Riven Grey Slate Hearth – Standard Rectangle Cut to Size
Riven Grey Slate Hearth – Standard Rectangle Cut to Size - 20mm / Up to - 90cm x 60cm - (XS) is backordered and will ship as soon as it is back in stock.
Related Products
Express Riven Grey Slate Hearths
Need a Slate Grey hearth in a hurry? Our Express Riven hearths are produced from premium slate and delivered in as little as 3 working days. With speedy turnarounds, they’re ideal for last-minute installations, project changes or when another supplier has let you down.
Each hearth is cut to order in simple square or rectangular formats, using CAD-guided machinery for accurate sizing and clean, straight edges. The natural riven texture and soft grey tones make this slate a versatile choice, working perfectly in both contemporary and traditional homes
Supplied unsealed with clean sawn edges, they are ready for you to seal, enhance or trim on site as needed, giving plenty of flexibility at the point of installation.
For a full understanding of the material’s natural features and technical performance, please refer to the Specification tab where all key product details are listed in detail.
Easy Ordering Process
- ✓ Select your preferred thickness — 20mm or 30mm
- ✓ Choose the base size closest to your required dimensions from the dropdown
- ✓ Enter your cut-to-size measurements — we’ll handle the rest
Key Features
- ✓ Square or rectangular only for fast, efficient processing
- ✓ Precision cut to your requested size
- ✓ Clean sawn edges – supplied unsealed
- ✓ Fast 3-day delivery available across the UK
- ✓ No hidden costs or unexpected delays
- ✓ Ideal for on-site trimming or DIY fitting
If you require a more complex shape, angled cuts or a detailed edge profile, please explore our Bespoke Cut-to-Size Grey Slate service.
| Product Specifications | |
|---|---|
| General | |
| Product Name | Brazilian Grey Slate – Riven Hearth Grade |
| Material Type | Natural slate (metamorphic rock) |
| Category | Fire hearth slab / fireplace stone |
| Country of Origin | Brazil |
| Thickness Options | 20mm + 30mm, |
| Colour Description | Mid- to dark grey base with subtle blue-grey and charcoal tones, plus occasional softer greenish or graphite shading. |
| Surface Finish | Riven natural split finish with gently texture; smooth and textured areas will vary between pieces. |
| Edge Finishing Notes | All edges are precision machine-cut and then hand-sanded if needed. Due to the natural structure of slate sanding marks, slight tonal variations along the edges and occasional tiny micro-chips may be visible. |
| Natural Variation | Medium to high variation in tone, shading and riven height, typical of slate. |
| Weight | Approx. 70–140 kg per m² depending on thickness. |
| Density | Approx. 2,700–2,800 kg per m³. |
| Technical Characteristics | |
| Heat Absorption / Retention | Good thermal mass, absorbing heat efficiently and releasing it steadily. |
| Maximum Temperature Resistance | Typically performs safely up to approx. 450–500 °C before risk of thermal shock. Hearth must not be in direct contact with an open flame. |
| Compressive Strength | Approx. 200–280 MPa |
| Flexural Strength | Approx. 45–60 MPa. |
| Porosity | Low to medium. |
| Water Absorption | Approx. 0.2–0.6% (low water absorption typical of Brazilian slate). |
| Thermal Conductivity | Approx. 2.0–2.5 W/mK. |
| Chemical Sensitivity | Generally resistant to weak household acids; prolonged contact with strong acids may cause surface lightening or dulling. |
| Stain Resistance | Moderate in its natural state — significantly improved with a suitable penetrating or enhancing sealer. |
| Salt Sensitivity | Low; Brazilian slate is naturally dense and resistant to salt-related deterioration. |
| Natural Characteristics of Brazilian Grey Slate | |
| General Nature of the Stone | Brazilian grey slate is a natural metamorphic stone that splits along cleft layers to form its riven surface. This process creates natural height variation, subtle undulations and occasional more pronounced ridges. Differences in texture, tone and shading are expected and form part of the stone’s authentic character. |
| Colour Profile – “Grey Slate” | Sold as “grey slate,” this material typically shows a range from mid- to dark grey with blue-grey and charcoal notes. Some pieces may exhibit gentle greenish or graphite undertones. It is not a flat, single-tone grey; instead, soft tonal shifts and natural movement create a more organic, layered appearance. |
