The recipe I used was: sand (chose weber dried 0-4mm) + portland cement + lime (weber släckt murkalk E) + fireplace clay in a ratio of 5:1:1:1. There is a debate on fornobravo about the amount of sand, and a commonly older recipe is 3 parts sand to 1 part other. The mortar is incredibly nice to work with. Plastic and holds the stones well. I was able to build the entire dome without a form thanks to the properties of the mortar. Just hold the stones for a few seconds and they stick to their place. Remember to wet the stones before.
Great thread! Thanks for the nice pictures. I'm approaching construction, have read quite a lot on Fornobravo now.
Does anyone have tips on where to find fire bricks for less than 35kr/brick? After all, it will be about 200 bricks.
I've combed through blocket with no success.
I'm hesitant about trying other alternatives than fire bricks in the dome, like chimney bricks. It would be quite a shame if it didn't turn out well, but feel free to convince me otherwise.
@johanras, considering borrowing your mortar recipe - where did you get the materials?
Bought lime, sand, and cement from Beijer, the fireclay from a stove builder. Used barely 20kg of lime, clay, and cement each. The stones I bought were real firebricks made in Höganäs, through a retailer. Whole brick standard size about 220x110x65mm cost around 50kr if I remember correctly. It becomes expensive and went upward of 10k just for the stones, but I think it's worth it to avoid potential problems, especially when you spend so much time on the work. It gets really hot in the stove, keep that in mind. Maybe regular bricks would suffice, but I didn't feel like taking the risk, and from what I see on FB, everyone uses firebricks. What dimensions are you considering?
Maybe regular brick would suffice but I didn't feel like taking a chance and from what I see on FB, everyone uses fireproof. What dimension are you planning?
Looks good, even though I'm not used to the redder color in the picture. I bought from tegelbolaget in Östersund, the shipping wasn't expensive. Call and check with them what they charge. Sorry, I meant the dimensions of the oven.
Looks good, even though I'm not used to the redder color in the picture. I bought from Tegelbolaget in Östersund, the shipping wasn't expensive. Call and check with them what they charge. Sorry, I meant the dimension of the oven.
Dimension, I think I'll go for 42″.
I'll check with Tegelbolaget, thanks for the tip!
Thank you for taking the time to post the description and the nice pictures. I am working on a similar project myself and have come to the conclusion that I need to mix my own mortar. So far, I have bought 4x4.5kg fireproof mortar from Byggmax but I think I need at least 30kg more.
Best regards // Abboud Yemen
Thank you for taking the time to post the description and the nice pictures. I am working on a similar project myself and have realized that I need to mix my own mortar. So far, I have bought 4x4.5kg fireproof mortar from Byggmax but I think I need at least 30kg more.
Regards// Abboud Yemen
But what are your experiences with vermiculite concrete? How long is the drying time needed? (I think it seems like the vermiculite absorbs a lot of water. The surface is dry after 1/2 days, but judging by the weight of the build, there is a lot of water left...)
Abboud, looks fancy! I'm considering a similar construction, albeit somewhat smaller. Is it progressing? Are you going to insulate? Can you post some more pictures?!
