Product Overview
EcoMortar® Finish F3.5 is a dry, ready-mix lime plaster crafted with Saint-Astier® Natural Hydraulic Lime NHL 3.5. Designed as the final stucco coat in exterior lime render systems, it delivers outstanding adhesion, breathability, and flexibility — all without cement or artificial additives. EcoMortar® Finish F3.5 This finish coat offers enhanced strength and weather resistance, making it ideal for everything from historic restoration to high-performance modern exteriors. When applied over EcoMortar® Base, it completes a fully natural, breathable stucco system that’s built to last and made to impress.
It’s what your walls wear when they’re ready to stand out.
Key Benefits
● High Compressive Strength: Achieves up to 3.6 N/mm² after 90 days, ensuring long-lasting durability.
● Vapour Permeable: Facilitates moisture movement, reducing the risk of trapped moisture and associated damage.
● Cement-Free Composition: Composed solely of natural hydraulic lime, ensuring compatibility with historic masonry and sustainable building practices.
● Enhanced Elasticity: Offers superior flexibility compared to cementitious products, accommodating minor structural movements.
● Environmentally Friendly: Produced with lower energy than cementitious mixes and contributes to CO₂ re-absorption during curing.
● Contains Zero VOC
Recommended Applications
● Finishing Coat for External Lime Renders: Provides a durable and breathable top layer in lime render systems.
● Restoration Projects: Ideal for use in the conservation of historic buildings requiring breathable and compatible materials.
● Eco-Friendly Construction: Designed as the final stucco finishing coat for sustainable new builds and natural wall systems.
Packaging and Storage
● Available Sizes: 77 lb bags
● Shelf Life: 12 months from the production date when stored in dry conditions and in original packaging.
● Storage: Keep in a dry, cool place to maintain product integrity.
Composition
● Binder: Saint-Astier® Natural Hydraulic Lime NHL 3.5
● Aggregates: Well-graded fine sands
● Additives: Natural additives to enhance workability and curing
Application Guidelines
MIXING SECTION
Mix for 4 to 5 minutes with a whisk mixer (450 to 500 rpm). High-speed mixers (more than 500 rpm) are not recommended as they can over-mix the product and modify its performance. Manual mixing is not recommended.
WATER ADDITION
EcoMortar Finish requires approximately 1.3 – 1.7 gallons (167-217 fl. oz.) of water per 35kg (77lb) bag, depending on desired workability and application type. Add water gradually until desired consistency is achieved.
CONSUMPTION / COVERAGE
Finish Coat: Approximately 80-105 sq. ft. per coat at 3-5mm (1/8″-1/5″) thickness, depending on surface porosity and texture. When used as a finishing coat, make sure that the base coat is leveled, dry and sufficiently hardened to accept the finishing coat. For uneven or exposed surfaces, multiple coats may be necessary, allowing each layer to firm up before the next.
Renders: Approx. 0.83 lbs per sq. ft at 1/8″ thickness, depending on substrate and application method.
Pointing Coverage: (for joints approx. 3/8″ wide x 3/4″ deep) Up to 365 linear feet per 35kg (77lb) bag.
APPLICATION NOTES
Apply only to fully cured, clean, and dampened substrates. Do not apply over frozen surfaces or in direct sun on hot days. Substrate should provide adequate mechanical keying (e.g., open texture or light scored surface). Apply at a thickness of 3-5mm (approximately 1/8″ to 1/5″). For thicker applications, use multiple passes, allowing each coat to partially set before the next. When applying over EcoMortar® Base, allow the base to cure for at least 5 to 7 days. Lightly mist the surface 20 minutes prior to applying EcoMortar® Finish. For masonry pointing applications, ensure joints are clean, free of dust or debris, and lightly dampened before applying the mortar. Protect fresh work from wind, direct sun, freezing temperatures, and rain during initial curing. Cure times may vary depending on temperature, humidity, and substrate conditions.
WORKING TEMPERATURE
Apply between 8°C and 30°C (46°F to 86°F). Lightly dampen substrates before application. Avoid rapid drying from heat or wind; cure gently with water misting if needed. Protect fresh mortar from frost and drying winds for at least 10 days after application. Seal opened bags immediately after use. On hot or windy days, lightly mist the surface every few hours for the first couple of days to prevent premature drying.
TOOLS & CLEAN-UP
Apply using a steel trowel or plastering float. Clean tools with water before material hardens.
Technical Specifications
| Property |
Value |
| Dry Bulk Density |
1400 kg/m³ |
| Compressive Strength |
7 days: 1.2 N/mm²
28 days: 1.9 N/mm²
90 days: 3.6 N/mm² |
| Elasticity Modulus |
5000 MPa |
| Vapour Permeability |
0.85 g/m²·h·mmHg |
| Capillarity |
Type C and F |
| Maximum Grain Size |
EF: 0.8 mm
TF: 1.3 mm
F: 1.8 mm
M: 2.5 mm |
Note: “EF” refers to the Extra Fine granulometry, “TF” to the Thin Fine, “F” to Fine, and “M” to Medium.