| Colour Patches & Mineral Movement | Natural mineral distribution within the slate can create lighter and darker areas, cloudy patches or subtle streaking across the surface. These features are not faults and do not affect performance, they are part of what gives each hearth its unique, natural look. |
| Riven Surface Texture | The riven finish is created when the stone is split along its natural cleft. No two hearths will be identical. Some faces will be relatively smooth with gentle ripples, while others may display more pronounced cleft lines or localised ridges. This variation is characteristic of genuine riven slate and contributes to its rustic appeal. |
| Pyrite / Fools Gold | Pyrite may occur as small metallic gold or bronze specks within the stone. It is a naturally occurring mineral and can also appear on cut edges where internal deposits are exposed. Isolated pyrite spots are not considered defects and do not affect the structural integrity of the hearth. |
| Production Enhancements | Where necessary, we may use epoxy fillers, localised smoothing, edge refinement or colour-enhancing treatments to improve the final appearance and consistency of the hearth. These are normal parts of our finishing process and are not regarded as faults or indicators of a lower-grade material. |
| Application & Packaging | |
| Suitable For | Fire hearths, stove bases, fireplace hearths, chamber floors, inglenooks and internal stone features. |
| Application | Internal use. |
| Sealing | Sealing is strongly recommended to help reduce marking, enhance the natural colour and improve resistance to staining and everyday spills. |
| Installation Notes | Install on a stable, level and load-bearing substrate. Allow for movement due to temperature changes. The hearth should not be in direct contact with open flame. Always use adhesives, grouts and sealers suitable for natural stone. |
| Packaging | Supplied on wooden pallets or in wooden crates with appropriate protective layers to minimise the risk of damage during transit. |
| Availability | Cut-to-size hearths available in 20mm and 30mm thicknesses, subject to order requirements and current stock levels. |
At Primethorpe Paving, we strive to provide clear and straightforward delivery options to make your shopping experience seamless and transparent.
Below is a detailed breakdown of our delivery services.
Free Delivery*
Eligibility: Available on orders of £750 or more — this can include a single item or a combination of any products on our website.
Timeframe: 3–5 business days (exact delivery date provided at checkout)
Details: Enjoy complimentary delivery with no hidden fees on all eligible orders of £750 or more.
Exclusion Postcodes: IV40–49, IV51–54, KW15–17, HS, PA20, ZE, PA21–38, PA41–49, PA60–78, KA27–28, PH42–44, PO30–41, IM, JE, GY, BT — These postcodes will be charged at a higher delivery cost, provided upon enquiry.
Standard Delivery (£65)
Cost: £65
Timeframe: 3–5 business days
Details: Available for all orders under £750. Reliable delivery within the stated timeframe.
Exclusion Postcodes: IV40–49, IV51–54, KW15–17, HS, PA20, ZE, PA21–38, PA41–49, PA60–78, KA27–28, PH42–44, PO30–41, IM, JE, GY, BT — These postcodes will be charged at a higher delivery cost, provided upon enquiry.
Express Delivery (Additional £30)
Cost: +£30 on top of Standard Delivery
Timeframe: 1–2 business days
Details: Ideal for urgent orders. Orders placed before 12 PM are processed and shipped the same day.
Note: For orders over £750, you can upgrade to Express Delivery for an additional £30.
Smaller Items Delivery (£10)
Items: Jointing compound, cement, sealer, slurry, etc.
Cost: £10 per item
Additional Cost: £10 per additional item (up to 6 items). After 6 items, a flat rate of £60 applies.
Recess Covers Delivery (£20)
Cost: £20 per item
Additional Cost: £20 per additional item (up to 3 items). After 3 items, a flat rate of £60 applies.
Installation Essentials with Paving Orders (Free)
Cost: Free
Details: When smaller items or installation essentials (e.g., jointing compound, recess covers) are ordered alongside paving, cobble, walling, coping, or hearth products — delivery for these items is free.
Samples Delivery (Free)
Cost: Free
Details: All sample orders qualify for free delivery.
