Butyl Sealant Tape 1 1/2 in x 60 ft 2-Pack - Double Sided Waterproof

Our review of this 2-pack double sided butyl sealant tape finds it ideal for homeowners and DIYers who need a flexible, weatherproof seal without complicated tools. The biggest reason to buy is its consistent adhesion to unpainted masonry and foundation materials, which makes it particularly useful for crawlspace encapsulation and repairing RV windows. Installation is straightforward and performs well across temperature extremes, so anyone sealing vapor barriers, boats, decks, or window seams will appreciate the practical balance of durability and ease of use.

Key Features

• Strong Adhesive: The butyl formulation grips unpainted limestone, brick, and concrete to create a durable, long-lasting seal.
• Double Sided Design: Two-sided tackiness allows for easy joining of overlapping materials and reliable seam sealing without adhesive mess.
• Weather Resistance: The tape maintains stability in heat and cold so it will not melt, leak, harden, or crack under typical exterior conditions.
• Easy Installation: The tape is pliable and can be cut to fit narrow corners, making it practical for confined crawlspace and RV window work.
• Moisture Resistance: High-quality butyl material resists moisture intrusion, supporting effective vapor barrier encapsulation.

Who It's For

This tape is best for homeowners performing crawlspace encapsulation, boat or deck maintenance, and RV or window repairs who need a dependable, straightforward sealant. Contractors doing small patch jobs and hobbyists working on outdoor projects will also find the 1.5 in width and 60 ft length per roll convenient.

It is less suitable for aesthetic interior trim work where a paintable finish or invisible seam is required, or for applications that need a structural bonding agent rather than a flexible sealant; in those cases a different adhesive or mechanical fastener should be considered.

Pros & Cons

Pros

• Strong adhesion to unpainted masonry and concrete surfaces for reliable encapsulation.
• Resists temperature extremes so it does not melt in heat or become brittle in cold.
• Double sided format simplifies seam joining and reduces the need for extra adhesives.

Cons

• Not intended to be paintable, so it may be visible on finished interior surfaces.

Specifications

Product Type	Double sided butyl sealant tape
Quantity	2 rolls
Width	1.5 in
Length	60 ft per roll
Color	Black
Suitable Surfaces	Limestone, brick, concrete, foundation walls

Our Verdict

This 2-pack of 1.5 in by 60 ft double sided butyl tape is a practical, value-oriented choice for anyone sealing crawlspace vapor barriers, RV windows, decks, or boats. Its strong adhesion to unpainted masonry and resistance to temperature and moisture make it especially useful for encapsulation and exterior repairs, offering an effective seal without specialty tools.

Frequently Asked Questions

Can this tape be used on concrete foundation walls?
Yes. The tape is formulated to adhere well to unpainted concrete and masonry, making it suitable for foundation and crawlspace encapsulation.

Will it hold up in extreme temperatures?
Yes. The butyl material is designed not to melt in heat or crack when cold, preserving the seal across typical exterior temperature ranges.

Is the tape paintable?
No. This butyl sealant is not intended to be painted and will remain visible where applied, so it is best used in concealed or utility areas.