Inside corners that cannot be flashed with molded inside corners or by folding, such as the intersection of a sloped roof valley with a flat roof, can be sealed with multiple layers of Uncured Laminate Tape. This is a 6” wide self-adhesive lamination of uncured EPDM rubber and Butyl seam tape that has no “memory” so it can be permanently stretched into a three-dimensional corner. If the corner disc shown is stretched significantly, apply a second layer to compensate for thinning.
STEP 1: Clean all surfaces with
toluene, naptha, or white gasoline.
STEP 2: Cut a 4” round disc of Uncured
Laminate Tape and remove the release paper.
STEP 3: Firmly press the center
of the tape disc into the corner.
STEP 4: Form the tape disc against
all surfaces and their intersections.
STEP 5: Clean the
surface of the tape disc
STEP 6: Press a folded piece of Laminate
Tape onto one surface, tacky surface out.
STEP 7: Unfold the tape slowly,
avoiding bridging at the corner.
STEP 8: Fully unfold the tape and
press it into the second surface.
STEP 9: Clean the tape surface and
apply a second overlapping tape.
STEP 10: Firmly roll all
surfaces of all tapes.
STEP 11: Caulk all edges with
Silicone Caulk for EPDM.