Chimney Linings and Firebacks

Micafil concrete is ideal as a filler to insulate around flue linings, behind firebacks and around pipes when fitting heaters.

Firebacks protected in this way are less likely to crack because of the cushioning effect of the Micafil concrete, and its insulating effect ensures more heat is returned to the room.

In chimneys, use Micafil concrete for extra insulation between brickwork and flue. This helps to maintain flue gas temperatures thus improving draught - more important than ever with today's high efficiency boilers.

Typical Use		Chimney Filling
Mixing Ratio by Volume		6:1
Materials to place 1m3 of concrete	Micafil Vermiculite	12 bags
	Portland Cement	12 bags*
	Water	276 litres
Smaller batch mixing	Micafil Vermiculite	1 bag
	Portland Cement	1 bag*
	Water	23 litres

*Based on a standard 25kg bag of cement.

Downloads

Guide to using Micafil Vermiculite for Lightweight Concrete (287 KB)

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The above product information is given in good faith as accurate and reliable but is not to be taken as a guarantee. The figures provided are intended to be a guide to expected average values and should not be interpreted as a specification. Any potential applications referred to are not to be construed as recommendations. It is the responsibility of the user to determine suitability for any specific purpose.

Dupré Minerals

Chimney Linings and Firebacks