Thermal Conductivity of Fiberglass Insulation: Key Facts You Need to Know

2025-01-16

Discover the essential facts about the thermal conductivity of insulation fiberglass with FUNAS. Our comprehensive guide delves into the efficiency and benefits of fiberglass insulation, helping you make informed choices for energy-saving solutions. Trust FUNAS for expert insights and superior quality insulation products to enhance your building's thermal performance.

Table of Contents

≡

Introduction
What Is the K Value of Fiberglass Insulation?
Is Fiberglass a Good Thermal Conductor?
What Is the Thermal Conductivity of Rockwool Insulation?
What Insulation Has the Best Thermal Conductivity?
Conclusion
FAQs

Introduction

Fiberglass insulation is a popular material used in construction and industrial applications for thermal and sound insulation. Understanding its thermal conductivity is essential when choosing the right insulation for your needs. In this article, we will explore the key aspects of fiberglass insulation's thermal conductivity, answer related questions, and provide insights on its performance compared to other insulation materials.

What Is the K Value of Fiberglass Insulation?

Worker installing wholesale insulation sheet.

The thermal conductivity of fiberglass insulation is typically measured using the k-value, which represents the material's ability to conduct heat. For fiberglass insulation, the k-value generally ranges from 0.25 to 0.4 W/m·K (watts per meter per kelvin). This value indicates that fiberglass insulation has low thermal conductivity, making it an effective material for preventing heat transfer.

Fiberglass's k-value is considered moderate compared to other common insulation materials, such as foam or cellulose, which may have lower or higher k-values depending on their composition and design. A lower k-value means better insulating performance, as the material is less efficient at transferring heat.

Is Fiberglass a Good Thermal Conductor?

Fiberglass is not a good thermal conductor. In fact, it is specifically chosen for insulation purposes because of its ability to reduce heat transfer. Its low thermal conductivity allows it to keep indoor spaces cool during hot weather and warm during cold weather. This makes it an excellent choice for residential and commercial insulation applications.

The material's structure—composed of tiny glass fibers—traps air within, which enhances its insulating properties. The trapped air molecules impede the flow of heat, making fiberglass insulation effective at maintaining stable indoor temperatures and improving energy efficiency.

What Is the Thermal Conductivity of Rockwool Insulation?

Worker installing thermal wall insulation materials.

Rockwool insulation, another popular material, has a thermal conductivity range of 0.035 to 0.045 W/m·K. This is typically lower than fiberglass, making rockwool a slightly better thermal insulator in some applications. Rockwool also has the added benefit of being fire-resistant, which can be an important factor in certain settings. However, fiberglass remains a more cost-effective and widely used option for general insulation needs.

What Insulation Has the Best Thermal Conductivity?

When comparing insulation materials, a lower thermal conductivity value generally means better performance in terms of heat resistance. Some of the most efficient insulation materials with low thermal conductivity include:

Aerogel: The material with one of the lowest k-values (0.013 W/m·K), offering exceptional thermal resistance but at a high cost.
Polyurethane foam: Often used in spray foam insulation, with a k-value of around 0.02 W/m·K, making it a very efficient thermal insulator.
Cellulose insulation: Made from recycled paper products, cellulose has a k-value ranging from 0.035 to 0.045 W/m·K, similar to Rockwool.

Fiberglass is a solid option, but if you're looking for the best possible thermal resistance, materials like aerogel or polyurethane foam might be a better choice for specialized applications.

Conclusion

Fiberglass insulation remains a reliable and affordable choice for both residential and commercial applications, with its low thermal conductivity and other beneficial properties. While there are other insulation materials with even better thermal resistance, fiberglass offers a balanced performance that meets the needs of most consumers. By understanding the thermal conductivity of fiberglass and how it compares to other materials, you can make an informed decision when selecting the best insulation for your space.

FAQs

How does fiberglass insulation compare to foam insulation in terms of thermal conductivity?

Fiberglass insulation typically has a k-value of 0.25 to 0.4 W/m·K, whereas foam insulation, like polyurethane, usually has a k-value of 0.02 W/m·K. Foam insulation offers better thermal performance but may be more expensive.

Can fiberglass insulation be used in high-temperature areas?

Fiberglass insulation can withstand temperatures up to 1000°F (537°C), making it suitable for a wide range of applications, including in attics, walls, and industrial settings. However, for extremely high-temperature environments, materials like rockwool or ceramic fiber may be more appropriate.

What are the advantages of fiberglass insulation besides its thermal conductivity?

In addition to its thermal resistance, fiberglass insulation offers soundproofing benefits, is non-combustible, and is moisture-resistant, which helps prevent mold growth. It is also one of the most affordable insulation materials available.

How do I choose the best insulation for my home?

When choosing insulation, consider the thermal conductivity (k-value), cost, installation ease, and sustainability of the material. Fiberglass is a great all-around choice, but for specialized needs like fire resistance or high energy efficiency, you might explore rockwool or foam insulation.

What factors affect the thermal conductivity of fiberglass insulation?

The density and thickness of fiberglass insulation, as well as its installation method, can influence its thermal conductivity. Thicker layers of insulation or denser fiberglass may provide better heat resistance. Additionally, ensuring proper installation to prevent gaps can improve the material's overall performance.

2025 Price: Is Rockwool Cheaper than Fiberglass?

Latest Tips: What is the Life Expectancy of Insulation?

