Deep-groove Rendering Mortar for Stone-Imitation Facades
Deep-groove Rendering Mortar by JOSME is a polymer-modified cementitious material blended with special cement, graded quartz sand aggregate and functional additives. It achieves CS III–CS IV compressive strength grade, with pull-off adhesion over 0.8 MPa and water retention rate above 95%. Developed for stone-imitation paint deep-groove facade construction, the material permits single-pass thick-layer troweling up to 10 mm, without drooping, cracking or edge distortion after molding.
What Problem Does It Solve?
After extensive groove carving, conventional rendering mortar often experiences drooping, surface cracking, and fuzzy groove margins. This product uses improved material structure design to address frequent on-site building errors.
Rendering using Deep Grooves The thixotropic characteristics of mortar are stable. It supports clean and tidy groove carving without material collapse during operation by maintaining a high yield stress under construction pressure. Throughout the building and curing phases, carved groove structures remain stable because built-in microfiber components lessen the plastic shrinkage of thick coating layers.
Key Technical Parameters
| Parameter |
Value / Standard |
| Compressive Strength |
CS III – CS IV (EN 998-1) |
| Pull-off Adhesion |
≥ 0.8 MPa (EN 1015-12) |
| Water Retention Rate |
> 95% |
| Max. Single-Pass Thickness |
≤ 10 mm |
| Linear Shrinkage |
< 0.1% (ASTM C596) |
| Open Time (Workability Window) |
60–90 minutes (ambient temperature dependent) |
| Freeze-Thaw Resistance |
≥ 50 cycles (mass loss and bond strength evaluated) |
| Packaging |
25 kg per bag |
| Storage Temperature |
5°C to 35°C |
| Storage Conditions |
Cool, dry place |
Deep-groove Rendering Mortar Advantages
Performance of Multi-Substrate Adhesion On concrete, masonry, and EPS insulation boards, the Deep-groove Rendering Mortar provides pull-off adhesion greater than 0.8 MPa.
Consistent Shrinkage Results for Thick-Layer Buildings Low elastic modulus adjusts to outside walls' seasonal thermal expansion and contraction.
Precise and Sturdy Groove Molding After pressure is released, the material exhibits a fixed forming condition and flexible workability under building tools.
External Weather Resistance Following complete curing, the mortar is resistant to temperature fluctuations, UV rays, and rain erosion.
Eco-Friendly Formula During construction and servicing cycles, no pollutants are released, and the whole formula is free of hazardous substances.
Typical Application Scenarios
This mortar may be used for any external wall project that calls for accurate ornamental groove features for stone-imitation finishing and thick-layer leveling.
Commercial and Residential Structures Suitable for deep-groove external stone-imitation construction of villas, office buildings, public buildings, and residential complexes.
Exterior Insulation and Finish Systems (EIFS): EPS and mineral wool insulation boards may be used to create deep grooves and textures that mimic stone, achieving the cosmetic impact of a stone façade without adding to the structural weight of the structure.
High-Rise Podiums and Commercial Facades: To provide layered architectural light and shadow effects, deep-groove geometric modeling of high-rise podium walls and commercial building facades is ideal.
Quality Control
JOSME implements three-stage quality management covering raw material incoming inspection, production process monitoring and finished product testing for every production batch.
Core testing items include adhesion test compliant with EN 1015-12 standard, shrinkage detection per ASTM C596 specification, and freeze-thaw resistance evaluation over 50 cycles. The product’s 60–90 minutes open time is strictly verified to ensure sufficient on-site carving time for construction teams. Batch sample retention is adopted to stabilize particle size distribution and overall performance of each order.
Ordering and Customization
We provide flexible ordering solutions for engineering bulk orders and conventional procurement for global B2B clients.
Standard Deep-groove Rendering Mortar support delivery within 2–3 working days; customized formula and private-label orders take 7–15 working days. We accept advance scheduling for large-volume project orders to reserve production capacity.
Available customized services include particle size adjustment, personalized packaging and private-label processing. All export orders adopt reinforced packaging to adapt to long-distance ocean transportation.
FAQ
Q1: Is the mortar stable after 10mm thick-layer deep-groove construction?
A1: The product supports single-pass construction up to 10mm. Internal fiber structure controls linear shrinkage below 0.1%, effectively avoiding cracking and shelling of grooved surfaces after curing.
Q2: What causes groove cracking and how to avoid it?
A2: Rapid water loss and substrate structural changes will lead to groove cracking. Applying primer before construction and avoiding direct sunlight operation can reduce such risks.
Q3: How long is the available time for groove carving?
A3: The effective construction window is 60–90 minutes, adjusted appropriately according to ambient temperature, which meets the on-site operation cycle for groove carving.
Q4: Can it be used for EIFS systems with EPS insulation boards?
A4: Yes. Its adhesion on EPS substrates meets standard requirements, applicable for deep-groove and stone-imitation texture construction of exterior insulation systems.
Q5: Is this product compliant with project environmental standards?
A5: The non-toxic formula produces no harmful emissions during construction and use, complying with environmental requirements for various building exterior wall projects.
Contact Us
For product parameter consultation, project scheme matching, sample application and customized order demands of Deep-groove Rendering Mortar, please contact our professional team via [email protected].
