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Continue ShoppingBostik SL-Gyp
- $39.99
Bostik SL-Gyp
- $39.99
HYBRID GYPSUM-BASED SELF-LEVELING UNDERLAYMENT
Bostik SL-Gyp™
Premium Hybrid Gypsum / Cement Self-Leveling Underlayment
SL-Gyp™ is a premium hybrid gypsum/cement-based self-leveling underlayment designed for challenging substrates and radiant floor systems. It provides exceptional compressive strength, smooth leveling performance, and excellent flow characteristics for both renovation and new construction projects.
Hybrid gypsum self-leveling • Radiant heat compatible • Low-prep applications • Pumpable • Distressed substrate repair • High compressive strength
Product Features
Radiant Heat Compatible
Suitable for hydronic and electric in-floor radiant heating systems.
Flexible Installation Thickness
Can be installed from 1/4" up to 2" thickness without extension.
Fast Return To Service
Walkable in approximately 3–4 hours with floor coverings installable in about 2 days.
Exceptional Strength
Delivers compressive strength up to 5,000 psi for demanding flooring applications.
Ideal For Pumping
Excellent flow and consistency for professional pumping applications.
Low-Prep Applications
Ideal where shot-blasting or mechanical substrate preparation cannot be performed.
Excellent Healing Properties
Maintains healing and pour merging properties for up to 20 minutes.
Rapid Strength Gain
Fast curing performance supports efficient construction schedules.
Performance & Specifications
| Application Thickness | 1/4" – 2" neat |
| Walkable Time | Approx. 3–4 hours |
| Floor Covering Installation | Approx. 2 days |
| Working / Healing Time | Maintains pour merging properties up to 20 minutes |
| Water Requirements | 5 quarts per 50 lb. bag |
| Compressive Strength | Approx. 5,000 psi |
| Environmental Contribution | Contributes points to LEED® certified projects |
Recommended Applications
Radiant Heating Systems
Designed for use with in-floor hydronic and electric radiant heat systems.
Distressed Gypsum Floors
Excellent for repairing and leveling damaged gypsum substrates.
Plywood & Lightweight Concrete
Suitable over structurally sound plywood and lightweight concrete substrates.
Low-Prep Renovation Projects
Ideal for applications where aggressive mechanical preparation is not possible.
Mud Beds & Adhesive Residue
Can be installed over mud beds and properly prepared adhesive residue.
Commercial & Residential Flooring
Designed for demanding renovation and new construction flooring applications.
📎 Product Resources
Premium Self-Leveling Performance for Challenging Substrates
Bostik SL-Gyp™ delivers smooth leveling, rapid strength gain, and excellent compatibility with radiant heating systems and difficult renovation substrates for dependable flooring performance.
