Horizontal lap
501LSB1 — Black self-leveling lap sealant
Conventional Dicor 501 family for suitable horizontal roof joints and fastener heads. Verify surface and roof membrane first.
View matching productDicor RV Roof Flange, Lap Sealant, Primer & Butyl Tape Parts Guide
This Dicor RV roof flange, lap sealant and butyl-tape parts reference separates components that seal beneath a roof accessory from sealants applied above screws and edges. Select products according to the actual membrane, accessory material, surface slope and manufacturer's installation procedure. An attractive bead is not evidence of roof-material compatibility.
Original Dicor installation diagrams and factory product codes
Refer to Dicor's EPDM Plus roof retrofit installation guide (PDF) for original roof-termination and accessory-sealing procedures. The 2025 official roofing products catalog (PDF) identifies self-leveling, non-sag, Ultra and butyl-tape number families. Use the manufacturer documents for actual joint cross-sections and installation procedures.
Roof joint parts map — identify the layer first
Dicor BT-1834-series butyl bedding tape goes beneath applicable vents, accessory flanges and termination molding for the specific Dicor roof system.
Self-leveling 501 lap sealant or 610 Ultra (where suitable) bridges fastener heads and flat joints. It spreads and is not selected for a vertical face.
Non-sag 551 is designed for appropriate upright joints. Dicor's separate Ultra non-sag family must meet its own primer and accessory restrictions.
522AF aluminum-backed DiSeal tape is a self-adhesive exterior patching product, not the bedding tape used below a mounted flange.
Dicor requires Ultra Sealant Primer RP-USP-P when using 610 Ultra on TPO, EPDM or polypropylene. The Ultra Sealant and primer must not be applied to stressed plastics such as polycarbonate skylights. Dicor directs installers to use suitable 501/551 lap sealants for those accessories. Do not substitute the roof-coating TPO primer RP-TPR-Q for this Ultra Sealant primer.
Roof sealants, primers and butyl tape
Horizontal lap
501LSW-25 — White self-leveling lap sealant — case of 25
A CASE OF 25 tubes, not a single 10.3-ounce cartridge. Check quantity before ordering.
View matching productNon-sag
551LSD1 — Dove non-sag lap sealant
Dicor 551 non-sag family for applicable vertical transitions or seams where a self-leveling bead would run.
View matching productNon-sag
551LSG1 — Gray non-sag lap sealant
The gray finish in Dicor's 551 non-sag family. Different from the dove finish and from 501 self-leveling.
View matching productUltra
610SASLW1 — White self-leveling Ultra Sealant
Polyether Ultra system for manufacturer-approved roof materials. Requires RP-USP-P primer on TPO, EPDM or polypropylene; never use on stressed polycarbonate.
View matching productUltra primer
RP-USP-P — Ultra Sealant Primer — pint
Separate primer for Dicor 610/651 Ultra Sealant on EPDM, TPO or polypropylene. Not a general primer for ordinary 501/551 sealants.
View matching productUnder-flange
BT18341 — Gray butyl tape — 30-foot roll
Matches the normalized Dicor BT-1834-1 single-roll family. Used beneath compatible accessory flanges or termination molding, not as a UV-exposed finish.
View matching productSurface patch
522AF-450-1C — Aluminum-backed DiSeal repair tape
Manufacturer 4-inch × 50-foot aluminum-foil backed patch/sealing tape. Not a replacement for butyl bedding tape underneath roof flanges.
View matching productCheck roof material, slope and purchased quantity
Self-leveling vs non-sag: 501LSB1 is black self-leveling, while 551LSD1 is dove non-sag and 551LSG1 is gray non-sag. These are different application families, not simply alternate colours. 610SASLW1 is an Ultra polyether product subject to a separate primer system and plastic restrictions. For every choice, confirm the current Dicor technical sheet for the exact roof and accessory materials.
Package-count caution: The exact catalog item 501LSW-25 is a case of 25 cartridges, not a single 10.3-ounce tube. The exact store code BT18341 corresponds to the manufacturer-style BT-1834-1 single roll; verify the roll supplied rather than confusing it with the BT-1834-5 multi-roll carton.
Confirm the Ultra Sealant part number and colour
Dicor identifies 651SANSW-1 as its white non-leveling Ultra Sealant. A similarly written number, 651SANST1, should not be treated as equivalent without manufacturer confirmation. Check the complete product number, colour and roof-material requirements before ordering.
Roof-edge metal trim is a separate component
These sealing products do not replace the roof-edge and gutter metal molding or the flexible vinyl screw-cover insert. Confirm the roof manufacturer's fastener and bedding instructions before covering or replacing a trim joint.
Safety: Roof access, cure times, weather limits and chemical exposure depend on the specific product. Follow the manufacturer's safety and installation documents; do not use a parts-reference page as permission to walk on an unsupported RV roof or apply products to incompatible membranes.
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