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20-40mm Roofing Pebbles
20-40mm Roofing Pebbles - Available Online in Bulk Bags or Loose by the Tonne with Nationwide Delivery
20-40mm Roofing Pebbles
20-40mm Roofing Pebbles - Available Online in Bulk Bags or Loose by the Tonne with Nationwide Delivery
In stock
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 850kg Bulk Bags including delivery including delivery from |
 Loose Tonnes Obtain a bespoke quote for loose delivery |
 500g Sample including delivery including delivery from |
20-40mm Roofing Pebbles is available to buy in increments of 1
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How to measure?
Take a metric tape measure and measure the length, width and depth of the area to be filled. The length and width measurements should be recorded in metres and the depth in millimetres. Now take these figures and enter them into the quantity calculator to reveal the approximate quantity required for your job.
Remember:
1 metre is equivalent to 1000mm or 100cm
1 centimetre is equivalent to 10mm
20-40mm Roofing Pebbles Consist of:
Naturally rounded 20-40mm Roofing Pebbles shaped over thousands of years by aquatic erosion. These pebbles are ideally suited for use in green roof systems, providing effective protection for underlying membranes against sun exposure, hail, and general weathering. In addition to their protective qualities, they serve an essential role in ballasting flat roofs to resist wind uplift and facilitate efficient drainage. Mainland Aggregates Ltd pride ourselves on being one of the leading suppliers of 20-40mm Roofing Pebbles in the UK.
Ideal for:
Green roof systems, general drainage,
Availability:
Loose or Bulk Bags
Minimum Order Quantity:
10 Tonnes Loose or 1 Bulk Bag
Coverage:
1 x Bulk Bag will cover approx 10sqm at 50mm depth
Bag Weights:
850kg per bag
Stone Density:
Approx 1.7 tonnes per cubic metre.
Fish Friendly?
Yes
Frequently Asked Questions
What Are 20-40mm Roofing Pebbles?
20-40mm Roofing Pebbles are a washed and graded pebble specifically chosen for their smooth and rounded properties.
What Can 20-40mm Roofing Pebbles Be Used For?
Roofing Pebbles are designed for use on flat roofing systems as ballast to prevent uplift during windy conditions also to protect underlying membranes from UV damage. Roofing Pebbles are also excellent in assisting drainage and act as a natural fire barrier.
How Do I Calculate The Quantity Of 20-40mm Roofing Pebbles I Require?
20-40mm Roofing Pebbles should be laid at 50-75mm depth and may require calculations by a structural engineer. Typically, one of our Bulk Bags will cover 10m2 at 40-50mm depth. For larger areas you may wish to use our quantity calculator located at the top right hand side of this page under the grey "How Much Will I Need" tab. Simply enter your measurements to reveal the required tonnage. Please be sure to enter the length and width figures in metres and the depth in millimetres to give the correct quantity.
How Do I Install 20-40mm Roofing Pebbles?
20-40mm Roofing Pebbles can be spread at 50-75mm directly onto a suitable membrane. For larger projects, a crane is often used to lift bags into position where they can be easily cut open and the contents spread. Smaller projects may be more labour intensive requiring an old-fashioned bucket and ladder approach.
Do 20-40mm Roofing Pebbles Require Maintenance?
20-40mm Roofing Pebbles should be trouble free! They may require periodic raking to remove leaves but nothing more than that. The product can even be power washed to remove heavier grimy deposits, but we recommend doing this during the drier summer months to avoid waterlogging.
Why Can't I Just Use Normal Garden Gravel Instead of 20-40mm Roofing Pebbles?
It is essential that the Roofing Pebbles used are free from sharp edges to prevent damage to delicate membranes. Standard Gravels will have an element of sharp/angular material and thus are not suitable.
Where Can I Buy 20-40mm Roofing Pebbles?
20-40mm Roofing Pebbles can be purchased right here! Bulk Bags can be purchased at the top right hand corner of this page. Simply enter the delivery postcode and the delivered price will be shown. You can then add the item to the shopping cart and complete the checkout process where you will be offered our available delivery dates. Larger loose orders of 10 tonnes or more will require a bespoke quote to enable us to apply any bulk discounts. A quote request can also be submitted at the top right hand corner of this page. Deliveries are usually made within 3-5 working days.
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