture buildup and eventually result in mold. Eventually, adding more insulation leads to diminishing returns in trapping heat as well.

How much insulation do I need for R 60?

If you have approximately 6″ of existing insulation, you’ll need to add an additional 17″ to reach R-60. If you have approximately 10″ of existing insulation, you’ll need to add an additional 13″ to reach R-60. If you have no insulation, you’ll need 23″ to reach R-60. 3 Determine how many packages to purchase.

How many inches of blown in cellulose insulation do I need?

Cellulose holds an R-value of 3.7 per inch. Insulating an attic will require 9-14 inches of thickness. Lastly, mineral wool will generally hold an R-value of 3.3 per inch. To insulate an attic, you’ll need 9-15 inches of thickness.

What is the R-value of 12 inches of blown insulation?

Blown fiberglass installed in the attic has an R-value of 2.2 per inch, so 12 inches of it would give you an R-value of 26.4 in your attic installation project.

What is the R-value of 14 inches of blown insulation?

Cold Climates (R-49 to R-60):



Fiberglass (batts): 14” – 19” Cellulose (blown): 14” – 18” Rock Wool (loose): 17” – 25”

How much insulation do I need for 1000 square feet?

For example, if the square footage of the room you’re planning on insulating is 1,000 square feet and you want to achieve an R-value of 60, you will need approximately 17 bags to fully insulate your room.

What is the R value of 14 inches of blown insulation?

Cold Climates (R-49 to R-60):



Fiberglass (batts): 14” – 19” Cellulose (blown): 14” – 18” Rock Wool (loose): 17” – 25”

How many inches of insulation is R49?

R49 Insulation Thickness Guide

Insulation Material R49 Thickness Required (Inch)
Closed Cell Spray-Foam 7 to 8 inches
Fiberglass Batt 14 inches
Blown-In Fiberglass 16.25 inches
Blown-In Rockwool 16 inches

How thick is r38 insulation?

The R-38 high-performance batts are 10˝ to 10-1/4˝ thick as opposed to stan- dard R-38 fiber glass insulation batts of 12˝.

How thick is r30 insulation?

Typical R-30 fiberglass insulation is 10-inches-thick. Prior to buying fiberglass insulation, it is important to measure the joint spacing you are working with.

How many inches is R30?

Fiberglass Chart

R-Value Thickness Bags / 1000 Sq Ft
R49 16.25” 22.6
R44 14.75” 20.1
R38 12.75” 16.8
R30 10.25” 13.0

What is the R-value of 2 inches of closed cell foam?

The R-value of closed-cell foam is R-6.5-7 per inch. Contractors often use it to insulate under slabs, ceilings, walls, and roofs.

Can you compress blown in insulation?

You don’t need to worry about removing some of the insulation so you can do it without compression. Just put the whole piece back there and let it be compressed. So, compress if you need to and don’t worry about it. Just make sure the space is completely filled.

Can you put too much insulation in your attic?

It’s possible to over-insulate an attic as too much will cause moisture buildup and eventually result in mold. Eventually, adding more insulation leads to diminishing returns in trapping heat as well.

What is the highest R-value for a 2×6 wall?

Thermal Control



The installed insulation R-value for 2×6 fiberglass batt ranges between R-19 and R-21. When blown or sprayed cellulose insulation is used, the R-value is typically R-20 for 2×6 walls.

Is it OK to put plywood in the attic?

An attic can be floored with 1/2″ CDX plywood, if it is being used only for storage. However, the same can’t be said if you are planning on using the space as a living space. In that case, you will need to use 3/4″ thick plywood. As an alternative, 3/4” OSB can be used.

How much weight can I store in my attic?

On average, an attic that has not been designed specifically for storage or already converted into a habitable room can hold 10lbs per square foot. The maximum weight load of an attic can be increased by taking certain measures, such as layering wood across the joists to spread the weight.

How thick should attic floor be?

The thickness that builders use most often for subfloors is 3/4 inch, and when they need extra reinforcement, they use 1-inch material.

Can I walk around in my attic?

You could step on that and if you do that you're you could fall all the way through or you could just crack the sheetrock.

What should you not put in the attic?

10 Items You Should Never Store In The Attic

  • Paints, cleaning products, or other toxins. …
  • Anything that is highly flammable. …
  • Delicate holiday decorations. …
  • Art is never good to store in the attic. …
  • Leather products. …
  • Cardboard boxes. …
  • Musical instruments. …
  • Anything wool (or made from natural fibers)

How often should you check your attic?

once every 3 to 6 months

Checking Your Attic



As a general rule, it’s a good idea to check your attic once every 3 to 6 months. There are numerous reasons why checking your attic regularly is important, notably it’s the first place leaks will show themselves. If a leak occurs, there will be signs of it in your attic before anywhere else.

Can attic joists support a floor?

That begs the question; can my attic support a floor? The answer, in most cases, is a definite yes. Even though it wasn’t put there, the joists supporting your ceiling are quite strong. Putting down flooring won’t stress them any more than the floors in your bedroom, kitchen, or bath.

Is OSB OK for attic floor?

If your attic joists won’t bear the weight necessary to finish out a living space but the engineer cleared them to support floor decking for light storage, you can install ½-inch plywood or oriented strand board (OSB) in 4-foot-by-8-foot panels over existing 16-inch OC joists.

How do I strengthen my attic joists?

How to Reinforce an Attic Floor with Sister Joists

  1. Clear the Joist Spaces. Pull out all insulation and any debris from all of the joist spaces so you can see the full length of each joist, including where it meets the exterior walls. …
  2. Measure the Old Joists. …
  3. Cut the Sister Joists. …
  4. Install the Sister Joists. …
  5. Install Blocking.


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