What insulation do builders use? | FUNAS Guide

What is thermal insulation for cars? | FUNAS Guide

What is the best thermal insulation for walls? | FUNAS Guide

What kind of insulation is used in cars? | FUNAS Guide

What are the different types of insulation in construction? | FUNAS Guide

Prdoucts Categories

FAQ

service

What is your shipping and delivery process like?

We offer reliable logistics services for insulation material wholesale, both domestically and internationally. Our team ensures secure packaging, timely shipping, and real-time tracking so that your order reaches you in perfect condition and on schedule.

Can I request custom dimensions or properties for my insulation needs?

Yes, we specialize in custom solutions. Whether you need specific dimensions, thicknesses, densities, or additional coatings, we can work with you to manufacture insulation products tailored to your exact requirements of good materials for heat insulation.

Are your rubber foam products environmentally friendly?

Yes, our insulation products are designed with sustainability in mind. They help reduce energy consumption by minimizing heat loss and gain, and they are made from durable materials that have a long life cycle, reducing the need for frequent replacement.

FAQ

What is the typical delivery time for custom orders?

Our daily production capacity is 800 cubic meters. Delivery time varies depending on the complexity of the insulation material wholesale order, but we can deliver large quantities of customized products within 4-6 weeks after the approval date, and small quantities can be delivered within 15 days.

What types of rubber foam insulation do you offer?

We offer a wide range of rubber foam insulation with different thicknesses and specifications. Thermal insulation material manufacturer FUNAS sleeves and sheets are suitable for different application scenarios.

You might also like

Thermal insulation material fireproof adhesive

Discover FUNAS Thermal Insulation Material Fireproof Adhesive, designed for superior protection and safety. Ideal for various applications, this advanced adhesive ensures excellent heat resistance. Trust FUNAS for quality and reliability. Enhance your building's safety with our state-of-the-art thermal insulation solution. Order today for unmatched performance and peace of mind.

Thermal insulation material fireproof adhesive

Rubber Plastic insulation Material Glue

Introducing FUNAS Rubber Plastic Insulation Material Glue: the ultimate solution for effective insulation. Engineered for superior adhesion, this glue seamlessly bonds rubber and plastic, optimizing energy efficiency. Ideal for construction and HVAC projects, trust our premium formula to deliver lasting performance in diverse environments. Experience unmatched quality and reliability with FUNAS.

Rubber Plastic insulation Material Glue

Foam Phenolic Adhesive

This product has passed the national GB33372-2020 standard and GB18583-2008 standard. (The product is a yellow liquid.)

Anggu foam phenolic glue is a kind of glue with corrosion resistance, low odor, high strength and excellent brushing property. Can be sprayed for construction with fast surface drying speed, long bonding time, no chalking and convenient operation.

Foam Phenolic Adhesive

820 Pipe special adhesive

This product has passed the EU REACH non-toxic standard, ROHS non-toxic standard. (The product is black glue.)

Anggu 820glue is a low-odor, high-strength quick-drying glue; Fast drying speed, long bonding time, no powder, non-toxic.

820 Pipe special adhesive

2025-03-15

How to Insulate New Construction: A Comprehensive Guide

Discover effective strategies for insulating new construction with our comprehensive guide by FUNAS. Learn key techniques and materials to enhance energy efficiency, reduce costs, and ensure comfort in your new building. Dive into expert insights on how to insulate new construction and make informed decisions that promote sustainability and durability. Elevate your construction projects with FUNAS.

How to Insulate New Construction: A Comprehensive Guide

2025-03-13

Does Heat Insulation Work? The Ultimate Guide to FUNAS Insulation Solutions

Discover the effectiveness of heat insulation in our comprehensive guide with FUNAS Insulation Solutions. Explore how our advanced materials can optimize energy efficiency and comfort in your space. Learn the science behind heat insulation, its benefits, and why FUNAS is the trusted choice for premium insulation solutions. Find out: Does heat insulation work? Uncover the answer with FUNAS.

Does Heat Insulation Work? The Ultimate Guide to FUNAS Insulation Solutions

2025-03-10

Ultimate Guide: What is Insulating a House?

Discover the benefits of insulating a house with FUNAS. Our Ultimate Guide explores how insulation can improve energy efficiency, lower utility bills, and enhance comfort year-round. Learn what insulating a house entails and why it's a smart investment for homeowners. Trust FUNAS to guide you through everything you need to know about home insulation.

Ultimate Guide: What is Insulating a House?

2025-03-06

Top Thermal Insulation Materials List for 2025

Discover the future of energy efficiency with FUNAS's "Top Thermal Insulation Materials List for 2025." Our expertly curated list highlights innovative solutions perfect for your construction and renovation needs. Stay ahead of the curve with cutting-edge insulation technology designed for optimal thermal performance and sustainability. Trust FUNAS for advancements that redefine comfort and efficiency in every project.

Top Thermal Insulation Materials List for 2025

Leave a message

Have any questions or concerns about our products? Please leave us a message here and our team will get back to you promptly.

Your queries, ideas, and collaboration opportunities are just a click away. Let’s start a conversation.

Please enter your name not exceed 100 characters

Name

The email format is not correct or exceed 100 characters, Please reenter!

Please enter a valid phone number!

Phone

Please enter your field_373 not exceed 150 characters

Company Name

Please enter your content not exceed 500 characters

Content

logo

FUNAS is a comprehensive technology company integrating scientific research, production, sales and construction, which can provide you with customized one-stop solutions.

Quick Links

Products