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⚡ Part of the No Gap Group - Insulation. Energy. Interiors
⚡ 10,000+ Jobs Completed Annually
⚡ VEU Program Participant
⚡ EEC Corporate Member
⚡ Servicing Victoria & New South Wales
⚡ Upfront Pricing — No Hidden Fees. Ever.
⚡ Licensed & Insured Installers
⚡ 300+ Five-Star Google Reviews

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R1.5 Wall Insulation: A Complete Guide for Homeowners and Builders

When it comes to keeping a home comfortable year-round, insulation plays a much bigger role than most people realise. Among the many options available today, R1.5 wall insulation stands out as one of the most popular choices for interior and exterior wall applications across Australia. Whether someone is building a new home or upgrading an existing one, understanding what R1.5 really means — and what products are available — can make a world of difference.

What Is R1.5 Wall Insulation and Why Does It Matter?

The “R” in R1.5 refers to the Material R-value, which measures a material’s resistance to heat flow. The higher the number, the better it resists heat moving through a wall. R1.5 sits in the lower range of commonly used wall insulation R-values and can be a practical option for selected wall applications, depending on the building design, climate zone and applicable energy-efficiency requirements. In simple terms, this type of wall insulation helps reduce unwanted heat gain in summer and heat loss in winter, supporting ongoing thermal performance throughout the seasons. For homeowners focused on the energy efficiency of a home, choosing the right wall insulation is one of the smartest investments they can make.

Types of R1.5 Insulation Products

There’s a wide range of insulation products available that achieve an R1.5 rating, and knowing the differences helps in making the right call for any given project.

Wall Batts

Wall Batts are by far the most commonly used form of R1.5 insulation for residential walls. They come in batt form and are designed to fit snugly between standard wall studs. Batts Wall products are available in glasswool, polyester, and rockwool varieties, each with their own performance characteristics.

Batts Wall Insulation works well for both Internal Walls (to reduce sound transfer between rooms) and External Walls (to manage thermal performance). The two aren’t always interchangeable, so it’s worth checking the product specs before purchasing.

Glasswool Products

Glasswool insulation has long been a trusted material in the industry. Products made with innovative glasswool and glasswool manufacturing technology offer excellent thermal insulation properties while also being lightweight and easy to handle during installation.

FBS-1 Glasswool and the broader FBS-1 Glasswool Bio-Soluble Insulation range are popular choices in this category. These products are known for their insulation properties and are used across a variety of residential and Commercial Insulation settings.

Knauf Insulation and Knauf Earthwool are two well-known brands offering glasswool-based R1.5 options. Knauf Earthwool products are particularly praised for being low allergen, making them a more comfortable option to handle during installation.

Polyester Insulation

For those looking for a non-itchy alternative, polyester batts made from polyester fibres are an excellent option. Bradford Polymax Wall Insulation Batts is a leading product in this space. These batts are made from polyester fibres and are completely non-irritant, making them popular in homes with children or anyone sensitive to traditional glasswool.

Bradford Polymax Wall Insulation Batts also offer solid acoustic performance, adding to their appeal beyond just thermal benefits.

Foil Insulation

Foil insulation is another option that can contribute to wall insulation performance, particularly as a reflective layer. While it’s often used in Roof Insulation and ceiling spaces, foil systems can be combined with thermal batts in wall assemblies to boost performance, especially in warmer climates where radiant heat transfer is a bigger concern.

Key Products and Brands to Know

Pink Batts Wall

Pink Batts Wall is one of the most recognised insulation brands in Australia and New Zealand. The Pink Batts Wall range is widely available, trusted by builders, and delivers consistent results season after season. Their Batts Wall Insulation products come in a variety of thicknesses and are specifically designed for residential wall cavities.

Pink Batts Wall products are known for being easy to install, and their Batts Wall Insulation range is fully compatible with standard timber and steel stud framing. Whether someone is building from scratch or retrofitting, Pink Batts Wall offers a reliable, code-compliant option that’s backed by consistent Batts Wall Insulation performance across many different project types. Pink Batts Wall is especially popular among owner-builders and licensed trades alike.

SoundShield

For homes where acoustic performance is just as important as thermal performance, SoundShield is a product worth looking at. Originally developed with Acoustic Insulation in mind, SoundShield batts are designed to reduce sound transmission through Internal Walls — ideal for bedrooms, home theatres, or shared living spaces.

