Description/Cause: A separation or fracture in a roofing material results from movement of the substrate. Splits are caused by excessive movement in the roof system. Constant expansion and contraction which accompanies freeze-thaw cycles can cause the movement, as well as cupped insulation, loss of volatile oils in the felt, and lack of tensile strength in the membrane itself.
Damage Created by Condition: Interior leakage, saturated insulation, and roof deck deterioration will result from splits. Always try to determine the contribution force behind the splitting to help alleviate any recurrence.
Suggested Maintenance/Products Required:
For BUR, Smooth & Modified Bitumen Membrane Roofs: Apply KARANK #19 Ultra Rubberized Flashing Cement per directions and KARNAK #34 Asphalt Saturated Membrane or KARNAK #31 Fiberglass Membrane then cover with additional layer of KARNAK #19 Ultra Rubberized Flashing Cement. If splits are located in areas that pond water or are the result of two different material substrates use KARNAK #229AR Elastomeric Trowel Grade.
For Single Ply Roofs such as EPDM, TPO, PVC and Hypalon: Apply KARNAK #502 Karna-Flex or KARNAK #505 Karna-Flex WB per directions and KARNAK #5540 Resat-Mat then cover with an additional layer of KARNAK #502 Karna-Flex or KARNAK #505 Karna-Flex WB. May also use KARNAK #550 Patch-N-Go Tape.
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