× National Flues
We Won't Be Beaten On Price.
Free Delivery on Orders Over £100
100% 5 Star Reviews on Trustpilot
Free Flue Design Service Available
Need Help? 01670 206999 (8am-5pm)

Firechests - 20kg bag Firebrick Mortar (59-130753)

At National Flues, our 20kg bag Firebrick Mortar is a superior choice for constructing robust and efficient Isokern firechests. Manufactured using premium pumice, this mortar not only ensures strong adhesion but also enhances the heat retention properties of your installation. Whether you are a trade professional or a discerning DIY enthusiast, our product and its complementary accessories offer the reliability and performance synonymous with the National Flues brand. Discover quality, safety, and efficiency with our firebrick mortar and explore a range of optional accessories to further optimise your fireplace setup.
Hover to Zoom / Click for Gallery
£60.49
Give us a call if you find it cheaper and we'll try to price match.

 

Payment Options

At a Glance

  • 20kg bag ensuring ample quantity per project
  • Specially formulated for strong firebrick adhesion
  • Utilises high-quality pumice for superior heat insulation
  • Compatible with Isokern firechests and Magnum variants
  • HETAS Approved and CE marked for quality assurance

Please Note: All dimensions refer to the internal diameter of flues. If unsure, please call 01670 206999 to ensure you choose the correct products.

We Won't Be Beaten On Price

At National Flues, we continuously monitor competitor prices. This ensures that we consistently offer you the best deals on all our products. Here’s how we keep your costs low:

  • Daily Price Matching: Our team adjusts prices to ensure we stay competitive.
  • Bulk Purchasing Power: We sell a lot, so we can negotiate better rates with suppliers, passing the savings directly to you.
  • Operational Efficiency: We have streamlined processes to reduce overhead.

Price Match Guarantee: If you find the same product cheaper within 48 hours, we’ll match it and refund the difference.

Free Delivery Over £100: Orders over £100 are free delivery (call us if delivery is required outside the mainland UK).

“I saved 20% on my purchase compared to other retailers. Exceptional service!” – Jane D.

Have Questions?
Phone: 01670 206999
Email: [email protected]

Our 20kg Bag of Firebrick Mortar is an essential component for constructing Isokern firechests. These firechests arrive as flat packs and are designed for easy assembly, culminating in a sleek, preformed fire opening ready for finishing. The Magnum Firechest variant allows for impressive fire openings up to 1.2 meters wide.What sets pumice apart, used in this construction, is its unique insulating properties.

It ensures that flue gases rapidly reach their optimal temperature, boosting the performance of your heating appliance soon after ignition. Moreover, it retains warmth longer as the appliance cools down, enhancing efficiency and minimizing condensation and soot accumulation.Isokern DM is both HETAS Approved and CE marked, with designation number Double Module DM System Chimney* T450 N1 D 3 G(00). For installation, please refer to our comprehensive guides available for seamless setup.

SKU: 59-130753

Technical Specifications
SKU59-130753
Product NameFirechests - 20kg bag Firebrick Mortar
Designation DM SystemEN1858 - T450 N1 D 3 G(00)
Designation Liner SystemEN1857 - T600 N2 D 3 G
Warranty10 Years
MaterialPumice
Distance To Combustibles0 on straights; 38mm on offsets on DM System
• Ensure you follow our comprehensive installation guides meticulously for safe assembly. • Verify all components are in place before beginning the setup to prevent any misalignment during final assembly. • Use appropriate tools and wear protective gear when handling the mortar and firebricks. • Allow the mortar to cure fully as per the instructions before exposing it to high temperatures. • For any uncertainties, contact our support team for clarification or optional accessory advice to enhance the installation process.

This mortar is primarily used to secure firebricks to firechests, ensuring a robust construction that can withstand high temperatures.

Pumice is a natural insulator, helping flue gases reach their optimal temperature quickly and retaining heat longer to improve appliance performance and reduce condensation and soot.

Magnum Firechests can create fire openings up to 1.2 meters wide.

Yes, the Isokern DM chimney system is HETAS Approved and CE marked.

Installation instructions are available in our detailed guides to help you set up the firechest smoothly.

Pumice's insulation allows for quicker heating of flue gases and retains heat longer, enhancing performance and reducing condensation and soot build-up.

Yes, National Flues provides reliable delivery across the UK for both retail and trade customers.
Delivery Information +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Wednesday, April 30th. If you need faster stove or fireplace delivery please give us a call. We can often reduce longer lead times if we pay the carrier £25 for express delivery. Visit our Shipping Information page for more information.

Warranty & Returns +

All our products come with warranties. Mi-Flex offers a lifetime guarantee. Returns for damaged items are covered by insurance; non-damaged returns incur return delivery costs.

Price Match Guarantee +

We will match any price like for like on a retail basis. Give us a call if you find it cheaper and want to buy from us.

Read our review in our Firechests - 20kg bag Firebrick Mortar buyers guide

Secure your firechest today with our reliable 20kg bag firebrick mortar, and transform your heating experience immediately.

Your recently viewed products:

Multiple Payment Options- including Klarna, Clearpay, Mastercard, Visa and Paypal