- Home Page /
- Industrial Supplies /
- Raw Materials /
- Laminates & Composites /
- Fiberglass /
- Knauf 491 SQFT 8 Bags of R 38 Unfaced 24 by 4...
0 ratings
Item #:
28800255
Knauf 491 SQFT 8 Bags of R 38 Unfaced 24 by 48 High Density Fiberglass Specialty Fits 2X10 Floor-Ceiling, attic
Item #:
28800255
XCD 4138
Price Details
Excluding Shipping & Custom charges ( Shipping and custom charges will be calculated on checkout )
*All items will import from US
0 ratings
Write a review
In stock
Imported from USA store
Order now and get it around Tuesday, August 18
Secured transaction
Ubuy works hard to protect your security and privacy. Our advanced payment security system ensures confidentiality by encrypting your information during transmission using AES (Advanced Encryption Standards) and SSL (Secure Socket Layer) protocols. Your payment details are 100% secure as we do not share your payment details with third party sellers.
Our Top Logistics Partners
EcoBatt insulation provides excellent acoustical properties and will reduce sound transmission when properly installed.
Fast
Shipping
Free
Return*
Secure Packaging
100% Original Products
PCI DSS Compliance
ISO 27001 Certified
Note: Step Down Voltage Transformer required for using electronics products of US store (110-120). Recommended power converters Buy Now.
What Stands Out
High Density Insulation
This fiberglass insulation offers superior thermal performance, ensuring your space remains energy efficient and comfortable throughout the year by effectively minimizing heat transfer.
Specialty Fit
Designed to fit 2x10 floor-ceiling and attic spaces, this insulation provides a tailored solution that maximizes coverage while minimizing installation time and complexity.
Cost-Effective Solution
With 8 bags covering 491 SQFT, this product presents a budget-friendly option for homeowners looking to improve energy efficiency without compromising on quality.
Product Details
| Brand Name | Knauf |
| Manufacturer | Knauf |
| UPC | 746175895439 |
| Manufacturer Part Number | KNR38X23HDX48UF8Temp |
| Material Type | Fiberglass |
| Material | Fiberglass |
| Brand | Knauf |
| Number of Items | 48 |
| Item Weight | 28 lbs (12.7 kg) |
Who Should Buy?
-
Homeowners
Ideal for homeowners looking to improve energy efficiency in attic and ceiling spaces, reducing heating and cooling costs.
-
DIY Enthusiasts
Great for DIY projects where insulation is needed, offering easy handling and installation for personal projects.
-
Renovators
Perfect for those renovating older homes, providing a modern insulation solution to improve comfort and reduce noise.
-
Professionals
Not the best choice for contractors needing large quantities; bulk options can be more cost-effective for extensive projects.
Product Description
Knauf 491 SQFT 8 Bags of R 38 Unfaced 24 by 48 High Density Fiberglass Specialty Fits 2X10 Floor-Ceiling, attic
Have any Query? Chat with us
Customer Questions & Answers
-
Question:
What is Knauf R-38 Unfaced Fiberglass Batt Insulation used for?
Answer: Knauf R-38 Unfaced Fiberglass Batt Insulation is primarily designed for insulating attics and cathedral ceilings. This product provides excellent thermal resistance, helping to keep your home warm in winter and cool in summer. Its high-density formulation ensures effective heat retention and minimizes energy costs. It’s particularly ideal for 2x10 framed spaces, maximizing energy efficiency where insulation is crucial. Homeowners often use it during construction or renovation projects to enhance overall comfort. -
Question:
How much area does one package of Knauf R-38 cover?
Answer: Each package of Knauf R-38 Unfaced Fiberglass Batt Insulation covers approximately 61.33 square feet. With 8 bags included, the total coverage becomes around 490.64 square feet, making it perfect for larger attic spaces. This concentrated setup allows you to effectively insulate a significant area, reducing the need for additional purchases. Homeowners or contractors will appreciate the efficiency of covering larger areas without interruption during installation. -
Question:
Is Knauf R-38 insulation suited for humid climates?
Answer: Yes, Knauf R-38 insulation is suitable for humid climates. Its fiberglass composition inherently resists moisture, making it less prone to mold growth compared to other insulation materials. This characteristic is essential for maintaining air quality and preventing structural issues in high humidity areas. Consequently, homeowners in these climates benefit from using Knauf insulation in attics and ceilings, ensuring a comfortable living environment without compromising structural integrity. -
Question:
How do you install Knauf R-38 insulation?
Answer: Installing Knauf R-38 insulation involves cutting the batts to fit snugly between the rafters or joists of your attic. Ensure proper safety gear is worn, including masks and gloves, due to the fine fiberglass particles. Lay the batts, unfaced side down, to allow for optimal airflow. This type of insulation works best in an unvented attic system, enhancing energy efficiency. DIY enthusiasts and contractors often use this insulation type for straightforward, effective thermal resistance. -
Question:
Can Knauf R-38 be used in walls?
Answer: Knauf R-38 insulation is specifically designed for attic and cathedral ceiling applications and is not recommended for use in walls. The R-value is optimized for horizontal applications where insulation performance needs to be maximized. For wall installations, consider using a product with a different R-value tailored to that setting for best results. It is important for contractors and builders to choose the correct type of insulation based on location to ensure effective energy efficiency. -
Question:
What are the benefits of unfaced insulation like Knauf R-38?
