Frequently Asked Questions

UNIT 12, Kingswood Douglas Industrial Estate, Douglas Road, Kingswood, Bristol BS15 8NH

Tel: 01179674474 Fax: 01179674475

Email: enquiry@purimachos.demon.co.uk

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Questions

Q1 I want to buy a large amount of firecement to repair the back of my fireplace but the shops only sell small tubs.

Q2 I need to replace a firebrick in a stove but the part isn't available anymore.

Q3 I am building a hobby furnace / forge and I need something to contain the heat.

Q4 I am laying firebricks and the firecement is difficult to work with.<

Q5 The instructions on the tub of firecement say that I should apply heat straight away but I can't do this because the house is empty.

Q6 We have just had a cassette fireplace installed into our chimney breast and all the plaster around the fireplace has cracked.

Q7 How much sand or aggregate can I mix with Jetcem rapid setting cement?

Q8 Can I use Fixatile to adhere a marble fire surround to the chimney breast?

Q9 I want to build a barbecue / pizza oven / firepit outdoors; which material should I use?

Answers



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Firecement is only useful for repairing small cracks or sealing joints. If you need a rendering material then use KOS Heatproof Screed.













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If the repair must be done in situ then use KOS Mouldable Firebrick otherwise cast a new brick in a wooden mould using KOS Heatproof Screed














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A refractory castable such as 1500M is suitable for lining the inside of an oil drum, for example. This is a dry material which is mixed with water and can be installed in the same way as concrete.
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Ordinary firecement is a putty consistency and as such is not suitable for laying bricks. To lay firebricks you should use our KOS Heatproof Mortar.
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The firecement will set eventually without heat but the application of heat accelerates the process.
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Ordinary Gypsum Plaster starts to break down at around 50oC. We recommend using our Heat Resistant Plaster in the hottest area of the chimney breast.
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Jetcem already contains some sand. You can mix sand or small aggregate to a maximum of 50 : 50.
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Marble, in common with some of the very expensive continental tiles, is quite porous. Before using fixatile the reverse of the marble should be sealed with PVA or if using tiles then they should be soaked in water first.
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For outdoor use you should use the KOS Heatproof Screed. If necessary for bigger jobs we can supply this material in 25 kilo bags instead of the 10kg & 20 Kilo tubs.