How much does it cost to replace roof insulation?

Author: Randy Becker  |  Last update: Saturday, February 14, 2026

Roof insulation costs $0.50 to $1.50 per square foot or between $1,500 to $4,500 for the entire project. Wall insulation costs $1 to $4 per square foot on average, depending on the area of your home's walls.

How often should roof insulation be replaced?

Attic insulation can last 80 to 100 years, but it loses its energy efficiency benefits over time. You should upgrade it every 15 years to ensure that it is still performing the job. Here are a few signs that indicate your attic insulation needs to be replaced: Your energy bills are increasing.

How much does it cost to replace attic insulation?

Attic insulation costs anywhere from $1,680 to $3,125, depending on the size of your attic and the material used. On average, most homeowners shell out around $2,380. These costs include the insulation materials and installation by a professional.

Do I need to remove old attic insulation before installing new?

Do I Have To Remove Old Insulation? Unless your insulation is wet, moldy or infested with pests, you don't need to remove it before adding insulation on top of it. ENERGY STAR® recommends that you inspect your insulation for signs of mold, mildew, moisture and pest infiltration before making this determination.

How much does it cost to insulate a 1000 sq ft attic?

The national average cost to insulate an attic is $2,000 to $3,250. Most homeowners pay around $2,500 to fully insulate a 1,000 sq. ft. attic with a mixture of fiberglass batts and blown-in cellulose.

How much does a conservatory roof cost? | UK Cost Guide 2025

Can you put too much insulation in a roof?

Yes, too much loft insulation can cause dampness in some situations. Loft insulation works by trapping warm air inside a building, preventing it from escaping through the roof. This helps to keep the interior of the building warmer in cold weather, reducing the need for heating and saving energy.

Is replacing attic insulation worth it?

Installing and maintaining attic insulation is beneficial in making homes energy efficient and comfortable. When the attic insulation is in excellent shape, the HVAC system does not have to work as hard, saving you money by avoiding repairs or insulation replacement.

What is the labor cost to install insulation?

Most installers charge between $40 and $80 per hour to install insulation, so the more complex the project, the more it will cost. A few complexities that may increase the cost of labor include: Your installer needs to install insulation in hard-to-reach areas.

How much to install roof insulation?

To help you get an idea of how much insulating your roof might cost based on its size, hipages, a tradie listing platform, estimates that it can range from $50-$70 per square metre for installation. When it comes to buying materials, insulation can generally be bought either per square metre or per roll.

What is the best insulation for attics?

If you consider to insulate your attic or crawlspace it will be hard to beat the quality of spray foam because it outperforms other insulation materials in terms of R-value, resistance to mold and moisture damage, durability, air sealing, and versatility.

Do roofers replace insulation?

If you need attic or roof insulation, your roofing replacement is the time to do it! This is especially true if you're installing rigid foam insulation, where you'd need to tear off the shingles to access the sheathing anyway. In some cases, roofers have been known to help with blown-in insulation, as well.

Can you insulate an existing roof?

Can you insulate over an existing flat roof? In order to overlay a warm flat roof, a moisture test must be carried out using a moisture meter. If the existing insulation is wet it must be removed. All components must be in good condition - this includes the full build up.

Is insulating the roof a good idea?

For optimal energy efficiency, your home should be properly insulated from the roof down to its foundation.

How often should you insulate your roof?

As 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.

Does roof insulation keep house cool?

The short answer, yes, insulating the attic is an effective way to keep your home cooler during the summer months. While it's a given that the insulation in your attic will keep the home warmer during the winter, it isn't immediately obvious that insulation can also help to keep the home comfortable during the summer.

How thick should insulation be on residential roof?

To determine the ideal insulation thickness, you need to identify your climate zone and the recommended R-value. According to Energy Star, given that the material has an R-value of at least R3 per inch, a roof in a warmer climate zone must be between 13 and 14 inches.

Does Lowe's install insulation?

If you're considering crawlspace insulation or attic insulation installation, you don't need to worry about finding insulation companies or insulation contractors to do the job. Lowe's is here to help with our blown-in and batt insulation installation service.

Do insulation installers remove old insulation?

Any reputable insulation installer will thoroughly remove old insulation before putting in the new. However, as a homeowner, you should double-check that they remove all of the old insulation as a first step.

How much does it cost to redo attic insulation?

Insulating an attic costs $2,100 on average. The price you'll pay can range between $1,700 and $2,500, or around $1 to $3 per square foot. The total cost depends on a few factors, like the type of insulation you need and how much you plan to use.

What is the most expensive insulation?

Spray foam insulation is the most expensive insulation, and it's available in open-cell and closed-cell options.

How often should attic insulation be replaced?

However, due to its construction with natural materials, eventually the product will lose effectiveness. Fiberglass insulation typically needs to be replaced 15-20 years into it's life, as it can easily become dirty, wet, moldy, and ineffective if there's a roof leak or water damage of any kind.

Previous article
Will a box of baking soda deodorize a room?