Fiberglass insulation is one of the most popular and affordable insulation materials for homes across the country. If you are planning an insulation project for your attic or walls, understanding the cost helps you budget and choose the right product. Here is a complete breakdown of fiberglass insulation cost per square foot for different types and R-values.
Fiberglass insulation costs $0.50 to $2 per square foot depending on the type, R-value, and whether you install it yourself or hire a professional installer. Blown-in fiberglass is the most affordable option for attics and open areas, notes Uplift Property Management Santee. Fiberglass batts are the most common choice for walls between studs. The price includes both the material and installation labor when hired out.
Cost by Type of Fiberglass Insulation
Fiberglass insulation comes in three main types for different applications. Each type has different installation methods and price points for the homeowner. The right choice depends on the area you are insulating and whether you plan to do the work yourself or hire a professional contractor for the job.
Fiberglass batts cost $0.50 to $1.50 per square foot for material only. Batts are precut rolls that fit between standard wall stud and ceiling joist spacing. They are the most DIY-friendly option and require no special equipment for installation around the house. Professional installation of batts costs $1 to $2 per square foot total for the project.
Blown-in fiberglass costs $0.50 to $1 per square foot for material only. The loose-fill material is blown into attics using a machine that can be rented from home improvement stores for the day. Professional blown-in installation costs $1 to $2 per square foot total installed. Blown-in fiberglass is the most cost-effective option for attic insulation projects in most homes.
Fiberglass rigid board costs $1 to $2.50 per square foot for the material alone. Rigid boards are used for exterior wall insulation and basement wall applications where higher moisture resistance is needed. They provide a higher R-value per inch than batts for the same thickness. Professional installation of rigid board costs $2 to $4 per square foot total.
| Type | Material cost/sq ft | Installed cost/sq ft | Best application |
| Batts | $0.50 to $1.50 | $1 to $2 | Walls, floors, attics with standard spacing |
| Blown-in | $0.50 to $1 | $1 to $2 | Attics with irregular joist spacing |
| Rigid board | $1 to $2.50 | $2 to $4 | Basement walls, exterior sheathing |
- Batts: easiest DIY, fits standard stud spacing, no rental needed
- Blown-in: best for attics, fills gaps, needs machine rental
- Rigid board: best for basements, highest moisture resistance
Cost by R-Value
The R-value of fiberglass directly affects the cost per square foot. Higher R-values require more material and thicker insulation for the same area. The recommended R-value depends on the area you are insulating and your climate zone location. Warmer climates need less insulation than colder regions of the country.
Fiberglass batts are available in precut widths that match standard stud spacing of 16 inches and 24 inches on center. This makes installation faster and reduces waste compared to blown-in insulation that requires a blowing machine. Batts also come in rolls that can be cut to length for longer wall sections. The material is lightweight and easy to handle compared to other insulation types available at the store.
R-13 fiberglass batts cost $0.50 to $0.80 per square foot. This is the standard for 2×4 wall cavities and is suitable for most interior wall applications in homes. R-19 batts cost $0.60 to $1 per square foot. This is used for 2×6 wall cavities and attic floors in warmer climates with milder winter temperatures.
R-30 fiberglass costs $0.80 to $1.20 per square foot for attic applications in moderate climates. R-38 is the standard recommended level for most attics across the United States and costs $1 to $1.50 per square foot installed. R-49 costs $1.20 to $1.80 per square foot and is recommended for colder northern climate zones with significant winter heating needs.
R-60 costs $1.50 to $2 per square foot for the coldest regions of the country with harsh winter weather. Blown-in fiberglass costs less per R-value than batts for the same insulation level. The material is less dense and costs less to manufacture. However, blown-in material must be installed at the correct depth and density to achieve the rated R-value on the product label.
Labor Cost for Fiberglass Installation
Professional installation labor adds $0.50 to $1 per square foot to the total cost. The labor is usually included in the per-square-foot price quoted by contractors for the job. For a typical 1,000-square-foot attic, the labor cost is $500 to $1,000 of the total. The labor covers the installation work and cleanup of the project area after completion.
DIY installation saves the labor cost but requires your time and effort over the weekend. Installing batts is straightforward and can be done by most homeowners with basic tools from the hardware store. Blown-in installation requires a machine rental that costs $50 to $100 per day. The machine rental adds to the material cost but is still cheaper than professional labor overall.
Safety equipment is essential when installing fiberglass insulation in your home. The material causes skin and respiratory irritation during handling and installation. Wear long sleeves, gloves, safety glasses, and a dust mask or respirator during the work. The cost of safety equipment is $20 to $50 and should be included in your DIY budget for the project.
