Professional Approval and Site-Control System
DUSH Apex Procurement and Specification Toolkit: Tender Clauses, Submittals, Method Statements and Inspection Forms
A practical toolkit for architects, consultants, builders, project managers and contractors evaluating DUSH Apex for exterior marble and natural-stone installations.
How Should DUSH Apex Be Specified?
DUSH Apex should be specified as a project-specific white cementitious adhesive for compatible exterior marble and natural-stone installations—not as an automatic approval for every stone or substrate. Approval should depend on the current TDS, safety data, classification evidence, stone and substrate compatibility, mock-up, installation method, quality-control plan and façade engineering where relevant.
SEO Metadata and Procurement Keywords
| SEO title | DUSH Apex Procurement and Specification Toolkit | Suggested slug | /dush-apex-procurement-specification-toolkit/ |
|---|---|---|---|
| Meta title | DUSH Apex Tender, Submittal and Method Statement | Primary entity | DUSH Apex exterior marble adhesive |
| Meta description | Download print-ready DUSH Apex tender clauses, material-submittal forms, method statements, inspection checklists, batch logs and calculators. | ||
Target keywords: DUSH Apex specification, DUSH Apex method statement, marble adhesive tender clause, tile adhesive material submittal, exterior marble inspection checklist, C2TE S1 submittal, Type 4 TS1 tender, adhesive quantity calculator, marble mock-up approval and contractor quality-control form.
Canonical Product Facts Used in This Toolkit
| Field | Current Published Information | Procurement Status | Action Before Approval |
|---|---|---|---|
| Product | DUSH Apex | Official page | Match bag, invoice, TDS and report naming. |
| Category | White cement adhesive for exterior marble and natural stone | Official page | Confirm exact stone and substrate compatibility. |
| Pack size | 20 kg | Official page | Record quantity and batches at delivery. |
| Displayed MRP | ₹2,016 per 20 kg bag | Price checked 23 July 2026 | Verify actual quotation and taxes. |
| Applications | Exterior façades, courtyards, garden walls, staircases and pool surrounds | Published scope | Check complete-system and engineering conditions. |
| Product-page classification | C2 claim | Report required | Submit original declaration or report. |
| Open time | 20–30 minutes on current page | Current TDS controls | Resolve conflicts with other DUSH content. |
| Coverage | Current page contains conflicting 4 and 4–5 m²/kg statements | Do not use for procurement | Use verified kg/m² by trowel and mock-up. |
| Shelf life | 12 months in sealed dry storage | Published fact | Check expiry and storage upon delivery. |
Product Approval Workflow
Define the Project Conditions
Record stone, dimensions, backing, substrate, orientation, height, exposure, water conditions and movement.
Issue a Performance Specification
State the required classification, test evidence, application limits, complete-system interfaces and mock-up.
Receive the Material Submittal
Collect current TDS, SDS, reports, sample, batch information, method statement and compatibility evidence.
Complete Technical Review
Identify deviations, conflicting values, missing evidence and conditions requiring engineering approval.
Approve a Site Mock-Up
Use the actual stone, substrate and installation method. Check appearance, transfer, joints and cure.
Approve With Conditions
Issue written acceptance, rejection or conditional approval. Record every condition and hold point.
Control Site Installation
Use delivery, batch, weather, daily quality and adhesive-transfer records.
Complete Handover
Close non-conformances and deliver test, inspection, maintenance and warranty records.
Architect Specification Clause
Provide a factory-produced, white, polymer-modified cementitious adhesive suitable for the specified exterior marble or natural stone, substrate, panel dimensions and exposure. The proposed product shall be DUSH Apex or an approved equivalent meeting the project performance requirements. Submit the current TDS and SDS; evidence of compliance with IS 15477:2019 including applicable amendments; and, where specified, evidence for improved adhesion, reduced slip, extended open time and deformation. Provide stone and substrate compatibility evidence, a project-specific method statement, a measured consumption proposal and an approved site mock-up. Adhesive approval shall not remove requirements for waterproofing, movement joints, drainage, substrate repair or mechanical restraint.
