Sikalastic-621 Fluid-Applied Roofing

Sikalastic-621 Fluid-Applied Roofing is represented by Sika's US guide specification for polyurethane roofing and waterproofing system. The record connects the complete assembly specification to the principal membrane or coating data sheets named in that source.

• Specification section: 07 56 00
• System class: Polyurethane roofing and waterproofing system
• Matched technical set: one complete guide specification plus 1 principal product data sheet
• Market control: Sika US sources only

Provide a cold-fluid-applied polyurethane roofing/waterproofing system on structural concrete, plywood sheathing, cover board, metal or other substrates.

Treat this as a complete Sika assembly. Use the guide specification to select the membrane or coating, reinforcement, substrate primer, flashing materials, protection or overburden, and accessories. The principal product data sheets below describe individual materials but do not replace the assembly specification.

Confirm structural deck or existing membrane type, moisture, adhesion, drainage, contamination and movement before selection. The guide specification requires project editing; retain only substrates and options that apply, and obtain manufacturer review where the existing condition is outside the published scope.

Record the exact guide-specification title and retrieved edition, together with current product data, details, shop drawings and installer qualifications required by the edited project specification. Do not combine options retained for different assemblies without written design review.

Coordinate cleaning, repairs, primer selection, reinforcement, wet-film or consumption checks, cure windows, temperature and weather restrictions from the current guide specification and product data sheets. Document field conditions and any approved departures.

Use current Sika details at drains, penetrations, curbs, joints, perimeters and changes in substrate. Confirm how the liquid-applied membrane connects to adjacent air, water and roofing assemblies, and record reinforcement and termination work in closeout photographs.

Use the edited specification to define mockups, adhesion testing, inspections, repair of defects and required manufacturer involvement. Retain batch information, application quantities, inspection records, as-built details and the accepted technical submittal.

Verify exposure, traffic, overburden, chemical contact, ponding, code approvals and maintenance access for the selected assembly. Inspect the finished system and its transitions periodically; use cited repair guidance and preserve the installed specification edition.

Sika publishes editable guide specifications, so project teams must identify the exact downloaded source and project edits. When Sika replaces a source, add the new edition as current and preserve the earlier edition as superseded or archived with its author, timestamp, citation and status reason.

• Official system page
• Sikalastic-621 Fluid-Applied Roofing Specification — System specification
• Sikalastic 621 TC product data sheet — Product data sheet