I am going to lay new fireproof bricks in my fireplace.
I have removed the ones that were there, and now it looks like the pictures.
Do I need to fill the voids, or can I ignore them and proceed as it looks now?
What else should I consider?
Will you fill them with just mortar?
And if so, should it be applied in layers or is it acceptable to fill a 3x3cm gap all at once?
Or on second thought, should I probably fill everything and insert small stones where I can?
I have ordered 25 kg of pre-mixed "mortar" (https://www.schamotte-shop.de/icf-spezialmoertel-25kg-eimer-gebrauchsfertig-ohne-anruehren-2.html) and I don't think it will be enough if I need to fill up as well.
There will be chamotte stones 4cm at the bottom and 3cm on the sides.
Do I need refractory mortar for filling behind the stones?
Are you going to fill them with only mortar?
And if so, should it be done in batches or is it just a matter of filling a gap that is 3x3cm all at once?
Or, come to think of it, should I probably fill everything and insert small stones where I can?
I’ve ordered 25 Kg of pre-mixed "mortar" ([link]) and I don’t think it’ll be enough if I should fill it up as well.
There will be chamotte stones 4cm at the bottom and 3cm on the sides.
Do I need refractory mortar for filling behind stones?
Looking for answers to pretty much the same questions.
I was thinking of "grouting" the red brick so I get an even surface to work from.
Read somewhere that you should leave some expansion space between refractory and red brick.
I find it a bit difficult to find information about stove masonry in general.
I have decided not to fill behind beforehand.
I will try to apply generously on the stones before I place them and adjust.
This will probably create some expansion space.