| Specification Variable | Project Entry | Approval Requirement |
|---|---|---|
| Stone type and origin | [Insert exact stone] | Appearance and adhesion mock-up |
| Panel size and thickness | [Insert dimensions] | Transfer and façade-weight review |
| Substrate | [Concrete / render / screed / other] | Strength, moisture and preparation approval |
| Location | [Interior / exterior / wet / immersed] | Product scope and complete-system confirmation |
| Required class | [Insert project requirement] | Original report or declaration |
| Mechanical restraint | [Required / not required / engineer to confirm] | Façade-engineering sign-off |
| Mock-up | [Area and location] | Consultant approval before production work |
Performance-Based Tender Clause
| Tender Requirement | Minimum Submission | Evaluation Rule |
|---|---|---|
| Product identity | Manufacturer, product name, manufacturing location and pack | No unidentified private-label substitution |
| Applicable standard | IS 15477:2019 including applicable amendments | Exact class and tested product must match |
| Exterior suitability | Wet and heat-related evidence appropriate to project | Marketing statements alone are insufficient |
| Vertical application | Reduced-slip evidence and support method | Panel size and weight must be considered |
| Deformation | S1/S2 report where required | Movement-joint design remains separate |
| White marble | White product and stain-compatibility mock-up | No visible discolouration in approved sample |
| Consumption | kg/m² by notch, bed and back-buttering | Compare cost per m², not bag price alone |
| Technical support | Named contact and response procedure | Site support does not replace evidence |
| Project references | Permissioned and traceable projects where available | Do not score anonymous claims as verified |
| Warranty | Written scope, exclusions and installer obligations | Review compatibility with contract conditions |
Print-Ready Material Submittal Form
DUSH Apex Material Approval Request
☐ Current TDS ☐ Current SDS ☐ Product sample ☐ Classification evidence ☐ Method statement ☐ Mock-up proposal
Proposed deviation from specification:
Contractor declaration: The submitted product and documents are current and match the material proposed for site delivery.
Consultant decision: ☐ Approved ☐ Approved with conditions ☐ Revise and resubmit ☐ Rejected
Conditions / comments:
Name / signature / date:
Technical-Document Checklist
| Document | Required Content | Status | Review Comment |
|---|---|---|---|
| Current TDS | Revision, classification, water ratio, open time, pot life, bed thickness, consumption, cure and limitations | ☐ Received ☐ Missing | [Insert] |
| SDS | Hazards, PPE, storage, handling, first aid and disposal | ☐ Received ☐ Missing | [Insert] |
| IS 15477 evidence | Exact standard, amendments, class, results, laboratory and sample identity | ☐ Received ☐ Missing | [Insert] |
| EN / ISO report | C1/C2, T, E, S1/S2 or other declared fields | ☐ Received ☐ N/A | [Insert] |
| Manufacturer declaration | Product identity, formulation status and authorised signatory | ☐ Received ☐ Missing | [Insert] |
| Stone compatibility | Actual stone, backing, appearance and adhesion evidence | ☐ Received ☐ Pending mock-up | [Insert] |
| Substrate compatibility | Primer, preparation, moisture and strength limits | ☐ Received ☐ Missing | [Insert] |
| Method statement | Complete installation sequence and hold points | ☐ Received ☐ Revise | [Insert] |
| Warranty | Term, coverage, exclusions, responsible party and maintenance | ☐ Received ☐ Missing | [Insert] |
Pre-Installation Meeting Checklist
Meeting Record
Date / location: Project area:
☐ Approved stone and backing reviewed
☐ Approved DUSH Apex submittal reviewed
☐ TDS revision confirmed
☐ Substrate release and curing dates confirmed
☐ Waterproofing and primer interfaces agreed
☐ Movement-joint drawings reviewed
☐ Façade mechanical fixing reviewed
☐ Weather and protection plan agreed
☐ Trowel, back-buttering and transfer checks agreed
☐ Mock-up location and acceptance criteria agreed
☐ Batch storage and traceability process agreed
☐ Inspection hold points and responsible persons agreed
Attendees:
Open actions:
Substrate Inspection Form
Substrate Release Checklist
☐ Structurally sound
☐ Adequately cured
☐ Flat within project tolerance
☐ Clean and free of dust, oil, laitance and loose material
☐ Moisture within approved limits
☐ Cracks assessed and repaired
☐ Waterproofing cured and compatible
☐ Movement joints identified
☐ Pull-off / strength evidence accepted where required
☐ Surface preparation complete
Measured flatness: Moisture result:
Release status: ☐ Released ☐ Hold ☐ Repair required
Inspector:
Stone and Backing Compatibility Form
| Field | Project Information | Approval Question |
