Exposed horizontal joint
501LSB1 — Black self-leveling lap sealant
10.3 oz tube; manufacturer's base family 501LSB. Confirm compatibility with the actual membrane and accessory.
View partDicor RV Roof Termination, Vent Flange & Sealant Parts Guide
Use this RV roof-termination and accessory-flange parts guide to distinguish the roof membrane, primary butyl seal, mechanically fastened molding, exterior lap sealant and dedicated accessory gaskets. They do different jobs. Always identify the roof system and the accessory manufacturer's installation requirements before choosing products.
Original Dicor roof-edge and roof-vent assembly drawing
Open the TUFFLEX PVC factory installation drawing (PDF). It illustrates the actual accessory and termination bars, fasteners, butyl beneath flanges and lap sealant over exposed fastener heads. That drawing is specific to TUFFLEX, not a universal instruction for EPDM, TPO or other PVC brands.
For a different system, use the EPDM Plus factory installation guide. This separately specifies its own Ultra primer and 610SASL sealant in addition to butyl tape. Its treatment of plastic accessories is not interchangeable with an ordinary 501/551 application.
Component-location key
Identify the existing membrane and its bonding requirements before choosing any adhesive, kit or primer.
On the factory drawing, tape lies between mating roof surfaces and vent/termination flanges. It is not an exposed lap sealant.
Termination molding mechanically retains the roof edge. Its metal profile and vinyl screw cover are separate components.
Where approved, self-leveling 501 suits horizontal roof joints; non-sag 551 suits taller flanges and vertical areas.
A rooftop air conditioner may require a compressible mounting gasket instead of ordinary sealant beneath its base.
Roof termination and vent-flange sealing products
Bulk horizontal sealant
501LSW-25 — White self-leveling lap sealant, case of 25
Case quantity: 25 tubes, each 10.3 oz. Not a single tube; verify pack details on the exact listing.
View partVertical / tall flange
551LSD1 — Dove non-sag lap sealant
10.3 oz tube, manufacturer's 551LSD family. It retains shape on appropriate upright joints; differs from self-leveling 501.
View partBetween mating surfaces
451BSG1 — Grey gunnable butyl primary sealant
10.1 oz cartridge. A gunnable primary joint sealant, not the same form or order unit as BT-1834 tape.
View partSystem-specific roof kit
401-CK — DiFlex II roof-installation kit
Manufacturer's DiFlex II family: bonding adhesive, butyl tape and lap sealant. Check the installed roofing system before ordering.
View partDifferent roof system
601-CK — EPDM Plus roof-installation kit
Includes EPDM Plus bonding adhesive, butyl, Ultra self-leveling sealant and its primer. Not a DiFlex II substitute.
View partSpecific Ultra system
RP-USP-P — Ultra Sealant Primer, pint
Used before Dicor Ultra Sealant on its specified substrates. Manufacturer prohibits applying to stressed polycarbonate plastics.
View partAir-conditioner accessory
ACGR-1 — Roof A/C replacement-gasket kit
Includes gasket, levelling blocks and compression guides. Follow the A/C manufacturer’s mounting instructions.
View partBefore choosing replacement materials
BT-1834-5 — check the pack size. Dicor's butyl-tape listing identifies BT-1834-5 as multi-roll packaging rather than a single 30-foot roll. Verify the quantity and size of rolls supplied before ordering.
502LS versus 501/551. The TUFFLEX factory drawing specifies 502LS on its roof system. Although Dicor also documents compatibility of current 501 and 551 families with EPDM, TPO and PVC membranes, do not treat them as manufacturer-authorized substitutions for every TUFFLEX installation without checking the specific installation instructions.
Primer restrictions. Dicor Ultra Sealant Primer is for its Ultra system and must not be used on stressed plastics such as polycarbonate skylights.
Consult the 501 self-leveling and 551 non-sag manufacturer specifications, plus the Dicor factory roofing catalog for system kit contents.
Related reference pages and collections
For rigid metal profiles, see aluminum roof-edge and gutter trim; for removable screw covers, see vinyl molding inserts. For seal patches and repair tape rather than installation layers, see the roof repair tapes guide.
Explore roof repair, sealants and membranes for other catalog products.
Service caution: A roof repair must maintain structural support and drainage. Never remove fastened termination molding or work on a roof not designed for pedestrian loading without the correct service procedure.
Récemment consulté
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