3M™ Fire Barrier Water Tight Sealant 1003 SL
3M™ Fire Barrier Water Tight Sealant 1003 SL
3M™ Fire Barrier Water Tight Sealant 1003 SL is a high-performance, self-leveling silicone sealant that provides both fire protection and waterproof sealing for horizontal floor applications.
It delivers up to 3 hours of certified fire and smoke resistance while creating a durable UL Class 1 watertight barrier to protect buildings, equipment, and lower levels from leaks and spills.
Its self-leveling formula eliminates hand-tooling, while its flexible design accommodates building movement and helps reduce sound transmission, making it ideal for commercial, healthcare, industrial, and critical infrastructure projects.
2-in-1 Protection: Combines a 3-hour certified fire and smoke rating with a completely waterproof barrier.
UL Class 1 Watertight Rating: Effectively seals out liquid spills and water leaks to protect lower levels and equipment.
Self-Leveling Formula: Automatically flows flat into gaps when poured or pumped, requiring zero hand-tooling.
Highly Flexible: Moves dynamically with the building, compressing or stretching up to 31% without tearing.
Acoustic Barrier: Dampens sound transmission between floors for a quieter working environment.
Key Features
Dual Fire & Water Protection
Provides up to 3 hours of certified fire resistance while creating a 100% waterproof seal to prevent liquid leaks between floors.
Self-Leveling Formula
Flows automatically into horizontal gaps and settles perfectly flat, eliminating the need for manual smoothing or hand-tooling.
UL Class 1 Watertight Rating
Meets strict industry standards for moisture isolation, protecting lower levels and critical equipment from water damage.
Excellent Joint Flexibility
Accommodates natural building movement by stretching and compressing up to 31% without cracking or losing adhesion.
Sound Insulation
Helps minimize noise transmission between building levels to maintain quieter working environments.
Strong Adhesion & Long-Term Durability
Bonds effectively to common construction materials such as concrete and metal, providing reliable, long-lasting performance in demanding environments.
Applications
Commercial Buildings
Sealing floor joints, service penetrations, and perimeter gaps in offices, shopping malls, hotels, airports, and educational facilities.
Industrial Facilities
Firestopping and waterproofing around process piping, cable trays, and utility penetrations in manufacturing plants.
Parking Structures & Utility Areas
Preventing water leakage and maintaining fire compartmentation between levels.
Curtain Wall Perimeter Systems
Closing horizontal gaps between floor slabs and exterior façade systems to limit the spread of fire, smoke, and water.
Frequently asked questions
Here are some common questions about
3M™ Fire Barrier Water Tight Sealant 1003 SL
3M™ Fire Barrier Water Tight Sealant 1003 SL is a self-leveling silicone firestop sealant designed for horizontal floor applications. It provides fire, smoke, and water protection while helping seal construction joints and floor penetrations.
When properly installed in a tested and listed system, 3M™ Fire Barrier Water Tight Sealant 1003 SL provides up to 3 hours of fire protection and has been tested according to applicable ASTM and UL firestop standards.
We offer a 30-day return policy for all products. Items must be in their original condition, unused, and include the receipt or proof of purchase. Refunds are processed within 5-7 business days of receiving the returned item.
We offer a 30-day return policy for all products. Items must be in their original condition, unused, and include the receipt or proof of purchase. Refunds are processed within 5-7 business days of receiving the returned item.
Yes. It meets the UL Water Leakage Test, W Rating – Class 1 requirements, helping prevent water and moisture from passing through sealed floor assemblies.
It is designed primarily for horizontal floor applications, including construction joints, floor penetrations, curtain wall perimeter joints, and blank floor openings where a tested firestop system requires it.
Yes, it can be used to seal suitable service penetrations through fire-rated floors, including applications involving pipes, cables and conduits, provided the installation follows the applicable tested/listed system requirements.
No. It is a single-component, ready-to-use sealant, so no mixing is required before application.
Its self-leveling formulation allows the sealant to flow and settle into horizontal gaps, helping create a smooth seal while minimizing or eliminating the need for manual tooling.
Yes. The sealant offers approximately ±31% compression and extension capability, helping it accommodate movement in dynamic and static construction joints.
No. The 3M installation guide specifically states that 1003 SL is not suited for wall applications. It is intended for the appropriate horizontal floor applications specified by the applicable tested system
Yes. 3M describes the product as re-enterable and repairable, which can be useful when future maintenance or modifications to building services are required.
Yes. The product is designed to help minimize noise transfer and has achieved an STC rating of 56 when tested in an STC 56-rated wall assembly.
Arabian Arrow Supply & Services Company Limited supplies genuine 3M™ Fire Barrier Water Tight Sealant 1003 SL in Saudi Arabia as an authorized 3M™ distributor.
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