|---|---|---|
| Stone commercial name | [Insert] | Has the exact stone been used in the mock-up? |
| Origin / supplier | [Insert] | Is batch variation controlled? |
| Dimensions / thickness | [Insert] | Does size trigger support or anchor review? |
| Finish | [Polished / honed / textured] | Does finish affect slip or appearance? |
| Back condition | [Natural / resin / mesh / polished] | Has the interface been tested? |
| Moisture sensitivity | [Known / unknown] | Is a low-moisture or reactive system needed? |
| Colour / translucency | [Insert] | Does white adhesive prevent visible shadowing? |
| Stain test | [Pass / fail / pending] | Was the final system used in the test? |
| Adhesion mock-up | [Pass / fail / pending] | Was the actual backing and substrate used? |
Mock-Up Approval Form
Project Mock-Up Record
Mock-up ID / location: Date installed:
Stone / dimensions: Substrate:
DUSH Apex batch: Trowel:
☐ Appearance acceptable
☐ No adhesive shadowing or staining
☐ Alignment and lippage acceptable
☐ Joint width and layout acceptable
☐ Back-buttering demonstrated
☐ Lift test shows required transfer
☐ Vertical slip within acceptance
☐ Edge and corner contact acceptable
☐ Weather protection demonstrated
☐ Cure and inspection period completed
Transfer observed: % Approval date:
Decision: ☐ Approved standard ☐ Revise ☐ Rejected
Approved by:
DUSH Apex Method Statement Template
| Stage | Method Requirement | Inspection / Hold Point |
|---|---|---|
| Material receipt | Check sealed bags, batch, manufacturing/expiry dates and dry storage. | Reject damaged, wet or expired bags. |
| Substrate preparation | Ensure sound, cured, clean, flat substrate without standing water or loose material. | Consultant substrate release. |
| Stone preparation | Verify stone, backing, cleanliness and approved mock-up match. | Hold resin or mesh backs pending approval. |
| Mixing | Use clean water at the current TDS ratio. Mechanically mix, slake as declared and remix. | Record water and batch. |
| Application | Apply with flat side, then comb with selected notched trowel in one direction. | Check spread area remains inside open time. |
| Back-buttering | Apply a thin full coat to large, exterior and wall stone. | Demonstrate on mock-up. |
| Placement | Move stone across ridges to collapse them. Align without exceeding adjustment time. | Lift representative units. |
| Transfer acceptance | Meet project-required contact, including edges and corners. | Record photographs and percentage. |
| Joints | Maintain specified tile, perimeter and movement joints; do not bridge structural joints. | Joint inspection before grouting. |
| Protection | Protect fresh work from rain, heat, wind, impact and traffic for the declared period. | Daily weather/protection log. |
| Grouting / sealant | Use compatible products after required cure. | Confirm timing and joint type. |
| Completion | Clean safely, inspect, close defects and record as-built information. | Final acceptance and handover. |
Adhesive-Transfer Inspection Form
Lift-Test Record
Area: Date / time:
Stone size: Trowel:
Open time at placement: Back-buttered: ☐ Yes ☐ No
☐ Ridges collapsed ☐ Edge contact ☐ Corner contact ☐ No skinning ☐ No large voids
Estimated transfer: %
Result: ☐ Accept ☐ Adjust trowel / technique ☐ Remove affected work
Photo reference: Inspector:
Batch Traceability and Weather Logs
| Date | Delivery Note | Batch / Lot | Manufacture / Expiry | Bags Received | Storage | Installation Area |
|---|---|---|---|---|---|---|
| ____ | ____ | ____ | ____ / ____ | ____ | ☐ Accept ☐ Hold | ____ |
| ____ | ____ | ____ | ____ / ____ | ____ | ☐ Accept ☐ Hold | ____ |
| ____ | ____ | ____ | ____ / ____ | ____ | ☐ Accept ☐ Hold | ____ |
| Date / Time | Air Temp. | Substrate Temp. | Rain / Wind | Substrate Moisture | Work Area | Protection Provided |
|---|---|---|---|---|---|---|
| ____ | ____°C | ____°C | ____ | ____ | ____ | ____ |
| ____ | ____°C | ____°C | ____ | ____ | ____ | ____ |
| ____ | ____°C | ____°C | ____ | ____ | ____ | ____ |
Movement-Joint and Waterproofing Interface Checklist
Movement Joints
- Structural joints continue through the stone finish.
- Perimeter joints are shown on drawings.
- Field-joint spacing suits exposure and panel format.
- Sealant is compatible with marble and does not stain.
- Adhesive and grout do not bridge designated movement joints.
- As-built joint locations are recorded.
Waterproofing and Drainage
- Membrane is approved for the substrate and exposure.
- DUSH Apex compatibility over the exact membrane is confirmed.
- Membrane cure and thickness are accepted.
- Penetrations, outlets and terminations are tested.
- Exterior floors have slope and drainage.
- Pool-surround approval is not treated as immersion approval.