Bespoke Made-to-Measure Items Details:
Bespoke or made-to-measure items may take longer to deliver due to their custom nature. However, you will always receive an exact delivery date at checkout, so you’ll know precisely when to expect your order.
Express Riven Grey Slate Hearths
Need a Slate Grey hearth in a hurry? Our Express Riven hearths are produced from premium slate and delivered in as little as 3 working days. With speedy turnarounds, they’re ideal for last-minute installations, project changes or when another supplier has let you down.
Each hearth is cut to order in simple square or rectangular formats, using CAD-guided machinery for accurate sizing and clean, straight edges. The natural riven texture and soft grey tones make this slate a versatile choice, working perfectly in both contemporary and traditional homes
Supplied unsealed with clean sawn edges, they are ready for you to seal, enhance or trim on site as needed, giving plenty of flexibility at the point of installation.
For a full understanding of the material’s natural features and technical performance, please refer to the Specification tab where all key product details are listed in detail.
Easy Ordering Process
- ✓ Select your preferred thickness — 20mm or 30mm
- ✓ Choose the base size closest to your required dimensions from the dropdown
- ✓ Enter your cut-to-size measurements — we’ll handle the rest
Key Features
- ✓ Square or rectangular only for fast, efficient processing
- ✓ Precision cut to your requested size
- ✓ Clean sawn edges – supplied unsealed
- ✓ Fast 3-day delivery available across the UK
- ✓ No hidden costs or unexpected delays
- ✓ Ideal for on-site trimming or DIY fitting
If you require a more complex shape, angled cuts or a detailed edge profile, please explore our Bespoke Cut-to-Size Grey Slate service.
| Product Specifications | |
|---|---|
| General | |
| Product Name | Brazilian Grey Slate – Riven Hearth Grade |
| Material Type | Natural slate (metamorphic rock) |
| Category | Fire hearth slab / fireplace stone |
| Country of Origin | Brazil |
| Thickness Options | 20mm + 30mm, |
| Colour Description | Mid- to dark grey base with subtle blue-grey and charcoal tones, plus occasional softer greenish or graphite shading. |
| Surface Finish | Riven natural split finish with gently texture; smooth and textured areas will vary between pieces. |
| Edge Finishing Notes | All edges are precision machine-cut and then hand-sanded if needed. Due to the natural structure of slate sanding marks, slight tonal variations along the edges and occasional tiny micro-chips may be visible. |
| Natural Variation | Medium to high variation in tone, shading and riven height, typical of slate. |
| Weight | Approx. 70–140 kg per m² depending on thickness. |
| Density | Approx. 2,700–2,800 kg per m³. |
| Technical Characteristics | |
| Heat Absorption / Retention | Good thermal mass, absorbing heat efficiently and releasing it steadily. |
| Maximum Temperature Resistance | Typically performs safely up to approx. 450–500 °C before risk of thermal shock. Hearth must not be in direct contact with an open flame. |
| Compressive Strength | Approx. 200–280 MPa |
| Flexural Strength | Approx. 45–60 MPa. |
| Porosity | Low to medium. |
| Water Absorption | Approx. 0.2–0.6% (low water absorption typical of Brazilian slate). |
| Thermal Conductivity | Approx. 2.0–2.5 W/mK. |
| Chemical Sensitivity | Generally resistant to weak household acids; prolonged contact with strong acids may cause surface lightening or dulling. |
| Stain Resistance | Moderate in its natural state — significantly improved with a suitable penetrating or enhancing sealer. |
| Salt Sensitivity | Low; Brazilian slate is naturally dense and resistant to salt-related deterioration. |
| Natural Characteristics of Brazilian Grey Slate | |
| General Nature of the Stone | Brazilian grey slate is a natural metamorphic stone that splits along cleft layers to form its riven surface. This process creates natural height variation, subtle undulations and occasional more pronounced ridges. Differences in texture, tone and shading are expected and form part of the stone’s authentic character. |
| Colour Profile – “Grey Slate” | Sold as “grey slate,” this material typically shows a range from mid- to dark grey with blue-grey and charcoal notes. Some pieces may exhibit gentle greenish or graphite undertones. It is not a flat, single-tone grey; instead, soft tonal shifts and natural movement create a more organic, layered appearance. |
