OM Group supplies construction, pitching, soling, gabion and project-specific boulders across North and South Goa, with material selected against application, size and project requirements.
Boulder is a broad material category, not one standardized product. Select a type to jump to what it is, what it's used for and how it's sized.
Site works, foundations, embankments and heavy civil works.
Site development · Drainage · Retaining-related works ExploreQuarry stone for river-bank, guide-bank and embankment protection.
Slope protection · Erosion control · Riverbank works ExploreRoad and floor foundation, hardstanding and drainage preparation.
Road foundation · Floor foundation · Site preparation ExploreMesh-contained stone, sized against the project's gabion drawing.
Gabion structures · Drainage · Slope stabilisation ExploreRiprap and project-specific stone for erosion and retaining works.
Slope protection · Erosion control · Retaining-related works ExploreDifferent boulder requirements serve different construction purposes. Explore how construction, soling, pitching, gabion and protection stones are used across real project applications.
Used across site works, embankments and heavy civil applications.
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Quarry stone placed for riverbank and slope protection.
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Foundation-layer stone for road and site preparation.
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Mesh-contained stone for retaining and drainage structures.
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Slope, channel and retaining-related stone applications.
View ApplicationBoulder is a broad material category, not one universally standardized product. Unlike a graded aggregate or a specified sub-base, "boulder" describes a form — a large stone piece — rather than a single fixed size, shape or grading. The appropriate type, size, shape, weight, durability and source depend entirely on the application and the governing project specification.
A river-protection pitching stone, a gabion-basket fill stone and a road-soling stone answer to completely different requirements, even though all three are commonly called "boulders" in trade conversation. That distinction — not a one-line commodity listing — is the point of this page.
Construction boulders are used in site works, foundation-related works, embankments, drainage, retaining-related works and heavy civil works. This is an application/commercial classification rather than a single standardized grading.
Actual size and specification depend on the individual project — its design, layer thickness, construction method, structural requirement and site conditions. OM Group discusses the specific requirement with the buyer and coordinates appropriate material rather than quoting a fixed dimension in advance.
Example application — large stone placed by excavator for embankment and heavy civil works.
Pitching stone is used for river-bank protection, guide-bank protection, embankment protection, erosion control and slope protection. The general requirement is that pitching stone be sound, hard, durable and fairly regular in shape, with quarry stone specified for the work — stones subject to marked deterioration by water or weather are rejected.
Pitching stone is not simply "any big stone," and shape matters. Because quarry stone of regular shape is generally specified for pitching work, round river boulders are not automatically interchangeable with the stone a pitching drawing calls for — suitability depends on the project specification and drawing.
Size and weight are not fixed. For river-bank, guide-bank and embankment protection specifically, IRC:89 and IS codes (IS 8408, IS 10751, IS 12094, IS 14262) derive the required stone size and weight from the flow velocity the structure must resist, not from a standard table — the correct size depends on the hydraulic conditions and design for that structure. A filter media layer beneath the pitching, per the applicable filter grading requirement, is commonly specified to prevent loss of embankment material.
Example application — pitching stone hand-placed along a riverbank slope for erosion protection.
Soling is a construction method and application — road foundation, floor foundation, hardstanding and drainage preparation — rather than a universally standardized size. Actual size, shape and laying requirement depend on layer thickness, design, compaction and site conditions.
Soling and pitching are related but distinct: soling forms a foundation layer beneath a structure, while pitching is a protective surface layer against hydraulic forces. The two are specified differently and are not interchangeable terms.
Example application — soling stone laid as a highway foundation layer.
Soling stone at an industrial site, prepared ahead of foundation works.
Gabion stone is placed inside wire-mesh gabion baskets, filling from larger to smaller fragments with voids packed by hand to the designed slope. The critical sizing rule: individual stone pieces must not pass through the mesh opening.
Mesh size varies by project — one referenced project specification used a 10×12cm mesh, as an example of a real project requirement, not a universal standard. Gabion stone size is therefore determined by the specific mesh opening on the drawing, never by a fixed figure independent of the project.
