0 ratings
Knauf R-38 Unfaced 15 by 48 Fiberglass Batt Insulation Fits 2x10 Attic High Density (Cathedral) a Total of 8 Bags and Square Footage of 320 SQFT
With a R-Value of R-38, this high-density insulation is perfect for your cathedral ceilings and attic cavities.
Knauf R-38 Unfaced 15 by 48 Fiberglass Batt Insulation Fits 2x10 Attic High Density (Cathedral) a Total of 8 Bags and Square Footage of 320 SQFT
Item #: 143207278

Knauf R-38 Unfaced 15 by 48 Fiberglass Batt Insulation Fits 2x10 Attic High Density (Cathedral) a Total of 8 Bags and Square Footage of 320 SQFT

Item #: 143207278

€ 976

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
us Imported from USA store

QTY:

Order now and get it around Thursday, August 13
Our Top Logistics Partners
  • fedex
  • dhl
With a R-Value of R-38, this high-density insulation is perfect for your cathedral ceilings and attic cavities.
U-Care Warranty:
None
Select a Plan
buy now pay later

Buy Now Pay Later

fast shipping

Fast
Shipping

free return

Free
Return*

secure packaging

Secure Packaging

100% original products

100% Original Products

pci-dss

PCI DSS Compliance

iso certified

ISO 27001 Certified


paypal payment
visa payment
mastercard payment
klarna payment
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
The Knauf R-38's high-density fiberglass provides superior insulation, enhancing energy efficiency and comfort in cathedral ceilings by effectively reducing heat loss and maintaining temperature stability.
Generous Coverage
With a total square footage of 320 SQFT, this insulation offers ample coverage, making it ideal for larger attic spaces while simplifying the installation process and ensuring consistent thermal performance.
Unfaced Design
The unfaced design of the Knauf R-38 allows for versatile installation options, easily integrating with various vapor barriers and building materials, ensuring moisture control and enhanced durability in various climates.

Product Details

Shop Knauf R-38 Unfaced 15 by 48 Fiberglass Batt Insulation Fits 2x10 Attic High Density (Cathedral) a Total of 8 Bags and Square Footage of 320 SQFT online at a best price in Ireland. B081FHR3JQ
Brand NameKnauf
ManufacturerKnauf
UPC746175889315
Manufacturer Part NumberKNR38X15HDX48UF8Temp
Item Dimensions L x W48"L x 15"W (121.9 cm)
Material TypeFiberglass
MaterialFiberglass
BrandKnauf
Product Dimensions (L x W x H)48"L x 15"W (121.9 cm)
Number of Items48

Who Should Buy?

Suitable For
  • Home Renovators

    Ideal for homeowners updating insulation in attics, improving energy efficiency and comfort in residential spaces.

  • Contractors and Builders

    Construction professionals looking for effective insulation solutions for cathedral ceilings and high-density areas will benefit significantly.

  • Energy-Conscious Families

    Families wanting to reduce energy bills can easily install this insulation for better heat retention during seasons.

Not Suitable For
  • DIY Beginners

    Inexperienced users may struggle with installation, potentially leading to improper fitting and reduced insulation effectiveness.

Product Description

Knauf R-38 Unfaced 15 by 48 Fiberglass Batt Insulation Fits 2x10 Attic High Density (Cathedral) a Total of 8 Bags and Square Footage of 320 SQFT

Have any Query? Chat with us

Customer Questions & Answers

  • Question: What is R-38 fiberglass batt insulation and how does it work?

    Answer: R-38 fiberglass batt insulation is a type of thermal insulation designed to minimize heat transfer, keeping your home warm in winter and cool in summer. It achieves this through its high-density structure, which traps air within its fibers. For installations, such as in attics with 2x10 framing, this insulation fits snugly, creating a barrier against energy loss. Utilizing R-38 insulation can significantly reduce energy bills over time, making it ideal for climate-controlled areas.
  • Question: How many bags of R-38 insulation do I need for my attic?

