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Open ramp door to ground level. Remove existing sponge rubber seal along the horizontal bottom of gap.

Clean thoroughly with soap and water the application area, approximately 5” inwards and 5” outwards from the center of the open-door gap. Rinse thoroughly and dry with a towel.

There are 2 options for positioning ROK BLOCK® on a ramp door floor and trailer floor that is not wood:

OPTION 1: As shown in FIG 1, one edge of seal adheres to the top of ramp door floor and the other edge of seal adheres to the lower ridge of the gap opening on the trailer side. You must use Option 1 should the gap, from the trailer floor to the ramp floor, measure over 6.25”. Instructional pictures shown use option 1.

OPTION 2: Position one edge of seal on the top of ramp door floor and the other edge of seal on the top of trailer floor.

NOTE: For an ATC Trailer with a factory installed gap cover, remove before installing ROK BLOCK®

Flush one end of seal to one of the vertical sidewalls and lay out entire seal flat across the open-door gap (FIG 2). If the flex-fold middle wants to go up or down, make sure that it’s up for the remainder of installation. Excess seal will be to one side. The seal and adhesive can be positioned over uneven surfaces.

Apply a straight line or cut pieces of marking tape along the edge of seal that will be adhered to the trailer side. Do the same along the edge of seal that will be adhered to the top of ramp door floor (FIG 2). Place aside the entire seal.

Use enclosed adhesion promoter and apply a thin layer, approximately 3/4” (1.9cm) wide, along the edges of both marking tapes. The adhesion promoter will give the adhesive excellent bonding strength. For images of this step see install instructions for Wood Floors FIG 3 and 3A. Let dry 2 minutes. Apply seal within the next 2 hours.

Roll up seal to one side. Remove 1 - 2ft (30 - 60cm) sections of both red adhesive liners. Kneel and pick up roll of seal with one hand and hold up off the surface. Use the other hand and position one end of seal to one vertical sidewall and between the edges of marking tape lines (FIG 3).

Keeping roll of seal off the surface, slowly unroll with one hand while applying moderate pressure to the top of seal, along both adhesive strips, with the other hand. Keep seal taunt, but do not stretch and slowly adhere while following the edges of marking tape and conforming to all contours.

Do not reposition seal once adhesive has contacted the surface (this will weaken the bond strength of the adhesive and voids the warranty).

To determine the trimming line press seal into side and find the corner edge. Apply a straight line using marking tape or a pen (FIG 5), starting from the corner edge of trailer floor to ramp door. Lift and trim with a scissors. Completely remove red adhesive liners and adhere following the marking tape lines.

NOTE: There might be excess seal overhanging on the ramp door side(s). This can be trimmed away or adhered (using adhesion promoter) to the side of ramp door (FIG 6).

After adhering, use your hands (especially in the corners and along any contours) and enclosed hand roller to apply very firm pressure (25lbs) to the top of seal, along both adhesive strips.

Do not close ramp door for a minimum of 90 minutes. Okay to move door to patio position.

NOTE: Cut a notch in ROK BLOCK®, as needed, to allow for any vertical supports.

When closing ramp door, the flex-fold middle can fold up or down.

Optional: To ensure that the flex-fold middle goes down, manually push down the center of seal using a rod, while slowly raising door. The rubber will take a set, after a short period of time, and fold down automatically going forward.