Question: What Insulation Should I Use In My Ceiling?

Can you put insulation on top of insulation?

According to ENERGY STAR®, you can put new insulation over old insulation, “unless it is wet.

“Faced” insulation should not be placed on top of existing insulation in the attic.

Any new roll or batt insulation installed over existing insulation in the attic needs to be without a vapor retarder (face)..

What R-value do I need for ceiling?

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.

Do you put insulation in the ceiling?

In addition to walls and attics, insulation should be installed in ceilings with unheated spaces, basement walls, floors above vented crawl spaces, cathedral ceilings, floors over unheated garages or porches, knee walls, and in between interior walls—especially bathrooms—as well as ceilings and floors.

How thick should my ceiling insulation be?

Most common types of older insulation would have been at least 100mm thick when new1, however some settlement or compression can be expected for older insulation2. In general, all areas of ceiling insulation should have a thickness greater than 70 mm above all accessible habitable spaces, as shown in table 2.

Is R38 good insulation?

The performance of an insulation material is measured by “R-Value”, where the “R” stands for Resistance. The thicker the insulation, the greater/higher it’s R-value and performance. As of 2016, the standard building code for attic insulation in L.A., Orange, Ventura and surrounding counties is R-38.

Which insulation is best?

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.

How long does Ceiling Insulation last?

15 to 20 yearsAs a general rule, insulation should be replaced or retrofitted every 15 to 20 years. However, it may need replacing or retrofitting sooner depending on the type of insulation installed, the R rating of the original insulation, compression and movement over time, and whether any damage has occurred.

Can I use wall insulation in the ceiling?

The best option is to install fiberglass batt insulation. If you use the faced variety, the facing provides an effective way to hold the insulation in place, and it creates a vapor barrier that keeps the insulation dry. … Purchase rolls or packages of insulation that will fit in the spaces between the ceiling joists.

Is it better to insulate ceiling or roof?

Saving energy costs by preventing heat loss due to heat conduction. Preventing the roof from accumulating moisture damage. Ease of construction- insulating the ceiling can be easier than insulating the roof, particularly with older homes.

How do I choose attic insulation?

The higher the R-value, the more effective an insulating material is. Your home’s R-value score will guide you toward the type of insulation you need. In general, an attic’s R-value should be between R-30 and R-49. In particularly cold climates, you might go up to R-60.

Can you use R19 in ceiling?

Most homes only have R19 in attics. To give you an idea that’s only 5 1/2 inches of insulation. That’s ok for your walls. … So by adding another R19 “5 1/2 inches will give you an R38 value.

What R value insulation do I need?

For homes in California, the attic should achieve an R-value between R-30 and R-60. Most areas of the country have a higher minimum R-value recommendation, but just about everywhere recommends up to R-60.

What does R38 insulation mean?

R38 is a measurement of the thickness and effectiveness that is found in homes in both cold and warm regions. It is at the high end of recommendations for warm regions and the low end for cold regions.

What is the thickness of R38 insulation?

approximately 12 inchesThickness of R-38 Insulation An R-38 fiberglass batt should be approximately 12 inches thick, while the thickness of cellulose insulation of a finished, fitted product will larger.

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.

What is the thickness of r30 insulation?

10-inchesTypical R-30 fiberglass insulation is 10-inches-thick.

How good is R13 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.

Which is better R30 or R19?

Insulation in your walls and ceilings slows down this heat transfer. … 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.

Is R38 better than R30?

Example: R38 has a U of 1/R or 1/38=. 026 and R30 has a U of 1/30=. 033. So R38 is about 20% better.