Durability and weathering resistance matter because gabion stone is typically exposed in drainage, riverbank or slope-protection settings, and angularity generally aids interlock between pieces within the basket.
Example application — gabion baskets being filled and closed on an infrastructure project.
Close view of stone-to-mesh sizing within a completed gabion structure.
"Retaining stone" is not one standardized product. Riprap and slope-protection stone (dumped, graded, angular), pitching stone (hand-placed, regular shape), gabion stone (mesh-contained) and structural retaining-wall systems are distinct approaches to the same broad problem — erosion and slope stability — and are not interchangeable terms.
Which one applies depends on the actual engineering design for the structure, not on the fact that all four involve large stone. OM Group discusses the application against the project drawing before confirming material.
Example application — a gabion-basket retaining structure supporting a hillside road cutting in an area prone to slope movement.
The examples below are gabion-basket retaining construction specifically — one method within the broader protection-and-retaining category, and the same wire-mesh principle covered in Gabion Stone above, applied here to slope and channel retention rather than a stand-alone gabion structure.
Retaining structure under construction along a hillside carriageway.
Retaining stone work in progress near a bridge embankment.
Completed stepped retaining structure alongside a roadway.
There is no universal boulder size that is correct for every application. Pitching and gabion sizing specifically are not arbitrary trade conventions — they follow from engineering calculation and project drawings, which is why this page does not publish a single size chart.
| Boulder Type | What Determines Size & Weight |
|---|---|
| Pitching / Protection | Hydraulic conditions and flow velocity the structure must resist, per IRC:89 and applicable IS codes, and the project's design calculation and drawing |
| Gabion | The specific mesh opening on the project's gabion drawing — stone must not pass through it |
| Soling | Layer thickness, foundation design, compaction requirement and site conditions |
| Construction | Intended use, project design and the individual project's specification |
This is the literal engineering basis for boulder selection, not a marketing simplification — and it's why OM Group's role is to help identify the correct requirement against your project rather than sell against a size chart that doesn't exist.
Resistance to breakdown under load and weathering, relevant to long-term stability across all applications.
Angular, regular or rounded geometry determines suitability — pitching requires regular shape, gabion favours angularity for interlock, and neither is universally "better."
Resistance to water, frost and wet-dry cycling, critical in exposed drainage and river work.
Project- and calculation-derived, not fixed — set by flow velocity for pitching or mesh opening for gabion.
The same stone can be right for one application and wrong for another — suitability is never assumed from the material name alone.
Test or source data where applicable, relevant to engineer and procurement acceptance on specification-led projects.
Uniform quality across a supplied quantity, relevant at project scale where variability affects placement and performance.
Material arriving against the confirmed schedule, coordinated as part of the supply relationship rather than left to chance.
No parameter above is claimed as a laboratory value for a specific consignment — this is the framework used to assess suitability, confirmed against the material actually supplied on request.
Boulders are large individual stone pieces used whole in specific applications; aggregates are processed particles classified by size and grading for concrete, asphalt and road base. Boulders can enter the aggregate production chain when crushed — see OM Group's 6mm, 10mm, 12.5mm and 20mm graded aggregate range.
40mm aggregate is a processed, graded size for engineering use; a boulder is generally much larger and often used whole, undressed. The two are not defined by one size threshold — they are different material forms produced for different purposes.
GSB is a graded granular pavement layer produced to a grading envelope; boulders are individual large stone pieces. A boulder is not GSB, though crushed boulder material can feed GSB production upstream.
WMM (Wet Mix Macadam) is a mechanically mixed, graded base-course material; boulders are raw large stone. The two serve completely different pavement functions and are not alternatives to each other.
Boulder is large stone; quarry dust is a fine crushing by-product. Unclassified quarry dust should not be substituted for a specified boulder product where the project requires larger durable stone — this is not a claim that quarry dust has no legitimate use, only that the two are not interchangeable.