    Answer: For a standard attic space of 320 square feet, you will need a total of 8 bags of R-38 unfaced fiberglass batt insulation. Each bag typically covers 40 square feet, so dividing your total square footage by the coverage provides the exact number of bags required. This calculation ensures that you have adequate insulation to achieve optimal energy efficiency, preventing heat loss and enhancing comfort throughout your home.
  • Question: Can R-38 insulation be used in cathedral ceilings?

    Answer: Yes, R-38 unfaced fiberglass insulation is ideal for cathedral ceilings, particularly in areas where space for traditional insulation is limited. The high density of this insulation allows it to fit snugly between joists or rafters. When properly installed, it can effectively reduce heat transfer, maintaining consistent temperatures in your living space while also preventing condensation and potential moisture problems.
  • Question: What is the difference between unfaced and faced insulation?

    Answer: Unfaced insulation lacks an additional vapor barrier, which makes it more versatile for various applications, including attics. Faced insulation, on the other hand, comes with a moisture-resistant barrier that is useful in areas prone to humidity. Using unfaced insulation allows for a more seamless installation in spaces where moisture control is not a concern, such as in attics with adequate ventilation. It’s important to choose the right type based on your specific insulation needs.
  • Question: Is R-38 insulation fire-resistant?

    Answer: Fiberglass insulation, including R-38 products, is inherently non-combustible, meaning it won't ignite and burn like some materials. While it can withstand high temperatures, it’s essential to maintain proper installation practices to prevent any fire hazards. In structures, this means avoiding gaps and using appropriate barriers where necessary. The fire-resistant properties of fiberglass help enhance safety in residential settings, allowing for efficient insulation without compromising safety.
  • Question: How is R-38 insulation installed?

    Answer: Installing R-38 fiberglass batt insulation involves first measuring the space to ensure precise fits. Begin by laying the batts between the joists or rafters without compressing them, as maintaining their thickness maximizes efficiency. Cutting the batts to fit around any obstacles is key to a tight seal. This method effectively minimizes air gaps, ultimately improving the insulation’s thermal performance. Proper installation aids in the overall energy efficiency of your home.
  • Question: What are the benefits of using high-density fiberglass insulation?

    Answer: High-density fiberglass insulation, such as R-38, offers excellent thermal performance and energy efficiency, making it an ideal choice for insulation needs. It provides superior resistance to heat transfer, which can lead to significant energy savings. Additionally, its high density helps in sound insulation, reducing unwanted noise transmission between rooms. This makes R-38 suitable for quiet spaces such as home theaters or bedrooms, enhancing comfort and livability in your home.
  • Question: Can I install R-38 insulation myself, or should I hire a professional?

    Answer: While many homeowners can successfully install R-38 insulation as a DIY project, it can depend on your comfort level with home improvement tasks. For those with basic skills, the installation process can be straightforward and rewarding. However, if you’re unsure about proper techniques, potential safety hazards, or if your attic access is challenging, hiring a professional ensures that the insulation is installed correctly and efficiently, maximizing performance.
  • Question: How does the thickness of R-38 insulation affect its performance?

    Answer: The thickness of R-38 insulation contributes significantly to its thermal resistance, or R-value, which is a measure of its effectiveness in resisting heat flow. A thicker batt provides greater insulation performance, making it ideal for extreme climates. The increased thickness also helps in soundproofing, creating a quieter home environment. Therefore, selecting R-38 means opting for superior performance, especially in areas that require optimal temperature control, such as attics.
  • Question: Where can I buy R-38 Unfaced 15 by 48 Fiberglass Batt Insulation in Ireland?

    Answer: You can purchase R-38 Unfaced 15 by 48 Fiberglass Batt Insulation from Ubuy in Ireland. Ubuy offers a wide range of high-quality insulation products, including this specific type, ensuring you can find the materials necessary for your insulation projects. Shopping online through Ubuy provides added convenience, allowing you to choose the right quantity and have it delivered directly, streamlining the process of outfitting your attic with effective insulation.

Knauf Fiberglass Editorial Review

No editorial reviews found

Customer Reviews & Ratings

5.0
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

trustpilot logo
4.2/5 9250 + reviews
Read reviews
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.