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Everflex JS: A Product Overview
When you're dealing with joints that are built to move, you need a sealant that does the same, without fail. Adheseal Everflex JS is a high-performance hybrid acrylic sealant specifically formulated for the job. Its standout feature is an exceptional low modulus elasticity, providing a massive +/-50% movement capability that far exceeds standard requirements. This means it maintains a tenacious, weatherproof seal through hot and cold climates without cracking or losing adhesion. It offers excellent slump resistance for overhead and vertical work, tools off to a clean, smooth finish, and adheres to most common building materials—including timber, metal, brickwork, and precast panels—usually without a primer. For professional applicators, Everflex JS is the reliable solution for getting dynamic joints sealed right, first time.
Core Features & Specifications
- Superior Elasticity (+/-50% Movement): Accommodates extreme joint movement, preventing sealant failure in dynamic applications like precast panels and expansion joints, which means no costly callbacks.
- Excellent Weathering & UV Resistance: The advanced hybrid acrylic formula is built to withstand harsh Australian conditions, resisting breakdown from sun and rain for long-term durability.
- Primerless Adhesion: Bonds to most common construction substrates without the need for a primer, saving time and material costs on site.
- Paintable Finish: Fully paintable once cured, allowing for a seamless integration with surrounding architectural finishes.
- Excellent Slump Resistance: Stays where you put it, even in wide vertical or overhead joints, making application clean and efficient without sagging.
The Everflex JS Advantage
- Non-Staining Formula: Engineered to not stain or discolour adjacent porous surfaces, maintaining the aesthetic integrity of the building facade.
- Easy Tooling: Possesses good non-sagging properties and tools off to a very smooth, professional surface with minimal effort.
- Isocyanate-Free: A safer choice for applicators, formulated without isocyanates while still delivering high-end elastomeric performance.
- Compliance Certainty: Meets TT-S-00230C, Class A and ASTM Spec. 834, providing the documented performance needed for project specifications.
Applications in Practice: Trade Scenarios
For Façade & Precast Installers: Sealing Large Expansion Joints
The Professional's Challenge
Sealing joints between precast concrete or tilt-up panels requires a sealant that can handle significant thermal expansion and contraction. Sealant failure here leads to water ingress, structural issues, and expensive remedial work.
The Adheseal Solution
First, install Adhefoam backer rod to the correct depth to ensure a 2:1 width-to-depth ratio and prevent three-sided adhesion. Apply Everflex JS, ensuring a solid fill. Its +/-50% movement capability provides more than enough flexibility to handle the dynamic movement of the panels, ensuring a durable, watertight seal that lasts.
Best Practice Note
Tool the sealant off immediately to a flat or slightly convex finish, not concave. A concave finish thins the sealant at the edges where stress is highest, increasing the risk of adhesion failure over time.
For Window & Door Installers: Perimeter Sealing
The Professional's Challenge
Creating a weatherproof seal around window and door frames that are set into brickwork, blockwork, or timber openings. The seal must remain flexible, adhere to dissimilar materials, and be paintable to match the finish.
The Adheseal Solution
After ensuring the joint is clean and installing a bond breaker tape if needed, apply a consistent bead of Everflex JS. Its superior adhesion profile means it bonds reliably to timber, metal, and masonry without priming. The sealant's flexibility handles the differential movement between the frame and the building structure, preventing drafts and water leaks.
Best Practice Note
Everflex JS is water-based during cure. Check the forecast. Do not apply if rain is expected within 90 minutes, as this can cause washouts before a sufficient skin has formed on the sealant.
Frequently Asked Questions
Do I need to prime the substrate before applying Everflex JS?
Priming is not normally required for most common building materials like timber, brickwork, concrete, and metal. Everflex JS has been formulated for superior adhesion. However, for any surfaces you're unsure about, it's always best practice to conduct a small adhesion test first.
What is the correct joint depth for Everflex JS?
The recommended sealant depth is a minimum of 6mm and a maximum of 10mm, regardless of the joint width. For optimal performance, always maintain a joint width-to-depth ratio of 2:1. Use Adhefoam backer rod or a bond breaker tape to control the depth and prevent three-sided adhesion.
Can I apply Everflex JS if it looks like it might rain?
No. Everflex JS is a water-based sealant during its curing phase. You should not apply it if rain is evident within 90 minutes of application. Rain can cause washouts before the sealant has had sufficient time to form a protective skin, which will compromise the joint integrity.