An insulation contractor explained: “The most common problem I see is homeowners compressing fiberglass batts behind electrical boxes or around pipes. Compressed fiberglass loses most of its R-value. The insulation needs its full thickness to work properly. Cut the batt neatly around obstacles instead of cramming it in behind them.”
Cost for Attic vs Wall Installation
The installation location affects the fiberglass insulation cost per square foot for the project. Attic installation is generally cheaper and easier than wall installation because attics are more accessible and have fewer obstructions. Walls require more precise cutting and fitting around the framing members.
Attic fiberglass insulation costs $1 to $1.50 per square foot installed by a professional crew. The attic is open and accessible from above, making it easy to install the material quickly and efficiently. Blown-in fiberglass is the most common choice for attics because it fills around obstructions like wires and pipes easily without leaving gaps or voids in the coverage.
Wall fiberglass insulation costs $1.50 to $2.50 per square foot installed by a contractor. Wall installation is more labor-intensive because the batts must be cut to fit between studs and around electrical boxes, windows, and doors in each cavity. The wall cavities must be open for installation, which means the work is typically done during new construction or major home renovations.
The total cost for a typical home varies by the size of the project and the complexity of the work. A 1,000-square-foot attic costs $1,000 to $1,500 for professional blown-in fiberglass at R-38. A 2,000-square-foot wall area in new construction costs $3,000 to $5,000 for fiberglass batts at R-13 to R-19 installed by a professional insulation contractor.
For the best results with fiberglass insulation, ensure the material is not compressed during installation. Compressed insulation loses its R-value because the trapped air pockets are squeezed out. Cut batts neatly around obstructions using a sharp utility knife for a precise fit. The insulation should fill the cavity completely without gaps at the edges or corners of the framed space for maximum thermal performance.
Fiberglass insulation manufacturers offer warranties of 20 to 40 years on their products when installed according to the instructions. The warranty covers the material against defects in manufacturing. Proper installation is essential to maintain the warranty coverage. Follow the manufacturer guidelines for storage, handling, and installation of the insulation in your project.
When budgeting for your project, include the cost of air sealing materials if they are needed. Air sealing gaps around pipes, wires, and chimneys improves the performance of fiberglass insulation by 20 to 40 percent. Caulk and spray foam for air sealing cost $50 to $150 for a typical attic project. The air sealing work should be done before the insulation is installed for the best results.
Fiberglass insulation is available at most home improvement stores and lumber yards across the country. The material cost varies by brand and R-value, with major brands like Owens Corning and Johns Manville offering products at different price points. Buying in bulk for larger projects reduces the cost per square foot. Compare prices at multiple stores before purchasing the materials for your project.
The fiberglass insulation cost per square foot for a complete home insulation project depends on many factors including the size of the area, the target R-value, the accessibility of the installation location, and local labor rates in your area. Getting multiple quotes from contractors helps ensure you pay a fair price for the work. The investment in insulation pays for itself through lower energy bills in just a few years for most homeowners who install it in their home.
Taking the time to research and plan your project ensures the best results. The investment in proper materials and installation pays off through better performance, longer lifespan, and greater satisfaction with the finished project. Use the information provided to make confident decisions for your home improvement needs. Compare options carefully and choose the solution that best fits your specific requirements and budget for the project.
Frequently Asked Questions
How much does fiberglass insulation cost per square foot?
Fiberglass costs $0.50 to $2 per sq ft for material. Installed cost is $1 to $2 per sq ft.
How much does it cost to insulate an attic with fiberglass?
An attic costs $1,000 to $1,500 for blown-in at R-38. Labor and materials are included.
Can I install fiberglass insulation myself?
DIY saves $0.50 to $1 per sq ft. Batts are easiest for DIY. Blown-in needs a machine rental.
What R-value do I need for my project?
Attics need R-38 to R-60 depending on your climate. Walls need R-13 to R-21 depending on stud depth. Check local building codes for the requirements.
Which is cheaper, fiberglass or cellulose insulation?
Fiberglass is slightly cheaper than cellulose. Both cost $1 to $2 per sq ft installed. Fiberglass is more available.
What is the difference between rolls and batts?
Rolls are long continuous sections for large open areas. Batts are precut to standard stud or joist spacing lengths. Both have the same R-value per inch thickness.
Does fiberglass insulation settle over time?
Blown-in settles 5 to 10 percent. Batts never settle. Installers add extra material to compensate for settling.
What is the most cost-effective fiberglass type?
Blown-in is best for attics at $1 to $2 per sq ft. Batts are best for walls at a similar price point.
The information provided helps you make an informed decision about your home improvement project. The right choice depends on your specific situation, budget, and goals. Consider consulting with a qualified professional who can assess your needs and recommend the best solution for your home and family.