| Colour Patches & Mineral Movement | Natural mineral distribution within the slate can create lighter and darker areas, cloudy patches or subtle streaking across the surface. These features are not faults and do not affect performance, they are part of what gives each hearth its unique, natural look. |
| Riven Surface Texture | The riven finish is created when the stone is split along its natural cleft. No two hearths will be identical. Some faces will be relatively smooth with gentle ripples, while others may display more pronounced cleft lines or localised ridges. This variation is characteristic of genuine riven slate and contributes to its rustic appeal. |
| Pyrite / Fools Gold | Pyrite may occur as small metallic gold or bronze specks within the stone. It is a naturally occurring mineral and can also appear on cut edges where internal deposits are exposed. Isolated pyrite spots are not considered defects and do not affect the structural integrity of the hearth. |
| Production Enhancements | Where necessary, we may use epoxy fillers, localised smoothing, edge refinement or colour-enhancing treatments to improve the final appearance and consistency of the hearth. These are normal parts of our finishing process and are not regarded as faults or indicators of a lower-grade material. |
| Application & Packaging | |
| Suitable For | Fire hearths, stove bases, fireplace hearths, chamber floors, inglenooks and internal stone features. |
| Application | Internal use. |
| Sealing | Sealing is strongly recommended to help reduce marking, enhance the natural colour and improve resistance to staining and everyday spills. |
| Installation Notes | Install on a stable, level and load-bearing substrate. Allow for movement due to temperature changes. The hearth should not be in direct contact with open flame. Always use adhesives, grouts and sealers suitable for natural stone. |
| Packaging | Supplied on wooden pallets or in wooden crates with appropriate protective layers to minimise the risk of damage during transit. |
| Availability | Cut-to-size hearths available in 20mm and 30mm thicknesses, subject to order requirements and current stock levels. |
At Primethorpe Paving, we strive to provide clear and straightforward delivery options to make your shopping experience seamless and transparent.
Below is a detailed breakdown of our delivery services.
Free Delivery*
Eligibility: Available on orders of £750 or more — this can include a single item or a combination of any products on our website.
Timeframe: 3–5 business days (exact delivery date provided at checkout)
Details: Enjoy complimentary delivery with no hidden fees on all eligible orders of £750 or more.
Exclusion Postcodes: IV40–49, IV51–54, KW15–17, HS, PA20, ZE, PA21–38, PA41–49, PA60–78, KA27–28, PH42–44, PO30–41, IM, JE, GY, BT — These postcodes will be charged at a higher delivery cost, provided upon enquiry.
Standard Delivery (£65)
Cost: £65
Timeframe: 3–5 business days
Details: Available for all orders under £750. Reliable delivery within the stated timeframe.
Exclusion Postcodes: IV40–49, IV51–54, KW15–17, HS, PA20, ZE, PA21–38, PA41–49, PA60–78, KA27–28, PH42–44, PO30–41, IM, JE, GY, BT — These postcodes will be charged at a higher delivery cost, provided upon enquiry.
Express Delivery (Additional £30)
Cost: +£30 on top of Standard Delivery
Timeframe: 1–2 business days
Details: Ideal for urgent orders. Orders placed before 12 PM are processed and shipped the same day.
Note: For orders over £750, you can upgrade to Express Delivery for an additional £30.
Smaller Items Delivery (£10)
Items: Jointing compound, cement, sealer, slurry, etc.
Cost: £10 per item
Additional Cost: £10 per additional item (up to 6 items). After 6 items, a flat rate of £60 applies.
Recess Covers Delivery (£20)
Cost: £20 per item
Additional Cost: £20 per additional item (up to 3 items). After 3 items, a flat rate of £60 applies.
Installation Essentials with Paving Orders (Free)
Cost: Free
Details: When smaller items or installation essentials (e.g., jointing compound, recess covers) are ordered alongside paving, cobble, walling, coping, or hearth products — delivery for these items is free.
Samples Delivery (Free)
Cost: Free
Details: All sample orders qualify for free delivery.
Bespoke Made-to-Measure Items Details:
Bespoke or made-to-measure items may take longer to deliver due to their custom nature. However, you will always receive an exact delivery date at checkout, so you’ll know precisely when to expect your order.
