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Backfilling is something we’re regularly asked about when a traditional cast iron fireplace is being installed. In simple terms, it means preparing and filling the space behind a cast iron insert as part of the installation. It’s particularly important when the fireplace is being used for solid fuel, because the area behind the insert needs to be prepared correctly to cope with the heat from the fire.
A cast iron insert sits in front of the fireplace opening, leaving a space behind it. That space forms part of the fireplace installation and needs to be prepared properly rather than simply left as a large open void. Backfilling helps create the correct setup behind the insert and fireback while allowing the fireplace to deal with the heat produced during use. Cast iron expands as it gets hot, so the way the fireplace is installed matters. Poor fitting can put unnecessary stress on the casting and may contribute to cracking or damage.
Heat-resistant materials such as vermiculite are traditionally used as part of the backfilling process. The exact materials and method depend on the cast iron insert, fireback and fireplace setup being installed. This is where an experienced fireplace fitter is important. They can prepare the area behind the insert to suit the particular fireplace rather than relying on one general mix or method for every installation.
The fireback sits behind the fire and protects the cast iron insert from the most direct heat. On a solid fuel fireplace, it takes a considerable amount of heat and may eventually need replacing. The fireback and the area around it need to be installed correctly so the fireplace can heat up and cool down without putting unnecessary pressure on the cast iron. If the fireback becomes badly cracked or damaged, it should be checked before continuing to use the fireplace.
For a working solid fuel fireplace, we’d use an installer who understands traditional cast iron fireplaces. The insert, fireback, chimney, hearth and opening all need to work together, and what happens behind the fireplace is just as important as what you see from the front.
Our fireplace fitting guide gives a broader overview of how the hearth, insert or chamber and surround are normally fitted together.
If the fireplace is going to be used for solid fuel, have the chimney swept and checked and make sure the complete installation is suitable before lighting a fire.With a newly installed cast iron fireplace, start with smaller fires and bring the fireplace up to temperature gradually rather than lighting a large fire immediately.
If you’re buying a cast iron fireplace or fireplace package from us and your installer needs dimensions or information about the components supplied, get in touch and we’ll help with what we can.
Phone
01773 718718
Email
sales@castfireplaces.co.uk