SoundShield products still carry thermal insulation benefits, making them a dual-purpose option that many homeowners appreciate.

Fletcher Insulation

Fletcher Insulation is another respected manufacturer in the Australian market. They offer a range of insulation products including glasswool and Acoustic Insulation options, and their products are commonly used in residential, commercial, and industrial settings.

Cladding and Wall Systems

While James Hardie is best known for cladding and fibre cement Building Products, the brand also works alongside insulation systems, making it a relevant name in discussions around wall assemblies and external wall performance.

Ceiling Batts and Roof Insulation: Don't Forget the Full Picture

While this guide focuses on wall insulation, it’s worth mentioning that walls are just one part of a home’s thermal envelope. Ceiling Batts and Roof Insulation are equally important — in fact, heat loss and heat gain through the ceiling is often greater than through walls.

Roof and ceiling systems typically require higher R-values than walls, and Ceiling Batts are available in a range of ratings to suit different climate zones. A well-insulated home combines effective batt insulation, ceiling batts, and roof systems for the best results overall.

R1.5 vs. Higher R-Values

One question that comes up often is: “Is R1.5 enough, or should a higher rating like R2.0 Wall or R2.0HD be chosen?” The answer depends on the climate zone and specific building applications.

In milder regions, R1.5 can meet minimum code requirements and deliver meaningful energy cost savings. However, in colder or hotter climates, stepping up to R2.0 or beyond is often worth the additional cost. It’s also possible to combine R1.5 thermal batts with foil insulation to achieve better overall performance without a full upgrade.

The Batts Wall product range typically covers a variety of R-values, so comparing options across the same product family is straightforward.

What to Look for When Buying: Product Details

When shopping for the right insulation batts, a few key details are worth checking before committing:

  • Product Code – Each product has a unique identifier that makes it easy to reorder or verify specifications. Always confirm the correct Product Code for the size and R-value needed.
  • Standard size – Most wall batts are designed to fit standard 90mm wall studs, but sizes vary. Checking the stud spacing before ordering avoids waste and returns.
  • Product Description – Reading this carefully helps confirm the product suits the intended application, whether it’s for interior walls, External Walls, or acoustic purposes.
  • Technical Data Sheet – For commercial projects or council approvals, this document provides detailed specs including R-values, dimensions, and compliance details.
  • Conformity CM – Some products carry this certification mark, indicating they meet relevant Australian Standards. This is particularly important for builder compliance documentation.

Warranty and Consumer Confidence

Most reputable insulation brands back their products with strong warranty terms. A Consumer Lifetime Warranty is offered by several leading brands, reflecting confidence in the ongoing thermal performance of their products. The Product Warranty terms vary between brands, so it’s worth checking whether it covers installation defects as well as material performance.

Price and Choosing the Right Product

1.5 wall insulation prices vary depending on the brand, material, batt dimensions and pack coverage. When comparing products, look beyond the pack price and check the total square metres covered, batt width and thickness to make sure you’re comparing like for like.

Before ordering, measure your wall stud spacing and calculate the total area requiring insulation. No Gap Insulation offers R1.5 wall insulation options across glasswool and polyester products, with different pack sizes to suit residential, renovation and trade projects.

Ready to compare products? Browse our R1.5 wall insulation range to check available brands, sizes, pack coverage and current pricing.

Final Thoughts

Choosing the right wall batts doesn’t have to be complicated. Whether the goal is better thermal comfort, reduced energy bills, improved acoustic insulation, or simply meeting building code requirements, there’s a product out there to match the need.

From trusted names like Knauf Earthwool, Pink Batts Wall, SoundShield, and Bradford Polymax Wall Insulation Batts to quality glasswool products from Fletcher and Knauf, the market offers plenty of solid choices. Taking time to compare product specs, check the Price range, and confirm warranty terms before buying sets any project up for success.

Good insulation is one of those things that quietly works in the background, keeping your home comfortable through every season and contributing to meaningful energy savings year after year. Getting it right from the start is always worth the effort. Ready to compare options? Browse our R1.5 wall insulation range to compare available brands, batt sizes, pack coverage and prices for your project.

