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Product Description
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SIPs Seam Tape has been designed to withstand heavy building movement and provide a air and moisture barrier. Sips Seam Tape has superior strength and will not tear even under the most severe building movement. Our formulation also provides a 100% air and moisture barrier to help SIPs produce a great blower door result. This high performance tape will adhere easily to OSB and bond in extreme cold and wet weather due to having MicroGrab™ Adhesive Technology. Weather-Bloc's SIPs tape is simply the best on the market.
Basic Uses
Can be used on joints on walls and roofs. Can be used on any traditional points were a air and moisture barrier is necessary. Can be used for joints on other type sheathings.
  • Prevents 100% Air and Moisture Infiltration
  • Adheres to We or DryOSB
  • Provides Long-Term Joint Protection
  • Thinner for Easier Joint Application
  • Moves With Joint Expansion and Contraction
  • Conforms to Surfaces Irregularities
  • Stays Flexible Forever
  • Peel and Stick Installation
  • Maintains a Permanent Seal
  • No Primer Required
  • Widest Range of Installation Temperatures
  • Compatible with All Building Materials
  • Seals around nails
  • No Drool or Staining
  • Heated Storage NOT Required
  • Aids in Stopping Mold and Mildew
  • 5 year Shelf Life
  • Environmentally Friendly with NO VOCs
  • Made in USA
Additional Features
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Peel and Stick application for fast, accurate installation.
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Able to withstand movement and still stay incredibly strong under the harshest conditions.
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By not allowing air and moisture to enter into the building envelope, one can save on utility cost.
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This product will stay Flexible Forever giving it the advantage of moving with the expansion and contraction of the building.
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Crossed linked to provide elongation with recovery properties.
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Can be installed successfully at temperature as low as -30° F.
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Made with Pride in the
United State of America.
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Designed and manufactured with environmental awareness, this product is VOC Complaint and earth friendly.
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Micro-Grab Technology is the most advance adhesive in the world with vastly superior properties including hot, cold and wet weather adhesion.

Insure Your SIP Joints!

There are so many advantages to building with Structural Insulated Panels (SIPs). The biggest one is energy efficiency and this is accomplished by making sure the joints are air sealed properly. Many SIPs manufacturers have found that SIPs Seam Tape offers and additional level of air sealing protection to the seams. Relying on just sealant at these joints, makes the installing technician role of caulking extremely critical. Any gap or missing caulk can cause the SIP panel to have condensation issues at that joint.
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By using Weather-Bloc Seam Tape in combination with SIPs joint sealant gives that joint a 100% air barrier. This tape can not only be used on roof panels but we recommend also using them on wall panels. The thin tape design allows for drywall to be install without noticeable humps. Protect your SIPs project with Weather-Blocs SIPs Seam Tape.
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Condensation is formed when warm moist air meets cold air. One element of Moisture Management is understanding and controlling where condensation occurs. If condensation occurs due to an air leak, the moisture can cause serious damage to a structure. In building construction, the more air tight the building, the more energy efficient it is.

One of the more innovative building systems in the market is Structural Insulated Panels (SIPs). The are up to 60% more energy efficient than conventional building. The secret to their energy efficiency is "they can be constructed very air tight with less effort." The only real energy weakness that SIPs has is the seams. If the seams are constructed air tight, SIPs is one of the best structural building products on the market. If the seams leak air, it can cause problems just like an other construction system.
When moisture is allowed to enter a SIPs structure, moisture can break down the structural integrity of the system. OSB is a wood product and being exposed to moisture for a time will cause the OSB sheet to rot and decay.

The real science is the understanding of the joints and that the caulk that is used at the joints is not ment to be an adhesive (glue) but rather a air and moisture barrier. Continues caulk through the entire joint is critical - no gaps or caulking to thin.

Joints that are perfectly caulked can be very difficult to obtain. Experts recommended that a secondary "line of defense" be used to stop fair and moisture from infiltrating in through the joint. The solution is Weather-Bloc's SIPs Seam Tape. It works because it stop 100% of air or moisture infiltration at the joint, can be installed in most weather conditions and can handle building movement without losing its effectiveness.
Available Sizes


3" x 75'

4" x 75'

6" 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.