Boulders provide mass, stability, erosion resistance and protection against hydraulic forces in applications where large, durable individual stone pieces are required rather than finely graded aggregate. This does not mean boulders serve every function in every application — the right boulder type, correctly sized against the project's engineering requirement, is what does the work. Used against the wrong application or an unspecified size, a boulder is simply a large stone, not a solution.
| Application | Typically Considered | Key Selection Factor |
|---|---|---|
| Slope / river protection | Pitching or protection stone | Size/weight per IRC:89/IS calculation against flow velocity |
| Gabion structures | Gabion stone | Sized against the specific mesh opening |
| Road / floor foundation | Soling boulders | Layer thickness, design, compaction |
| Site development | Construction boulders | Project-specific |
| Drainage | Application-specific stone with filter media | Filter grading requirement |
| Retaining structures | Project-specific stone | Structural design |
All applications above remain subject to the applicable project design and specification — this page is a technical reference, not a design substitute.
OM Group does not simply sell large stones. OM Group helps buyers identify the appropriate boulder type, size, shape and durability requirement for the intended project, then coordinates and supplies the required material.
Boulder price depends on boulder type, size, source, quantity, loading, transport distance, project location and specification. No fixed price is published — OM Group quotes against the specific requirement.
Construction, pitching, soling, gabion and protection/retaining stone under one professional supply relationship.
OM Group discusses the application and drawing before confirming material, rather than selling by appearance alone.
Supply coordinated across North Goa and South Goa from OM Group's operational bases.
Boulders sit alongside aggregates, GSB and Ready-Mix Concrete — multi-material requirements can be quoted together.
| Product | Boulders |
| Categories | Construction, Pitching, Soling, Gabion, Protection/Retaining |
| Sizing basis | Project-specific — application, drawing and, where applicable, engineering calculation |
| Applicable references (general, pitching/protection) | IRC:89; IS 8408, IS 10751, IS 12094, IS 14262 |
| Gabion sizing reference (general) | Individual stone must exceed the project's specified mesh opening |
| Supply area | North Goa and South Goa |
| Documentation | Available on request, depending on project requirement |
| Availability and lead time | Confirmed against project requirement |
General
A boulder is a large individual stone piece used in specific construction, civil, road, drainage, foundation and protection applications, where mass, durability, stability or hydraulic resistance is required rather than finely graded aggregate.
Construction boulders are used in site works, foundation-related works, embankments, drainage and heavy civil works. They are an application classification rather than one standardized size — actual size and specification are set by the individual project.
Boulders are large individual stone pieces used whole in specific applications. Aggregates are processed particles classified by size and grading for concrete, asphalt and road base. Boulders can enter the aggregate production chain when crushed.
40mm aggregate is a processed, graded size for engineering use. A boulder is generally much larger and often used whole, undressed. They are different material forms, not defined by one size threshold.
GSB is a graded granular pavement layer produced to a grading envelope. Boulders are individual large stone pieces. A boulder is not GSB, though crushed boulder material can feed GSB production.
WMM (Wet Mix Macadam) is a mechanically mixed, graded base-course material. Boulders are raw large stone. The two serve completely different pavement functions.
Pitching
Pitching boulders are stone used for river-bank, guide-bank and embankment protection, erosion control and slope protection — sound, hard, durable and fairly regular in shape, generally specified as quarry stone.
Pitching generally specifies quarry stone that is sound, hard, durable and fairly regular in shape. Stone subject to marked deterioration by water or weather is rejected.
There is no single universal pitching-boulder size. The required size and weight depend on the hydraulic conditions, flow velocity, project design and applicable requirements under IRC:89 and IS codes 8408, 10751, 12094 and 14262 for the specific structure — confirm against your project's engineering requirement and drawing.
Quarry stone of regular shape is generally specified for pitching work, so round river boulders are not automatically interchangeable. Suitability depends on the project's drawing and specification.