FAQS

R1.5 is a mid-low R-value, making it a practical, cost-effective choice for internal walls and mild-climate external walls where extreme thermal resistance isn't required. For colder or hotter climates, or for external walls in general, stepping up to R2.0 or higher is often worth the extra cost. Our team can help assess whether R1.5 suits your specific wall type and climate zone.
Most R1.5 wall batts are designed to fit standard 90mm timber or steel wall studs, making them a straightforward fit for typical residential wall cavities. Always check the stud spacing on your project before ordering, since sizes can vary slightly between brands and product lines.
R1.5 is commonly used for internal walls because the primary goal there is usually acoustic performance (reducing sound transfer between rooms) rather than thermal resistance, since internal walls don't face outdoor temperature extremes. External walls typically call for a higher R-value, as they're directly exposed to the climate outside.
Yes — ceilings generally need a higher R-value than walls, since heat loss and heat gain through the ceiling is usually greater than through walls. While R1.5 is common for internal walls, ceiling batts typically start from R3.0 and go up to R7.0 depending on your climate zone. A well-insulated home combines the right R-value in both areas for the best overall result.
It depends on your climate and the wall's exposure. If R1.5 is currently in an external wall in a colder or hotter climate zone, upgrading to R2.0 or beyond can noticeably improve comfort and reduce energy bills. For internal walls where acoustic performance is the main goal, R1.5 is often perfectly adequate and an upgrade may not be necessary.
Both perform similarly well thermally at R1.5. Glasswool products like Knauf Earthwool and Pink Batts Wall are budget-friendly and widely available, while polyester options like Bradford Polymax are non-itch and hypoallergenic — a better fit for allergy-conscious households or DIY installers who prefer easier handling. The right choice usually comes down to budget and personal preference rather than performance differences.

What our customers say about us?

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John Fraser profile picture
John Fraser
1 year ago
Arthur and team were great. From quick turnaround on quotes to sending the team up and getting the job done in a day. It's already feeling better in the house.
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Asha d'Arville
1 year ago
We've had a really good experience with NoGap. After struggling to even get calls back from other providers, Arthur at No Gap was speedy with a quote, communicative, and really helpful in setting us up for our insulation removal and replacement. The work team were lovely, worked incredibly hard, and were on time and cleaned up after themselves. Cannot fault the team, and the house is already feeling more comfortable, and even more quiet with the new insulation.
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Paul Christian Asuncion
1 year ago
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Christian Munari
1 year ago
Very happy with the service. Arthur was easy to deal with, and the team that came out provided and installed roofing insulation in a thorough, professional and efficient manner.
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Theo Gidis
1 year ago
Helpful salesperson (Arthur), quick, efficient installation, job done very well, price very competitive. Can’t ask for anything more from a supplier/installer. Thanks Arthur and team!
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Zerocool Crash and Burn
1 year ago
No Gap Insulation - We are so happy with the service provided by No gap insulation. Arthur was especially help from the start to the completion of the service, stepping us through every decision. Highly recommended.
Response from the owner
1 year ago
Hi, we really appreciate you taking the time to leave a positive review! Your feedback means a lot to us as we continually strive for excellence. Thanks for your recommendation!
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geoff grace
1 year ago
Thank you for the assistance
Response from the owner
1 year ago
Hi Geoff, we really appreciate you taking the time to leave a positive review! Your feedback means a lot to us as we continually strive for excellence. Thanks for your recommendation!
Andrew Tan profile picture
Andrew Tan
1 year ago
We recently engaged No Gap Insulation and found the whole process, from quotation through to installation, absolutely seamless. Arthur was my single point of contact throughout — he was professional, responsive to my queries, and made everything straightforward. The work involved removing and disposing of the existing insulation batts and installing new ones. The team was very thorough, and I appreciated being shown clear before-and-after photos to see the difference. Overall, an excellent experience — highly recommended.
Response from the owner
1 year ago
Hi Andrew, we really appreciate you taking the time to leave a positive review! Your feedback means a lot to us as we continually strive for excellence. Thanks for your recommendation!
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Thibault ledesma
1 year ago
Great service overall. Arthur and his team with Jacob were very efficient and professional.
Response from the owner
1 year ago
Hi Thibault, we really appreciate you taking the time to leave a positive review! Your feedback means a lot to us as we continually strive for excellence. Thanks for your recommendation!
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Neels Holtzhausen
1 year ago
We highly recommend the guys at No Gap. Good price, great service. After one month we can already see the savings on our gas bill and feel the difference it makes inside. We should have done this years ago..
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Response from the owner
1 year ago
Hi Neels, we really appreciate you taking the time to leave a positive review! Your feedback means a lot to us as we continually strive for excellence. Thanks for your recommendation!

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