For deflection joints, seismic joints, or expansion joints that are greater than one inch wide, use SureSpan EX. For joints smaller than one inch wide, you can simply use our Joint & Seam Filler and FastFlash. But joints wider than one inch need more expansion capability, and SureSpan EX is made specifically for high-movement joints such as the one demonstrated in the video.

SureSpan EX is always installed using FastFlash. So let's show you how it's done.

Step 1 - Apply a bead of FastFlash

The application itself is basically pretty simple. Lay down a bead of FastFlash. Wet-set the SureSpan into it, and then counterflash over it.

Apply a 3/8-inch bead on one side of the joint where the SureSpan EX will go. It is not a bad idea to mark beforehand the exact position where the SureSpan EX will go because you want that bead toward the edge of the SureSpan EX. Ideally, you want that FastFlash to squeeze out the edge when the SureSpan EX is pressed into the FastFlash. 

Step 2 - Place SureSpan EX into the wet sealant

Next, unroll an appropriate length of SureSpan EX and set that into the FastFlash. You can use a roller to make sure you get enough pressure to fully set the SureSpan EX into the FastFlash.

Step 3 - Counterflash with FastFlash

Next, counterflash the SureSpan EX to the sheathing by applying a bead of FastFlash to the edge of the SureSpan EX and then tooling it out. In this situation, we like to use a chip brush to spread the FashFlash out. It works really well to spread the material over uneven surfaces.

Make sure that there is enough material to completely cover the edge of the SureSpan EX. We want the transition between the SureSpan EX and the sheathing to be completely encapsulated.

Follow the same procedure on the other side of the joint. 

Remember to shingle properly

For vertical joints and also where horizontal and vertical joints meet, remember to shingle it properly so that water is directed down over the joint and not into the joint. On a vertical joint, ensure that the top piece goes over the bottom piece right. At a joint intersection, the vertical joint goes over the horizontal joint.

Once your installation has fully cured, you've got a continuous air-tight, water-tight transition.

Questions? We're here to answer them, Monday-Friday, 8 a.m.-5 p.m., Central Standard Time, at 1-800-255-4255

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