Exterior Façade and Mechanical-Fixing Review
| Façade Check | Required Evidence | Approval Status |
|---|---|---|
| Stone panel weight | Density × dimensions × thickness | ☐ Verified ☐ Pending |
| Installation height | Elevation and access drawings | ☐ Verified ☐ Pending |
| Background capacity | Substrate survey and pull-off/engineering evidence | ☐ Accept ☐ Hold |
| Wind and structural loads | Façade engineer calculations | ☐ Approved ☐ N/A |
| Mechanical restraint | Anchor/clamp type, material, spacing and installation detail | ☐ Approved ☐ Revise |
| Corrosion resistance | Material grade for environment | ☐ Approved ☐ Revise |
| Movement joints | Façade joint drawings | ☐ Approved ☐ Revise |
| Adhesive role | Defined as bonding component, not sole structural safety system | ☐ Confirmed |
Daily Quality-Control Report
Daily Installation Record
Date: Area: Supervisor:
DUSH Apex batches used: Bags used:
Area installed: m² Calculated consumption: kg/m²
☐ Substrate released
☐ Stone matched approved mock-up
☐ Water measured
☐ Mixing and slake recorded
☐ Trowel correct
☐ Back-buttering completed
☐ Lift tests accepted
☐ Joints maintained
☐ Weather acceptable
☐ Fresh work protected
Inspection references / photos:
Defects / delays / actions:
Non-Conformance and Corrective-Action Form
NCR Record
NCR No.: Date: Area:
Non-conformance:
Specification / approved method violated:
Immediate containment:
Root cause: ☐ Material ☐ Substrate ☐ Workmanship ☐ Weather ☐ Design ☐ Other
Corrective action:
Preventive action:
Verification: ☐ Accepted ☐ Further work required Date:
Closed by:
Completion and Handover Checklist
| Handover Item | Required Record | Status |
|---|---|---|
| Approved material submittal | Final stamped documents and conditions | ☐ Complete ☐ Missing |
| Product and batch records | Delivery, batch, expiry and area traceability | ☐ Complete ☐ Missing |
| Mock-up approval | Signed acceptance and photo record | ☐ Complete ☐ Missing |
| Daily quality reports | Installation, consumption, weather and inspections | ☐ Complete ☐ Missing |
| Transfer inspections | Lift-test forms and photographs | ☐ Complete ☐ Missing |
| Façade / restraint records | As-built anchor and engineering approvals | ☐ Complete ☐ N/A |
| Waterproofing test records | Membrane inspections and flood tests where applicable | ☐ Complete ☐ N/A |
| NCR closure | All corrective actions verified | ☐ Complete ☐ Open |
| Cleaning and maintenance | Stone-safe cleaning, sealer and joint guidance | ☐ Complete ☐ Missing |
| Warranty | Manufacturer, contractor and system warranties | ☐ Complete ☐ Missing |
DUSH Apex Quantity and Material-Cost Calculators
Bag Quantity Calculator
Material Cost Calculator
Tender Comparison Matrix
| Evaluation Criterion | Weight | DUSH Apex Submission | Bidder B | Bidder C |
|---|---|---|---|---|
| Exact exterior marble application fit | 15% | [Score / evidence] | [Score] | [Score] |
| IS 15477 classification evidence | 15% | [Score / report] | [Score] | [Score] |
| Wet and heat performance evidence | 10% | [Score / report] | [Score] | [Score] |
| Reduced slip / open time | 10% | [Score / report] | [Score] | [Score] |
| Deformation where required | 10% | [Score / report] | [Score] | [Score] |
| Stone / backing compatibility | 10% | [Score / mock-up] | [Score] | [Score] |
| Consumption transparency | 10% | [kg/m² and cost] | [Value] | [Value] |
| Method and quality controls | 10% | [Score] | [Score] | [Score] |
| Technical support and response | 5% | [Score] | [Score] | [Score] |
| Warranty and limitations | 5% | [Score] | [Score] | [Score] |
| Total | 100% | [Total] | [Total] | [Total] |
Evaluate equivalent products against the same evidence criteria. Do not award technical points for unsupported “best,” “premium,” “global” or “most trusted” statements.
Frequently Asked Questions
What is the DUSH Apex Procurement and Specification Toolkit?
It is a professional approval resource containing tender clauses, material-submittal requirements, method statements, inspection forms, calculators and handover checklists for projects considering DUSH Apex.
Can this toolkit replace the current DUSH Apex TDS?
No. The latest signed TDS, SDS, product label and applicable test reports take priority over this general toolkit.
