A Complete Guide to Joint Sealants for Construction & Civil Engineering

What Are Joint Sealants & Why Are They Essential?

Joint sealants play a critical role in modern construction by preventing water, air, and contaminants from penetrating joints, ensuring structural integrity and long-term performance. These sealants accommodate movement caused by temperature changes, vibrations, and settling, making them essential for a wide range of applications—from commercial buildings to highways and tunnels.

At SDG, we supply a comprehensive range of high-performance joint sealants designed for durability, flexibility, and ease of application.

Choosing the Right Joint Sealant

Selecting the correct sealant is essential to maintaining the effectiveness and longevity of any project. Key factors to consider include:

1. Joint Type & Movement Requirements

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Control Joint
Control joints are planned breaks between concrete pours that must be sealed to prevent water ingress and maintain structural continuity, even though they are not intended to move significantly.

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Expansion Joint
Expansion joints are designed to absorb movement caused by temperature changes, moisture variation, or structural shifting by allowing adjacent building elements or concrete slabs to expand and contract without causing cracks or damage.

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Isolation Joint
Isolation joints separate and prevent the bonding of different substrates, such as slabs, from columns or walls. They allow these substrates to move independently and prevent stress, vibration, or load from transferring between connected structures.

2. Adhesion & Substrate Compatibility

Hyperseal Expert 150 is a low modulus polyurethane sealant offering excellent adhesion to concrete, glass, aluminium, steel, and polycarbonate. Its bubble-free curing makes it ideal for water tanks, façades, and precast panels.
Sikaflex PRO-3 Purform is specifically formulated for floor joints and heavy-duty applications, including car parks, pedestrian walkways, and tunnels.
Arbokol AG2 Gun Grade is a polysulphide sealant with strong adhesion to concrete, ideal for roadways, parapet walls, sea walls, and structural floor joints.

3. Modulus & Elasticity

Low Modulus Sealants (Hyperseal Expert 150) provide high elasticity and are ideal for expansion joints and façade applications.
High Modulus Sealants (Arbokol AG2) offer strong adhesion and durability, making them ideal for load-bearing applications.

4. Durability & Environmental Resistance

Sikaflex PRO-3 Purform is resistant to chemicals, fuels, and extreme temperatures (-40°C to +80°C).
Arbokol AG2 Gun Grade provides excellent UV and chemical resistance, making it suitable for high-stress environments like roadways and marine structures.

Types of Joint Sealant Applications

SDG supplies joint sealants and ancillary products tailored for various construction needs:

Commercial & Industrial Applications

Perimeter Sealing for Windows & Doors: Ensures airtightness and weather protection.
Floor Joints in Warehouses & Production Areas: Sikaflex PRO-3 Purform offers high mechanical resistance.
Car Parks & Multi-Storey Buildings: Hyperseal Expert 150 ensures long-term flexibility in expansion joints.

Civil Engineering & Infrastructure

Bridges & Tunnels: Arbokol AG2 Gun Grade is highly durable, making it ideal for structural expansion joints.
Runways & Pavements: Sikaflex PRO-3 Purform ensures long-term crack prevention.
Waterproofing of Basements & Retaining Walls: Using Expancell joint filler with compatible sealants prevents water ingress.

Submerged & Chemical-Resistant Applications

Water Tanks & Swimming Pools: Hyperseal Expert 150 is highly resistant to chemicals and submerged conditions.
Marine & Roadway Applications: Arbokol AG2 Gun Grade is designed for seawalls and heavily trafficked areas.

Supporting Accessories for Optimal Performance

To enhance the effectiveness of joint sealants, SDG supplies a range of complementary products:

Expancell Joint Filler: A closed-cell polyethylene filler that supports polyurethane and polysulphide sealants.
Expansion Cord: A polyethylene foam backer rod, ensuring proper joint depth and adhesion.
Arbokol AG2 Porous Surface Primer: Improves adhesion on concrete and porous substrates.

Why Choose SDG Joint Sealants?

✔ Certified Performance: Tested to ISO, ASTM, and EN standards.
✔ Full System Solutions: From primers and fillers to advanced sealants.
✔ Expert Guidance: Our technical team ensures you get the right product for your project.