What heat resistant material for wall oven base?

[weverard]

We recently bought a new oven to replace the one that was installed prior to us buying the house. We have the old oven removed and I put a new MDF base so that the new oven can sit on.

Should I add fibre cement sheet to the base for the oven to sit on?
I was looking at James Hardie fibre cement sheet for the base and back wall. 

https://www.bowens.com.au/p/james-hardie-hardie-flex-fibre-cement-sheeting/

thank for any suggestions

[MitchellMc]

Welcome to the Bunnings Workshop community @weverard. It's marvellous to have you join us, and many thanks for your question about installing an oven.

Technical specifications should accompany the oven on required setbacks from combustible materials and air gaps around the oven. It will show how much room needs to be left around the oven, between it and the cabinetry. If you have the required setback on the base of the oven then you might not need any such shield. It really comes down to the specifications and I would encourage you to reach out to the manufacturer if you are in doubt.

Regarding your question, fibre cement is typically considered a non-combustible material, whereas cabinetry is not. This would help shield the cabinetry from some heat. However, the specified setbacks must still be adhered to unless the instructions specifically state that fibre cement can be used to reduce them.

Please let me know if you have any questions.

Mitchell
 

[weverard]

Thank you. That makes sense. I’ve got all the measurements required in the oven instructions. I’m also wondering if liquid nails and no more gaps is ok to use with the edges of the fibre cement sheet.

[EricL]

Hello @weverard 

I recommend revisiting your manual and technical specifications in regards to what adhesive needs to be used for the fibre cement sheet. Generally speaking, since it will be near your oven it would be advisable to use heat rated adhesives as they will be exposed to the radiant heat of the oven. I don't recommend using liquid nails or no more gaps unless specifically advised by the oven manufacturer. 

Please allow us to make a few inquiries in regards to which heat rated adhesive is advisable to use. As soon as we have more information, we'll get back to you.

Eric

[MitchellMc]

Hi @weverard,

A silicone such as Sika 300g Black Sikaseal Appliance Silicone Sealant is resistant to heat.

Mitchell