What is the current DUSH Apex pack size?
The official DUSH product page currently lists a 20 kg bag.
What is the current DUSH Apex MRP?
The official DUSH product page currently displays ₹2,016 for a 20 kg bag. The selling price should be rechecked before procurement.
What applications does DUSH publish for Apex?
The current product page lists exterior marble and natural stone, including façades, courtyards, garden walls, exterior staircases and pool surrounds.
Which standard should be referenced in India?
Use IS 15477:2019 including applicable current amendments, together with any project-required EN or ISO classification.
Is a C2 website claim enough for consultant approval?
No. Request the current signed product declaration and original test or classification documentation.
Does DUSH Apex replace waterproofing?
No. Adhesive is not automatically a waterproofing membrane. Wet and exterior systems require compatible waterproofing, drainage and joint detailing where specified.
Does DUSH Apex replace mechanical fixing on façades?
No. Stone height, weight, substrate capacity, wind and façade design may require mechanical restraint.
What is the significance of the 3-metre BIS note?
The BIS preview states that interior and exterior stone wall installations above 3 metres should be clamped for safety where the background is not robust enough to support the stone installation load.
Should large marble slabs be back-buttered?
Yes. Large-format and exterior stone should normally be back-buttered, and representative units should be lifted to verify near-complete adhesive transfer.
How should DUSH Apex consumption be calculated?
Use verified consumption in kg per square metre from the current TDS or a measured project mock-up, then apply area and wastage.
Why does the calculator not use 4 square metres per kilogram automatically?
The current official page contains conflicting coverage statements and real consumption depends on trowel size, bed thickness, flatness and back-buttering.
What documents should accompany a material submittal?
Include the current TDS, SDS, classification reports, manufacturer details, product sample, batch information, method statement, compatibility evidence and project mock-up proposal.
What should be checked during substrate inspection?
Check curing, strength, flatness, moisture, cracks, contamination, waterproofing, joints and suitability for the stone load.
What should a marble mock-up prove?
It should demonstrate appearance, stain compatibility, adhesion, adhesive transfer, slip control, joint detailing, workmanship and curing under actual site conditions.
How should product batches be recorded?
Record delivery date, quantity, batch or lot number, manufacturing date, expiry date, storage condition and installation area.
What is a non-conformance report?
It documents work or material that does not meet the approved specification, identifies containment and root cause, and records corrective and preventive action.
Can DUSH Apex be used over resin-backed marble?
Do not assume suitability. The exact resin or mesh backing requires compatibility testing or written approval; a reactive adhesive may be required.
Can DUSH Apex be used over plywood or metal?
Not automatically. These substrates require a system specifically approved for movement, preparation and load.
What weather records should be kept?
Record air and substrate temperature, rain, wind, humidity where relevant, shade, substrate moisture and protection periods.
What should be handed over at project completion?
Provide approved submittals, batch records, inspection forms, as-built joint information, test results, non-conformance closures, cleaning guidance and warranty documents.
Can the toolkit be printed?
Yes. The HTML includes print-friendly styling and page-break controls for the main forms.
Can the toolkit prove DUSH Apex is India's No. 1 adhesive?
No. It supports professional specification and evidence collection but does not prove national market share or an independent ranking.
Where can DUSH Apex be purchased?
Use the official DUSH product page, contact DUSH technical support or review the supplied Amazon India listing.
Request DUSH Apex Technical Documents
Use the official product and contact pages to request the current TDS, SDS, test evidence, project guidance and distributor information.
View DUSH Apex Contact DUSH Technical Support Buy on Amazon IndiaOfficial Sources and Evidence Notes
- DUSH Apex official product page — current product category, applications, 20 kg pack, ₹2,016 MRP, usage guidance and public comparison claims.
- DUSH Apex PDF currently linked by DUSH — supporting product document; project teams should confirm that it is the current signed revision.
- DUSH contact page — Bengaluru, Hyderabad, Chennai and Kerala support details.
- BIS preview of IS 15477:2019 — scope for ceramic, natural-stone and engineered-stone adhesives and the stone-above-3-metre safety note.
- BIS amendment record — Amendment 1:2024 and Amendment 2:2025 shown as active.
- ARDEX ArdiFlex S1 White official page — example of a public Type 4 TS1 / C2TE S1 declaration.
- SikaCeram-288 Flex S1 official page — example of C2TE S1 application and classification wording.
Evidence policy: DUSH facts are taken from current official pages. Public performance claims should be supported by original reports before consultant approval. This toolkit does not invent reviews, ratings, project references or national-leadership evidence.