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Structural Expansion Joints and Joint Sealants by EMSEAL

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1-800-526-8365 -- 508-836-0280 --  techinfo@emseal.com -- Fax: 508-836-0281
Last modified: August 27, 2008

Founded 1959.
In North America since 1979.

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SWRI

 27-year member: Sealant Waterproofing and Restoration Institute.  What is SWRI?


 

--The Evolution of Extruded Parking Deck Seals.pdf--
 

Technical Bulletins/
Knowledge Base:
1. Benchmarks for Performance of Precompressed Foam Sealants
2. Aggregate Loading
3. Buried Membranes
4. Collaborative 3D Design
5. Extruded Seal Evolution
6. Gaps In Air Barriers
7. GC's Role in EJ Success
8. Healthcare Joint Selection
9. Hybrid Sealants
10. Integral Nosing/Gland
11. Precured-Caulk&Backer
12. R-Value
13. Stadium Joints
14. Sound Attenuation
15. ADA & Spiked Heels
16. Snow Removal & Expansion Joints
17. FAQ-Frequently Asked Questions
18. The Common Law of Business Balance
19. Sealing Curved Expansion Joints

The Evolution of Extruded Parking-Deck Expansion Joint Seals

1. Compression Seal

Description:
• Multi-cell Neoprene extrusion installed into epoxy "lubricating adhesive" applied to joint face.

Advantages:
• Best technology available at its introduction shortly after World War II
• Predecessor of all modern extruded expansion joint seals

Limitations:
• Anchoring system reliant on adhesive in tension - weakest way to use adhesive
• Squeezes itself in and out of joints
• Limited movement: Max. joint size limited by relaxed width of seal. Min joint size limited by complex interior webbing.
• Compression set: loses ability to exert backpressure against substrate - substrate pulls away from seal
• Rigid "box" structure combined with poor anchoring system cannot handle vertical differential deflection (up and down) movement.
• Neoprene thermoplastic rubber extrusion cannot be heat-welded. Terminations and transitions in plane and direction as well as repairs must be glued. Glue dries out over time.

 2. Inflated Seal

Description:
 • Double or single barrier Neoprene thermoset rubber extrusion with joint face-applied epoxy "adhesive-in-tension" anchoring system
• Seal is inflated during installation to improve bond.

Evolutionary Advantages:
• Reduced interior webbing offers increased movement range over compression seal

Disadvantages:
• Anchoring system reliant on adhesive in tension - weakest way to use adhesive.
• Approx. 18 square inches of adhesive in tension per foot of joint.
• Bond line stressed by: peeling action during up and down vertical deflection; gravel and sand forced by tires into epoxy-to-seal interface; and standard tension from lateral movement
• Does not protect joint edge. Blockouts with elastomeric header required to waterproof joint edge and prevent cracking and spalling
• Durable terminations, transitions and repairs difficult. Neoprene thermoset rubber extrusion cannot be heat-welded. Terminations and transitions in plane and direction as well as repairs must be glued. Glue dries out over time.
• Poor extrusion tolerances of Neoprene yields excessive bulk at flexural nodes in gland, inhibiting movement and excessively stressing epoxy bond.
• Dependent on extremely smooth joint face. Relies on epoxy to fill irregularities.

3. Multi-Cell Blockout Adhered

Description
 • Blockout-anchored multi-cell extrusion with integral punched flanges encapsulated in elastomeric concrete nosing material.

Evolutionary Advantages:
• Superior anchoring system to compression seal and inflated seal.

• Elastomeric concrete nosing encapsulates punched flanges, mechanically anchoring seal using adhesive in shear - strongest way to use adhesive.

• Over 45 square inches of adhesive in shear per foot of seal.

• Not affected by minor irregularities in joint face.

Disadvantages:
• Limited movement. Max. joint size limited by relaxed width of seal. Min joint size limited by complex interior webbing.

• Rigid "box" structure inhibits vertical differential deflection (up and down) movement capabilities.

• When retrofitting joint-face adhered technologies, requires cutting of blockouts. In new construction, blockouts can be formed.

 4. Double Barrier Blockout Adhered

Description
 • Double-Barrier Santoprene thermoplastic rubber extrusion with integral punched flanges encapsulated in elastomeric concrete nosing material.

Evolutionary Advantages:
• Latest evolution of gland design. Combines high-movement of double barrier inflated seal with integral flanges for secure blockout mounting.

• Elastomeric concrete nosing encapsulates punched flanges, mechanically anchoring seal using adhesive in shear - strongest way to use adhesive.

• Weldabilty of Santoprene extrusion allows for continuous seal through changes in plane and direction and offers repairability.

• Over 45 square inches of adhesive in shear per foot of seal.

• Not affected by minor irregularities in joint face.

Disadvantages:
• When retrofitting joint-face adhered technologies, requires cutting of blockouts. In new construction, blockouts can be formed.

 
--The Evolution of Extruded Parking Deck Seals.pdf--
 

Expansion joints and precompressed joint sealants by EMSEAL

1-800-526-8365 -- 508-836-0280 --  techinfo@emseal.com -- Fax: 508-836-0281
 

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