Is fixing adhesive or joint filler suitable as a base for fire?

[Timmerö]

I'm building a wood-fired patio heater and would like to have a couple of cm of some kind of mortar at the bottom, nearest the fire.

Under the patio heater, there will be about 50cm of air and then probably a sheet of metal on the decking if needed.

I have fix and grout at home, can I use any of them? It's okay if it cracks a little.

 

[z_bumbi]

It is a clay that is placed at the bottom and sides of open fireplaces. Available, among others, from companies that service tiled stoves and open fireplaces.

 

[Lostmoose]

It will probably work with fix/grout, but I wonder if it will revert to powder form after some time of use?
I bought spislera at Bauhaus for my kitchen stove, you should be able to use that.

 

[sve84]

I'm building a wood-fired patio heater and would like to have a few cm of some kind of mortar at the bottom, closest to the fire.

Under the patio heater, there will be about 50cm of air and then probably a sheet on the decking if needed.

I have fix and grout at home, can I use any of them? It doesn't matter if it cracks a little.

Fireproof brick and fireproof mortar maybe?

 

[Timmerö]

Thanks for the tips, I'll see if I try with fix or fog first and then fire clay or stove clay if it pulverizes.

Inspo below, where the bowl will come from a broken Weber grill that has some holes in the bottom (which is also very thin), hence I thought that a few cm of some form of mortar could be good.

 

[z_bumbi]

If you place sheet metal directly underneath, the mortar will definitely crack and break into small pieces. Place a mesh over the holes and then a layer of gravel to protect both the sheet metal and the mesh.

Personally, I would insert a pasta insert from IKEA (for 5 l pots) and then make a fire in it, but that's mostly to save wood and provide even heat. Still, place a mesh at the bottom of the grill.

 

[Timmerö]

If you put sheet metal directly underneath, the mortar will definitely crack and break into small pieces. Place a mesh over the holes and then a layer of gravel to protect both the sheet metal and the mesh.

Personally, I would put in a pasta insert from IKEA (for 5-liter pots) and then burn in that, but that's mostly because it saves wood and provides even heat. Still place a mesh at the bottom of the grill.

I will try with gravel! But it would be nice if the gravel "stuck" since I'm planning to build it so that you can rotate the bowl if you want it completely horizontal. However, I think it will mostly be angled as shown in the picture above.

I like the idea with the colander! I'll try that too, I googled it a bit and it seems to be a good way to burn pinecones, which I have enormous amounts of