Insulation Batts

What Are Insulation Batts?

Insulation batts are pre-cut sections of bulk insulation designed to fit between framing members such as wall studs, ceiling joists and floor joists. Common materials include glasswool and polyester. Their structure traps pockets of air that help resist heat flow through the building envelope, reducing unwanted heat transfer between indoor and outdoor spaces. Unlike insulation rolls, which are supplied in continuous lengths, batts come in individual pieces manufactured to defined dimensions. This makes them suitable for many standard wall, ceiling and floor cavities.

Where Should You Install Insulation Batts?

Different areas of a building have different thermal, acoustic and dimensional requirements. Choosing insulation specifically suited to the intended application is therefore important.

Ceiling Insulation Batts

Ceiling insulation batts are installed within the ceiling or roof-space assembly to reduce heat transfer between the rooms below and the roof space above. Ceiling batts are available across a broad range of R-values and thicknesses. Higher R-value products generally provide greater thermal resistance, but the appropriate specification depends on factors including climate, building design, available space and applicable energy-efficiency requirements. Before purchasing ceiling batts, check the required R-value, joist spacing, available installation depth and product thickness.

Wall Insulation Batts

Wall insulation batts are designed to fit between wall studs and can be used in external and internal walls. External wall batts contribute to the thermal performance of the building envelope. Insulating internal walls can also contribute to reducing sound transmission between bedrooms, bathrooms, laundries, living spaces, home offices and other rooms. Check both the required R-value and the dimensions of the wall cavity before selecting a product.

Underfloor Insulation Batts

Underfloor insulation can be installed beneath suspended floors where the insulation product and construction are suitable for the application. Insulating beneath the floor can help reduce heat transfer between the occupied space and the area below, particularly where a suspended floor is exposed to outside conditions. Products installed beneath floors need to be appropriately supported and installed according to the manufacturer's requirements.

Mid-Floor and Acoustic Insulation Batts

Insulation can also be installed between storeys in multi-level homes and commercial buildings. Mid-floor and acoustic insulation batts are commonly used where reducing sound transmission between levels is important. They may also provide thermal resistance depending on the product. Acoustic performance depends on the complete floor or ceiling system, including insulation, framing, linings, penetrations and installation quality.

Which Insulation Batts Should You Choose?

Once you've identified where the insulation will be installed, the next step is choosing the appropriate material and product type.

Glasswool Insulation Batts

Glasswool is widely used for residential and commercial insulation in Australia. Glasswool batts are manufactured from glass fibres and contain pockets of air that provide thermal resistance. They are available across numerous R-values, dimensions and applications, including wall, ceiling and acoustic insulation. No Gap Insulation stocks glasswool ranges from manufacturers including Knauf Earthwool, Bradford, Pink Batts and SCG.

Polyester Insulation Batts

Polyester insulation batts are manufactured from polyester fibres and are available for various thermal and acoustic applications. Depending on the particular product, polyester batts can be used in walls, ceilings, underfloors and other building assemblies. When comparing polyester insulation, check the product's intended application, R-value, thickness, dimensions and pack coverage.

Acoustic Insulation Batts

Acoustic insulation batts are designed to contribute to reducing sound transmission through walls, floors and ceilings. They are commonly used in bedrooms, internal walls, home offices, theatre rooms and between floors. Many acoustic insulation batts also provide thermal resistance. Insulation alone does not completely soundproof a room. Overall acoustic performance depends on the complete construction system.

Understanding Insulation Batt R-Values

R-value measures resistance to heat flow. Generally, the higher the R-value, the greater the thermal resistance provided by the insulation product when correctly installed. However, the highest available R-value isn't automatically the correct choice for every project. The appropriate insulation depends on the application, climate, construction, available cavity depth and project requirements. It's also important to distinguish between the R-value of an individual insulation product and the total R-value of the complete building system. For new construction and regulated building work, refer to the project's energy assessment, building documentation and applicable National Construction Code requirements when determining the required insulation.

Insulation Batt Sizes and Thickness

Insulation batts are manufactured in different widths, lengths and thicknesses to suit different framing systems and performance requirements. Common residential batt widths include 430mm and 580mm, although other dimensions are available for particular products and framing systems. Thickness varies depending on the insulation material, product design and R-value. Check the available cavity depth before ordering to make sure the selected batt is appropriate for the space. You should also compare pack coverage, usually expressed in square metres (m²). Two products with similar dimensions or R-values can contain different quantities per pack.

Thermal vs Acoustic Insulation Batts

Thermal insulation batts are primarily selected for their resistance to heat flow, expressed as an R-value. Acoustic insulation batts are selected where reducing sound transmission is also an important objective. Many acoustic products provide both thermal resistance and acoustic benefits, so the two categories can overlap. For projects where sound control is important, consider the insulation as part of the complete wall, floor or ceiling system rather than evaluating the batt in isolation.

Insulation Batt Brands

No Gap Insulation stocks insulation batts from established manufacturers and product ranges including Knauf Earthwool, Bradford, Pink Batts, SCG and Polyester Solutions. Available products cover different applications, materials, R-values, dimensions and pack sizes for wall, ceiling, underfloor and acoustic projects. Rather than choosing by brand alone, compare the specifications of the individual product against the requirements of your project.

How to Choose the Right Insulation Batts

Before ordering insulation batts, compare:

• Application: ceiling, wall, underfloor, mid-floor or acoustic
• R-value: required thermal resistance
• Width and length: to suit the framing dimensions
• Thickness: to suit the available cavity
• Material: such as glasswool or polyester
• Pack coverage: the square metres supplied per pack
• Project requirements: including thermal, acoustic and applicable building requirements

Correct sizing is particularly important. Avoid selecting insulation based only on price or R-value without checking whether the product physically suits the intended cavity and application.

Buy Insulation Batts Online

Browse the insulation batts above to compare R-values, sizes, thicknesses, materials, pack coverage and prices. No Gap Insulation supplies insulation batts for walls, ceilings, floors and acoustic applications across residential and commercial projects. If you're unsure which product suits your project, contact our team for help before ordering. For more information about materials, applications, sizing and R-values, read our insulation batts guide.