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Precast & Tilt-Up Panel Joints | +/-50% movement capability accommodates high levels of thermal expansion and contraction without failure. | Facade Installers, Concreters, Builders |
| Perimeter Sealing of Windows & Doors | Superior primerless adhesion to multiple substrates (timber, metal, masonry) creates a durable, weatherproof seal. | Window Installers, Carpenters, Builders |
| Blockwork & Brickwork Control Joints | Excellent elasticity and durability prevent cracking and water ingress in masonry movement joints. | Bricklayers, Builders, Remedial Contractors |
| Sealing Joints in Metalwork & Timber | Non-staining formula with strong adhesion is ideal for architectural finishes where appearance is critical. | Carpenters, Fabricators, Builders |
Applying Everflex JS: Professional Protocol
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Joint Preparation
A successful joint starts with proper preparation. All surfaces must be completely clean, sound, dry, and free from contaminants like dust, grease, laitance, or loose material that could prevent a solid bond.
Pro Tip: For deep joints, installing the correct backer rod is critical. Use Adhefoam open cell backer rod, or if using closed cell, be careful not to puncture its skin, as this can cause gas bubbles in the curing sealant. -
Sealant Application & Tooling
Ensure backer rod or bond breaker tape is installed to achieve the correct sealant depth (6mm to 10mm). Apply Everflex JS with steady pressure, ensuring the sealant fills the joint and makes full contact with the sides.
Tooling Technique
Tool the sealant off immediately after application using a spatula. Push the sealant into the joint to ensure good wet-out and a solid contact area. Aim for a flat or slightly convex finish.
Timing: Do not apply if rain is forecast within 90 minutes. The water-based formula needs this time to form a protective skin.Pro Tip: Where rain could soak into an exposed backer rod from above (e.g., in a vertical joint), the top of the joint must be capped or protected until the sealant has cured.
Limitations & Safety
Product Limitations
Rain Affects Cure: Do not apply if rain is evident within 90 minutes. As a water-based product, rain can cause washouts before a sufficient skin has formed.
Protect Backer Rod: Ensure that water cannot soak into the backer rod before the sealant has cured, as this can compromise the joint. The top of vertical joints should be capped.
Three-Sided Adhesion: Must not adhere to the back of the joint. Always use the correct size Adhefoam backer rod or a bond breaker tape to prevent three-sided adhesion, which restricts movement and causes sealant failure.
Safety & Handling Requirements
Personal Protective Equipment
Wear protective gloves (e.g., Nitrile Rubber) and safety glasses. Avoid direct skin and eye contact. Although not classified as hazardous, the product can cause skin and eye irritation.
Ventilation Requirements
Use in well-ventilated areas. Inhalation of vapours may cause respiratory irritation. If ventilation is inadequate, appropriate respiratory protection should be worn.
Emergency First Aid
Eyes:
Flush the affected eye with an eye wash or clean water for at least 20 minutes. Seek medical advice after flushing.
Skin:
Wash the affected area thoroughly with soap and water. If irritation develops or persists, get medical attention.
Inhaled:
Remove person to fresh air. If respiratory symptoms persist, call a physician.
Swallowed:
Do NOT induce vomiting. Rinse mouth with water. Seek medical attention if symptoms develop.
For all poisoning concerns, contact the Poisons Information Centre (Australia: 131 126).
Substrate & Preparation Guide
Concrete, Brickwork & Blockwork
Surface Preparation
Surfaces must be sound, clean, dry, and free from any dirt, grease, laitance, or loose particles. Use a wire brush or grinder to remove any contaminants that could hinder adhesion. Blow out joints with oil-free compressed air.
Primer Requirements
No primer normally required
For standard, sound masonry and concrete, priming is not required. For suspect or friable surfaces, an adhesion test is recommended.
Window & Door Frames (Timber, Metal, Aluminium)
Surface Preparation
All surfaces must be clean, dry and sound. For painted timber, ensure paint is well-adhered. For metals, remove any oxidation or corrosion and ensure the surface is free of oils or protective films.
Primer Requirements
No primer normally required
Everflex JS provides excellent primerless adhesion to most common frame materials. Ensure surfaces are thoroughly cleaned for best results.
Plastics (Acrylic, Polycarbonate)
Surface Preparation
Ensure plastic surfaces are clean, dry, and free from any grease or release agents. A light solvent wipe with a compatible cleaner may be required. Always test on a small, inconspicuous area first.
Primer Requirements
No primer normally required
Adhesion to acrylic and polycarbonate is excellent, but due to the wide variety of plastic compositions, an adhesion test is always best practice.
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