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Product Description
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Seam Sheathing Tape is design to aid in reducing moisture and air infiltration at the seams. This product will adhere to OSB even in wet or freezing weather conditions and really is a fur flashing tape. It can has the ability to seal up many of the sheathing products* that are used on the market today. This tape can also seal rips, tears or fastener heads on many house wrap product.*

Seam Sheathing Tape provides a permanent seal on joints and affordably aids in the reduction of heating and cooling costs. It bonds aggressively adheres when no other tape will-even in severe cold and wet weather conditions due to the use of our Micro-Grab Adhesive Technology™.

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Basic Uses
This waterproof seam flashing tape can be used on house wrap, or Sheathing product. *Due to the large variety of house wraps and sheathing products please contact us for compatibility updates.

Even Seals Up OSB Seams

On of the big challenges in construction today is finding and using products that keep the shell dry and seal air leaks. Outdoor air that leaks indoor makes it difficult to maintain comfort and energy efficiency. In addition, air leakage accounts for as much 40% of the energy used for heating and cooling in a typical home.
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Air sealing a structure starts with the building envelope and unfortunately, there are hundreds of penetrations through a typical home's exterior. These cracks or gaps are often within the framing details and from penetrations for doors, windows, electrical, plumbing and etc.

Joint or seams in exterior sheathing that have air leaks can be address by using “seam tape.” Many tapes on the market do not perform well in this environment. What works in a lab, often does not work well in the field. Using Weather-Bloc’s Seam Sheathing Tape is actually designed for the harshest construction conditions and a diverse array of building materials.
  • For Residential or Commercial Use
  • No Primer Required
  • Self-adhering, Peel and Stick
  • Easy Start™ Edge For Fast Installation
  • Air and Moisture Barrier
  • Helps Stop Energy Loss
  • Twice as Strong as Other Tapes
  • Seals around nails
  • Stays Elastic, Does Not Oxidize or Dry Out
  • Conforms to Surfaces Irregularities
  • No Drool or Staining
  • Stick to OSB, Vinyl, Foams*, Wood and Others
  • No Heated Storage Required
  • Workable for Precise Placement
  • Thin Design for Better Formability
  • Compatible with All Building Materials*
  • Helps Stop Mold and Mildew
  • Available in 4 Widths
  • No VOCs and Environmentally Friendly
  • Micro-Grab Adhesive Technology
  • 5 year Shelf Life
  • Limited Lifetime Warranty
  • Made in USA
Available Sizes


1.5" x 75'

2" x 75'

3" x 75'

4" x 75'
















Customizable Sizes Available

We believe that Xtreme Weather Flashing tape is the best on the market. We believe it is better than all others flashing tapes including 3M 8067, DuPont Tyvek Tape, Nashua Select, Protecto Super Stick, Grace Vycor Plus, Protecto Wrap Bt-25XI, Henkel OSI TeQ Flash, Windowwrap PSX-20, MFM WindowWrap PowerBond, Henry Blueskin WB, barricade Ulti-Flash, Mpn 45804, Nashua Optiflash, Polyguard, York RESHS09, Shadowlastic, Baricade, Aquaseal Hyband, Adchem DrainFlash and Typar Flashing.