Best in 7 days
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Ships within 48 hours · Estimated delivery Aug 3 - Aug 8
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Description
Johns Manville R-38 Attic Unfaced Fiberglass Batt Insulation, 63.33-sq ft Coverage (23.75-in W x 48-in L) - U1348SR 38 Unfaced Fiberglass Batt Insulation for Attics Formaledehyde free fiberglass batts deliver R 38 thermal performance for attics and cathedral ceilings. Pre cut 48 in lengths fit 24 in on center framing and provide 63. 33 sq ft of coverage per pack. Key Features: High R Value Performance: R 38 insulation boosts energy efficiency and comfort Unfaced Design: No vapor barrierideal for adding over existing insulation Pre Cut Convenience: 48 in batts
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
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Best in 7 days
Best in 7 days
Best in 7 days
Best in 7 days
4.1 ★★★★★
Based on 665 reviews
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Product Reviews
★★★★★ 5
Super sticky!
I find all sorts of uses for this tape. It’s super sticky on both sides and could be used for a wide variety of applications. Maybe an eighth of an inch thick, which works well for uneven surfaces. My last use was hanging mirrors on the wall, and it worked great.
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Reviewed in the United States on January 22, 2026
★★★★★ 1
Adheres only to itself.
This stuff will only stick to itself! Can't put down a layer and hope it adheres to a surface.
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Reviewed in the United States on April 8, 2026
★★★★★ 5
Great seal
Great seal. Very little chemical smell.
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Reviewed in the United States on May 5, 2026
★★★★★ 5
Loved it
Amazing! loved it.
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Reviewed in the United States on April 17, 2026
★★★★★ 3
Good tape, not very sticky
This worked well. I used this to water proof a camper shell. I had to manually hold it in place because it wasn’t sticky while applying between sheet metal seams.
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Reviewed in the United States on February 11, 2026
