S5 · Grid at the GSB/WMM interface, asphalt on top · Keep your asphalt
Keep your asphalt. Put the grid in the base and build thinner.
OC-LW 40 (OC-HD 40 for the heaviest traffic) laid at the GSB/WMM interface, aggregate-filled, with at least 100 mm of compacted WMM above it. The bituminous layers follow MoRTH and the client's specification: bituminous concrete, SMA, mastic asphalt, cold mix or a RAP mix. Nothing changes above the grid.
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OC-LW 40 laid at the GSB/WMM interface and filled with the same aggregate; WMM, DBM and BC above it exactly as MoRTH specifies
Why it wins
- The base gets twice as stiff. Modulus improvement factor 2.00 on a CBR 5% subgrade, 1.63 on CBR 10%, from large-scale tests at IIT Hyderabad.
- So the layers get thinner. In the IIT Hyderabad design examples, checked in IITPAVE to IRC:37: 14% thinner overall at 3.5 MSA, with 22–24% less bituminous and 11% less granular; 80 mm thinner at 50 MSA on CBR 5%.
- Nothing changes above the grid. Your contractor's asphalt scope, plant and crew stay the same; the grid adds one shift per 1,000 m².
- Weak subgrades. Where the granular base would otherwise be thick, the grid does the work of the extra aggregate.
Where it fits
Campus, township and approach roads · parking · plant peripheral roads · weak subgrades where the base would otherwise be thick.
Build-up
Choose S5 when
- The client or consultant keeps asphalt
- A thinner base, or a weak subgrade (tested at subgrade CBR 5–10%)
- The same asphalt contractor builds it
Not ideal when
- Asphalt is not required: S1 or S2 usually costs less
- Subgrade CBR outside 5–10% without engineering verification
What we need from you
- Area: length × width, or m²
- Location: city or a map pin
- Heaviest vehicle and vehicles a day
- Soil CBR if you have it, or the soil type
- The finish you want
- A site photo or layout drawing
Datasheet
| Installed range | Application time | Test data | Product | Product price, for procurement | Reference |
|---|---|---|---|---|---|
| Design-specific; ₹251 / sq ft (₹2,700 / m²) materials in a 10,000 m² example; 14% below the conventional section* | Contractor's schedule; grid adds one shift per 1,000 m²; asphalt opens as it always does | MIF 2.00 at CBR 5%, 1.63 at CBR 10%: IIT Hyderabad large-scale tank tests, October 2025 · presented at TGS2026, IISc Bengaluru, for publication by Springer | OC-LW 40 · OC-HD 40 for the heaviest traffic · 100% recycled PP | ₹51–64 / sq ft (₹550–690 / m²) OC-LW 40 · ₹84–107 / sq ft (₹900–1,150 / m²) OC-HD 40 by order size, ex-works · ex-GST · ex-freight | Orxa Energies, Bengaluru campus road · IIT Hyderabad test sections |
*Installed cost varies with local material availability, labour, transport, base design and site conditions; every site is priced from its own design. Product prices exclude GST (18%) and logistics.
On site
Installation at a glance
The six steps, what you need and when it opens, on one page. The installation guide comes by email on request; the SOP, the hold-point checklists and the method statement for your site come with your order. We train your contractor’s team: on site for up to 3 days for orders of 2,000 m² or more once the site is confirmed ready, online at no extra cost below that; on-site training is built into the product rate (one PO).
Test reports
Bureau Veritas and Stedrant load tests, GreenPro, patent 398992, IIT Hyderabad research. See Engineering.
Drainage and terrain
Designs are customised to geography, rainfall intensity and topography: sub-surface drains sized to the rainfall class, cross-sections for plain and steep terrain.
What would your road or yard cost on GridMats?
An indicative estimate in about a minute, free. Our engineers follow with the design and the bill of quantities against your conventional section; the method statement your contractor will follow comes with your order.
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