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Sikaflex Construction AP+ is a one-component, non-sag polyurethane sealant for movement and connection joints in concrete, masonry and other compatible building materials. It accommodates ±25% joint movement to ASTM C 719 and is suited to internal and external façade and building-joint sealing.
Use it for correctly designed movement joints in concrete and masonry façades, precast concrete connections and compatible building perimeter joints. Its non-sag consistency suits vertical and soffit applications, including overhead joints up to 30 mm wide. For aluminium, stainless steel, galvanised steel, glazed tiles, PVC and other non-porous surfaces, follow the specified pretreatment and adhesion-testing guidance.
The cured sealant remains elastic over a service temperature range of −40°C to +70°C. At +23°C and 50% relative humidity, it has an approximate 100-minute tooling time, 120-minute skin time and 2 mm per 24 hours cure rate. Site temperatures and humidity affect these times.
Compatible water-based façade coatings can be applied after the sealant has fully cured, subject to testing. Rigid coatings may crack when the joint moves. Joint dimensions and backing-rod placement depend on whether the joint is in a façade or floor; use the full joint-design guidance rather than a universal width-to-depth ratio.
Do not use Sikaflex Construction AP+ on natural or reconstituted stone, bitumen, PE, PP, PTFE, natural rubber or EPDM, or for swimming-pool joints, permanent immersion or joints under water pressure. Keep alcohol-containing products away from uncured sealant. Confirm substrate preparation and priming for each project.
For substrate priming where specified, see Sika Primer-3 N.
What movement can Sikaflex Construction AP+ accommodate?
±25% joint movement, tested to ASTM C 719 and classified as ASTM C 920 Class 25.
Can I paint over it?
Yes, with compatible water-based coatings after the sealant has fully cured. Test compatibility and allow for movement; rigid paints can crack.
Can it be used around pools or in submerged joints?
No. Do not use it for swimming-pool joints, joints under water pressure or permanent immersion.
What joint width is it intended for?
Movement joints should generally be 8–40 mm wide, with the depth designed for façade or floor use. A connection joint with no movement may be narrower. Follow the joint-design requirements in the product instructions.
How long is the tooling window?
Approximately 100 minutes at +23°C and 50% relative humidity; actual working time varies with site conditions.
| Property | Value |
|---|---|
| Composition | Sika i-Cure® polyurethane |
| Shelf Life | 12 months from production |
| Storage Conditions | Dry, protected from direct sunlight, +5 °C to +25 °C |
| Density | 1.25 kg/l approx. |
| Secant Tensile Modulus at 60% Elongation (+23 °C) | 0.30 N/mm² |
| Shore A Hardness | ~35 (after 28 days, EN ISO 868) |
| Elongation | ~800% (tensile strain at break, ISO 37) |
| Movement Capability | ±25% (ASTM C 719; ASTM C 920 Class 25) |
| Elastic Recovery | ~70% (ISO 7389) |
| Tear Strength | ~6.0 N/mm (ISO 34-2) |
| Service Temperature | −40 °C to +70 °C |
| Joint Width | 8–40 mm for movement joints; non-movement connection joints may be narrower |
| Recommended Width to Depth Ratio | Façade 1:0.5; floor 1:0.80; minimum 8 mm depth (whichever gives greater depth) |
| Sag / Slump | 2 mm (20 mm profile at +50 °C, EN ISO 7390) |
| Ambient Temperature | +5 °C to +40 °C (min. 3 °C above dew point) |
| Substrate Temperature | +5 °C to +40 °C |
| Cure Rate | 2 mm/24 hours (at +23 °C, 50% r.h., CQP 049-2) |
| Skin Time | 120 minutes (at +23 °C, 50% r.h., CQP 019-1) |
| Tooling Time | 100 minutes (at +23 °C, 50% r.h., CQP 019-2) |
| VOC Content | 3% w/w (SDS) |
| VOC Content (Product Data Sheet) | 41 g/L (Green Building, August 2025) |
Here are some common examples on where Sikaflex Construction AP+ Polyurethane Sealant used by our customers.
