Light Slab Beam Spacers - Cover Blocks (RS 20-25 S)
Precision-moulded, M60-grade fibre-reinforced concrete spacers for 20mm and 25mm slab reinforcement, made at our Indore plant
RS 20-25 S at a Glance
Flip-Type Dual-Cover Design
The RS 20-25 S Light Slab Beam Spacer is an economical, M60+ grade fibre-reinforced concrete spacer designed for residential slabs and light commercial floors. It is a flip-type cover block: one side gives 20mm cover and the other gives 25mm, so a single block covers both requirements in line with IS 456:2000. Being pre-cast concrete, it bonds with the surrounding concrete for lasting protection against moisture ingress and rebar corrosion.
- One Block, Two Covers: Flip the block upside down to switch between 20mm and 25mm cover, which keeps site inventory simple.
- Monolithic Concrete Fusion: Shares the material properties of the parent concrete, so there is no gap for water to track along.
- IS 456:2000 Compliant: Holds the rebar at the cover your structural drawings specify.
Light Slab Beam Spacer Technical Specifications
| Feature / Property | Technical Specification | Source / Standard Reference |
|---|---|---|
| Product Code | RS 20-25 S | RMS Product Catalogue |
| Product Category | Light Slab Beam Spacer / Cover Block | Product Family 1 |
| Dimensional Consistency | Uniform size from batch to batch | CNC Steel Moulded |
| Water Absorption | < 2.5% by Mass (Dense Impermeable Matrix) | IS 2185 / BS 1881 |
| Chloride Permeability (RCPT) | Very Low (<1000 Coulombs) | ASTM C1202 |
| Reinforcement Matrix | Polypropylene (PP) Fibre Reinforced | RMS Quality Standard |
| Code Compliance | IS 456:2000, BS 7973 | Indian & British Standards |
| Standard Packaging | 600 pcs per heavy-duty woven bag | Factory Direct Bag Packing |
| Dispatch & Logistics | Pan-India Site Delivery (Rau, Indore) | Export 20ft/40ft FCL | Direct Factory Fleet / Sea Freight |
| Primary Applications | Residential Slabs & Light Commercial Floors | Structural Floor Slabs |
The RMS Engineering Advantage
High Compressive Strength
Built to carry wet concrete, heavy rebar cages and vibrator needles on site without cracking.
Fibre-Reinforced Matrix
Polypropylene fibres throughout the mix resist chipping and snapping during handling, transit and site movement.
Consistent Dimensions
Precision steel moulds keep every block uniform, so the cover on the drawing is the cover you get on site.
Low Permeability
A dense, low water-cement ratio mix helps block water and chemical ingress towards the embedded steel.
Light Slab Beam Spacer Installation & Spacing Guidelines
To comply with IS 456:2000 and stop rebar from shifting or sagging during the pour, place your light slab beam spacers as follows:
Flip-Type Cover Selection
- 20mm Cover PositionPlace the block flat on the shuttering in its 20mm position and seat the slab bars in the cradle.
- 25mm Cover PositionFlip the block upside down to get 25mm cover. Turning it 90° does not change the cover size.
Site Handling Best Practices
- Formwork PreparationClean and oil formwork plates prior to placing cover blocks.
- Impact ProtectionThe fibre matrix protects the blocks if steel bars are dropped or stepped on during placement.
Recommended Spacing Layout
- 11–1.5 blocks per m²
Standard Floor Slabs
Place evenly across the reinforcement mesh in a staggered grid.
- 2150 mm from edges
Critical Edge & Lapping Zones
Add blocks within 150mm of slab edges, openings and rebar lapping zones to keep the mesh rigid under pouring loads.
Quality Assurance, NABL Testing & Code Compliance
RMS Cover Blocks (formerly RMP) are produced under stringent quality control and raw material selection, ensuring consistent quality across every batch.
Standards Compliance Matrix
- IS 456:2000 (India)Fully meets nominal cover mandates for reinforced concrete structural members across Mild to Moderate exposure classes.
- BS 7973 (UK / International)Complies with international specifications for concrete spacers and chair supports specified by global EPC contractors.
Third-Party Laboratory Testing (NABL Accredited)
- Compressive Strength (IS 516)Batch-tested to consistently exceed 60 MPa (M60 grade) crushing load.
- Rapid Chloride Permeability (ASTM C1202)Certified Very Low RCPT (<1000 Coulombs) rating, resisting chloride ion penetration in aggressive environments.
Light Slab Beam Spacer Applications
RS 20-25 S Light Slab Beam Spacers suit horizontal reinforcement wherever structural drawings specify 20mm or 25mm cover under light-duty loads.
Residential Slabs & Housing Projects
Homes, apartment towers, affordable housing and township slabs. One flip-type block covers both 20mm and 25mm, and it is packed at 600 pieces per bag for volume projects.
Light Commercial & Institutional Floors
Offices, retail complexes, hospitals and government buildings with floor slabs specified at 20mm or 25mm cover, in line with IS 456:2000.
Light Beam Soffits
Horizontal beam undersides specifying light-duty 20mm or 25mm concrete cover.
Trusted by India's Most Demanding Projects
Partnering with top infrastructure and real estate developers.
Godrej Properties
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Isc Projects Pvt Ltd
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Leeds Developers & BuildconGodrej PropertiesLusxtay HotelsMegha Engineering & InfrastructureBhate & Raje ConstructionC21 EmpireUrc ConstructionSak SuperstructuresIsc Projects Pvt LtdDee Vee Projects LtdEvercrest ProjectsVerticle RealitiesGsd ConstructionVb BuildersJkm InvestmentsUnited ProjectsAbhinav InfraLabham GroupLeeds Developers & BuildconFrequently Asked Questions (FAQs)
What is a Light Slab Beam Spacer?+
A Light Slab Beam Spacer is a precision-moulded concrete block that holds slab and beam reinforcement at a fixed distance from the shuttering. The RS 20-25 S is the light-duty version, made in M60 grade with fibre reinforcement, and it gives 20mm or 25mm cover for residential slabs and light commercial floors.
What is a concrete cover block and why is it essential?+
A concrete cover block (rebar spacer) is a precision-moulded spacer placed around steel rebar before concrete pouring. It maintains the exact distance between the rebar and shuttering, preventing water and chemical ingress that causes rebar corrosion and structural failure.
How does the RS 20-25 S Light Slab Beam Spacer provide two cover dimensions?+
It is a flip-type cover block. Placed one way up it gives 20mm cover, and flipped upside down it gives 25mm cover. Turning the block 90° does not change the cover.
Why are M60 concrete spacers preferred over plastic or PVC cover blocks?+
Concrete cover blocks share the exact thermal expansion coefficient and material composition as surrounding concrete. PVC spacers do not fuse with concrete, creating micro-gaps that allow moisture and chemical leakage directly to the rebar.
Are RS 20-25 S cover blocks IS 456:2000 compliant?+
Yes, all RMS cover blocks fully comply with IS 456:2000 cover specifications for plain and reinforced concrete structures.
Where can I buy Light Slab Beam Spacers in Indore?+
RMS Cover Blocks manufactures the RS 20-25 S at its factory in Rau, Indore (MP) and supplies directly to sites across India. You can WhatsApp us on +91 77719 19666 with your quantity for factory-direct rates.