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When construction joints demand a sealant that moves reliably with the structure, adapts to various conditions, and delivers consistent results, the choice becomes clear. This product handles facade movement, concrete joint sealing, and general perimeter work with an elastic, durable finish, ensuring joints remain sealed and performing as intended for the long term. Contractors get a straightforward, high-performance sealant that integrates smoothly into diverse projects.
Sikaflex Construction AP is a 1-component, moisture-curing polyurethane sealant designed for the demanding conditions of general construction. It delivers a highly elastic, flexible, and robust seal for movement and connection joints on porous substrates. Formulated for both indoor and outdoor use, this product provides a non-corrosive, weather-resistant solution that can be painted over to match existing finishes.
Sikaflex Construction AP arrives ready to use, requiring no mixing, which simplifies application. The tooling time of approximately 160 minutes and skinning time of 180 minutes provide an ample working window for precise joint finishing, even across longer runs. For optimal results, ensure the substrate is clean, dry, sound, and free from contaminants. For critical or high-performance applications, follow the specific priming instructions:
Always insert a closed-cell Adheseal backer rod to control sealant depth and prevent three-sided adhesion, ensuring the sealant can perform to its full movement capability. The cured sealant can be painted over with most conventional facade coating systems, though a compatibility test is recommended.
Sikaflex Construction AP is specifically formulated as a go-to choice for general construction sealing and movement joints with up to ±25% capability, particularly effective on porous substrates. For applications that demand a broader range of substrate adhesion, higher movement capacity, or very specific performance characteristics beyond general construction, consider alternative Sikaflex products like Sikaflex PRO. Choosing the right product ensures optimal performance for the specific demands of each project.
Sikaflex Construction AP is designed for movement and connection joints in construction, particularly on porous substrates. It accommodates joint widths from 10 mm to 40 mm with a recommended 2:1 width-to-depth ratio for optimal performance and durability.
Yes, it can be painted over with many conventional facade coating paint systems. For best results, allow the sealant to fully cure first. Note that non-flexible paint systems may crack due to the sealant's inherent elasticity and movement capability.
No, Sikaflex Construction AP is not recommended for use on natural stone. It is also not for use on bituminous substrates, natural rubber, EPDM, or materials that may bleed oils or plasticizers.
Sikaflex Construction AP offers a movement capability of ±25%, as tested to ISO 9047 and ASTM C 719 standards. This ensures the joint remains sealed even with significant structural movement.
| Application | Key benefit | Primary trades |
|---|---|---|
| Movement joints in concrete & masonry facades | Withstands ±25% joint movement, preventing cracking and water ingress. | Concrete contractors, facade installers, builders |
| General perimeter sealing on porous substrates | Provides reliable adhesion and durable weather resistance on common building materials. | General builders, renovators, maintenance crews |
| Vertical and soffit joint sealing up to 30 mm width | Non-sag properties ensure the sealant stays in place without slump during application. | Facade installers, mastic men, concrete repairers |
| Joints requiring over-painting for aesthetic finish | Compatible with many paint systems, allowing for a seamless, uniform surface appearance. | Painters, builders, facade specialists |
Ensure substrates are sound, dry, and free from dust, oil, grease, laitance, and loose coatings. Mechanically clean where necessary and repair damaged arrises.
Wire brush, grind, or grit blast to remove weak layers. Vacuum to remove dust.
Prime per substrate: porous (Primer-3 N), selected metals (Aktivator-205 ± Primer-3 N), PVC (Primer-215). Avoid puddling.
Insert closed-cell polyethylene backing rod to regulate sealant depth and provide a bond-breaker.
Target width:depth of 1:0.5 (≥8 mm depth; 8–40 mm width typical).
Target width:depth ~1:0.8 with robust edge preparation.
Cut nozzle to suit joint width. Gun sealant ensuring full sidewall contact and no air entrapment. Tool firmly for a dense surface.
Use a compatible, non-solvent tooling agent; avoid solvent-containing fluids.
Clean equipment immediately after use; cured material requires mechanical removal.
Sikaflex Construction AP is not classified as a hazardous substance or mixture. However, standard precautions should be followed.
Chemical-resistant, impervious gloves (butyl rubber/nitrile rubber recommended) and safety glasses are recommended. Inadequate ventilation may require respiratory protection.
Use adequate ventilation to prevent exposure to vapours. Local exhaust ventilation may be required in enclosed spaces.
Store in dry conditions, protected from direct sunlight, at temperatures between +5 °C and +25 °C. Shelf life is 12 months from production in original, unopened packaging. Dispose of waste via a licensed waste management company; do not contaminate waterways.
Proper surface preparation and priming are critical for ensuring optimal adhesion and long-term joint performance. Primers improve adhesion but are not a substitute for proper cleaning or surface strength.
Surface prep: Ensure the surface is clean, dry, sound, and free from oils, grease, dust, and loose particles.
Primer: Required. Apply Sika® Primer-3 N with a brush. Allow a flash-off time of 30 minutes to 8 hours before sealing.
Surface prep: Clean and degrease thoroughly. Surfaces must be dry and free from contaminants.
Primer: Optional. For critical applications, use Sika® Aktivator-205 wiped on with a clean towel. Allow a flash-off time of 15 minutes to 6 hours.
Surface prep: Clean and degrease thoroughly.
Primer: Required. First, pre-treat with Sika® Aktivator-205 (wiped on), then after flash-off, apply Sika® Primer-3 N with a brush. Allow 30 minutes to 8 hours flash-off before sealing.
Surface prep: Clean the surface to remove any contaminants.
Primer: Required. Apply Sika® Primer-215 with a brush. Allow a flash-off time of 30 minutes to 8 hours before sealing.
| Property | Value |
|---|---|
| Composition | Polyurethane |
| Packaging | 600 ml foil pack |
| Shelf Life | 12 months from production |
| Storage Conditions | Dry, protected from direct sunlight, +5 °C to +25 °C |
| Colour Options | Concrete Grey, Black, White |
| Density | 1.25 kg/l approx. |
| Shore A Hardness | 24 approx. (after 28 days) |
| Secant Tensile Modulus at 100% Elongation (23 °C) | 0.35 N/mm2 approx. |
| Secant Tensile Modulus at 100% Elongation (-20 °C) | 0.50 N/mm2 approx. |
| Tensile Strain at Break | 700% approx. |
| Movement Capability | ±25% (ISO 9047, ASTM C 719) |
| Elastic Recovery | 90% approx. |
| Tear Propagation Resistance | 5.0 N/mm approx. |
| Service Temperature | −40 °C to +70 °C |
| Joint Width Range | 10 mm to 40 mm |
| Recommended Width to Depth Ratio | 2:1 |
| Sag Flow | 0 mm (20 mm profile, 50 °C) |
| Ambient Air Temperature for Application | +5 °C to +40 °C (min. 3 °C above dew point) |
| Substrate Temperature for Application | +5 °C to +40 °C |
| Curing Rate | 3 mm/24 hours approx. (23 °C / 50% r.h.) |
| Skinning Time | 180 minutes approx. (23 °C / 50% r.h.) |
| Tooling Time | 160 minutes approx. (23 °C / 50% r.h.) |
| VOC Content | 3% w/w (SDS) |
Here are some common examples on where Sikaflex Construction AP+ used by our customers.
