Waterproofing Roofs and Terraces: Sika Product Guide
Quick answer: to waterproof a trafficable terrace or roof, Sika offers everything from a liquid coating you apply directly with a brush or roller (SikaFill®-365 Terrace) to a professionally sprayed polyurea membrane (Sikalastic®-840 ES) for more demanding roofs. Sealing tapes (MultiSeal, MultiSeal BT, and Flexitape Heavy) solve specific problem spots: gutters, chimneys, broken tiles, and joint reinforcement.
Liquid Waterproofers
| Product |
Type |
Ideal For |
Application |
| SikaFill®-365 Terrace |
Elastic acrylic rubber coating |
Terraces and roofs on homes with leaks |
Brush or roller, suitable for advanced DIYers |
| Sikalastic®-840 ES |
Hot-sprayed pure polyurea membrane |
High-demand roofs, tanks, and tunnels |
Professional spraying with specialized equipment |
Tapes and Reinforcements for Specific Problem Spots
-
Sika® MultiSeal: self-adhesive bituminous tape with metal film. For gutters, chimneys, and broken tiles.
-
Sika® MultiSeal BT: the same concept with a butyl rubber core and aluminum film, for more demanding sealing jobs.
-
Sika® Flexitape Heavy: polyamide fabric tape that reinforces Sikalastic® liquid membranes at expansion joints and crack-bridging areas.
How to Choose
-
Domestic terrace with leaks you want to fix yourself or with your usual installer: SikaFill®-365 Terrace.
-
Large roof, tank, or project that requires seamless professional application: Sikalastic®-840 ES, always applied by a specialized installer.
-
A specific leak point (gutter, chimney, tile): MultiSeal or MultiSeal BT, with no need to waterproof the entire roof.
-
Reinforcing an expansion joint before applying the liquid membrane: Flexitape Heavy.
Before Waterproofing
- Thoroughly clean the surface with Sika Limpa, removing dust, grease, and loose debris.
- Repair any significant cracks or fissures before applying the liquid waterproofer.
- Reinforce critical points (corners, joints, wall junctions) with tape before the final coat.
Frequently Asked Questions
Can I apply SikaFill-365 Terrace myself?
Yes, it's a liquid coating designed to be applied with a brush or roller, although on large surfaces or with significant damage it's advisable to hire an installer.
What's the difference between MultiSeal and MultiSeal BT?
MultiSeal is a bituminous tape with metal film; MultiSeal BT uses a butyl rubber core with aluminum film, designed for more demanding and durable sealing.
Can I apply the Sikalastic-840 ES polyurea membrane myself?
No, it requires hot spraying with specialized equipment and trained personnel; it's a professional product for high-demand roofs and tanks.
See also: expansion joints and watertightness and Sikaflex sealants.
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