A filter media layer — sand, gravel or approved material, per the applicable filter grading requirement — is commonly placed beneath pitching to prevent loss of embankment material, subject to the project's specification.
Yes. River-bank protection is one of the primary applications for pitching stone, with size and weight determined by the flow velocity the structure must resist, per IRC:89 and applicable IS codes.
Soling
Soling stone is used in a construction method — road foundation, floor foundation, hardstanding and drainage preparation — rather than being one standardized product.
Soling is used for road foundations, floor foundations, hardstanding and drainage preparation, and general site preparation ahead of a structural layer.
Soling stone size is not fixed — it depends on layer thickness, design, compaction requirement and site conditions for the specific project.
No. Soling forms a foundation layer beneath a structure, while pitching is a protective surface layer against hydraulic forces. They are specified differently and are not interchangeable terms.
Gabion
Gabion stone is stone placed inside wire-mesh gabion baskets, filling from larger to smaller fragments with voids packed by hand to the designed slope.
Gabion stone size is determined by the mesh opening specified for the project — the stone must not pass through the mesh. Mesh sizes vary by project, so there is no universal gabion stone size.
Yes. Gabion stone is part of OM Group's boulder range, sized against the project's specified mesh opening and supplied across North and South Goa.
Suitability depends on the stone exceeding the specified mesh opening, plus durability and weathering resistance for typically exposed drainage, riverbank or slope-protection settings. Angularity generally aids interlock between pieces.
No. Gabion stone is mesh-contained and sized against a mesh opening; pitching stone is hand-placed and sized against hydraulic calculation. They are different, specified approaches.
Gabions are used in drainage, riverbank protection and slope-stabilisation structures, where mesh-contained stone provides a flexible, permeable protective mass.
Comparison & Technical
No. Boulder size is set by the application — hydraulic calculation for pitching, mesh opening for gabion, layer design for soling and project specification for construction boulders. There is no single universal size.
Hardness, durability, shape, weathering resistance, correct size for the application, and, where relevant, supporting documentation together determine boulder quality — not any single factor in isolation.
Yes. Shape determines suitability for pitching (regular shape generally required), gabion (angularity aids interlock) and riprap (dumped, graded material) — each application weighs shape differently.
No. Suitability is application-specific, not a universal ranking. Angularity aids interlock in gabion applications; pitching generally specifies regular quarry stone; neither shape is categorically superior across every use.
Durability is assessed against hardness, resistance to breakdown under load, and resistance to deterioration from water and weathering — stones subject to marked deterioration are rejected for exposed applications such as pitching and gabion work.
Procurement & Local
OM Group supplies construction, pitching, soling, gabion and protection/retaining boulders across North and South Goa. Request a quote on this page or contact OM Group directly.
Yes. Pitching boulders are part of OM Group's boulder range, discussed against the project's drawing and hydraulic requirement before supply.
Yes. Soling boulders are supplied for road foundation, floor foundation and hardstanding work, matched to the project's layer design.
Yes. Construction, pitching, soling, gabion and protection/retaining boulders can be quoted and coordinated together on a single procurement relationship, alongside aggregates, GSB and Ready-Mix Concrete.
Yes. OM Group supplies boulders at project volumes across North and South Goa. Share the boulder type, quantity, delivery location and timeline for a bulk quotation.
Boulder price depends on type, size, source, quantity, loading, transport distance and specification. There is no fixed published rate — share your requirement with OM Group for current pricing.
Use the Request a Quote form on this page with boulder type, application, quantity, delivery location and timeline, or contact OM Group directly by phone or WhatsApp.
Boulder type, application, quantity and unit, delivery location, required size/weight or project specification, and delivery timeline — the more of this you can share upfront, the more accurate the quotation.
Yes. OM Group supplies boulders across both North Goa and South Goa, coordinated from its operational bases in each district.
Share your application, required quantity, project location and specification. OM Group can help you identify the appropriate boulder category and coordinate supply against the project requirement.