Answer: Unfaced insulation like Knauf R-38 offers several benefits, including versatility and ease of installation. Since it lacks a vapor barrier, it's ideal for regions where moisture control is managed through other means, like air sealing. This reduces potential issues with trapped moisture and provides flexibility in installation between various surfaces. Homeowners often prefer unfaced insulation when they have existing vapor barriers or are adding additional insulation to improve their home’s efficiency. -
Question:
Is Knauf R-38 insulation eco-friendly?
Answer: Knauf R-38 insulation is considered eco-friendly as it is made from at least 30% recycled glass. This commitment to sustainability is reflected in the manufacturing process, which aims to reduce environmental impact. Additionally, using this insulation contributes to energy savings, further promoting eco-conscious living by lowering energy usage in homes. Many environmentally-conscious consumers opt for Knauf products to meet their insulation needs while supporting sustainable practices. -
Question:
How does R-value affect insulation performance?
Answer: R-value measures insulation's thermal resistance; the higher the R-value, the better the insulation’s performance. Knauf R-38 insulation has a high R-value, which means it provides superior resistance to heat flow. This makes it particularly beneficial for cold climates or homes needing extensive energy efficiency. Homeowners can expect reduced heating and cooling costs when using high R-value products in their attics, leading to enhanced comfort and savings over time. -
Question:
What is the best use case for Knauf R-38 insulation?
Answer: The best use case for Knauf R-38 insulation is in unvented attics or cathedral ceilings where a high level of thermal performance is essential. Its design allows for seamless installation in 2x10 framed spaces while effectively managing temperature fluctuations. Homeowners renovating or building with energy efficiency in mind choose this insulation to ensure their spaces remain comfortable year-round while minimizing energy bills. -
Question:
Where can I buy Knauf R-38 Unfaced Fiberglass Batt Insulation?
Answer: You can buy Knauf R-38 Unfaced Fiberglass Batt Insulation at Ubuy in Grenada. Ubuy offers a convenient platform for purchasing insulation products, ensuring you find the right amount and specifications for your needs. By shopping at Ubuy, you can explore a range of home improvement products along with insulation solutions, providing a streamlined shopping experience for your insulation projects.
Knauf Fiberglass Editorial Review
No editorial reviews found
Customer Reviews & Ratings
1 customers ratings
-
5 Star
100%
-
4 Star
0%
-
3 Star
0%
-
2 Star
0%
-
1 Star
0%
Review this product
Share your thoughts with other customers
Platform Trust & Buyer Confidence
MA
Mohammad
Verified buyer
“Excellent quality and original too,when ubuy send original things I will appreciate that ,I very satisfied thank you”
23 July 2026 · via Trustpilot
CK
Chitra
Verified buyer
“The order and delivery progress was communicated very well. Package arrived within the estimated time. Products arrived as expected in good condition.”
22-Jul-26 · via Trustpilot
K
kund
Verified buyer
“Good supply of products. Safe payment methods, and shipment worldwide! Genuine products.”
23-Jul-26 · via Trustpilot
OO
Onesi
Verified buyer
“Was my first time buying a product from Ubuy, but I found it so helpful. This is reliable. Gonna place a new order!”
22 July 2026 · via Trustpilot
SJ
SAO JOHN
Verified buyer
“Ubuy is a great online platform to buy stuff. Reliable, fast delivery time and great value for money. I've been using Ubuy online shopping platform for three years now and will continue to do so.”
23 July 2026 · via Trustpilot
Secure Checkout
Global Delivery
Easy Returns
Genuine Products
Product Price History
Important information
- Limitations : For products shipped internationally, please note that any manufacturer warranty may not be valid; manufacturer service options may not be available; product manuals, instructions, and safety warnings may not be in destination country languages; the products (and accompanying materials) may not be designed in accordance with destination country standards, specifications, and labeling requirements; and the products may not conform to destination country voltage and other electrical standards (requiring use of an adapter or converter if appropriate). The recipient is responsible for assuring that the product can be lawfully imported to the destination country. When ordering from Ubuy or its affiliates, the recipient is the importer of record and must comply with all laws and regulations of the destination country.
- Not all the products listed on Ubuy are for sale, as Ubuy is a global search engine. Products are subject to export/trade regulations.
XCD 4138
Order now and get it around Tuesday, August 18
This item is not restrict in my country.(Please click on above link if this item is not restrict in your country, So our team will review and allow.)
QTY:
Secured transaction
PCI DSS compliant and ISO 27001:2022 certified, with encrypted payments and full buyer protection on every order.
Our Top Logistics Partners
Fastest cross-border delivery
Features & Benefits
- Cost-effective thermal and acoustical insulation for energy-efficient construction.
- Suitable for new and retrofit applications in residential and commercial settings.
- High Density batts available for optimal thermal performance in limited spaces.
- EcoBatt insulation improves sound transmission ratings significantly.
- Certified for environmental sustainability and formaldehyde-free.
- Pickup offers a $20 discount across 150 warehouses in the US.
Ubuy Assurance
Experience worry-free shopping with 100% original products, PCI DSS-compliant payment security, ISO 27001-certified data protection, the fastest cross-border delivery, free returns *, and secure packaging on every order.