Is there a brick beam with insulated reinforcement

[magnusss]

I am going to build a platform (lecablock) where I will place an inset stove (supra 583N) and then continue to build around it (lecablock). Then I plan to have a brick lintel above the opening.

What I am wondering about is if the reinforcement will cause the brick to crack when it gets hot. Is there a brick lintel with insulated reinforcement?

And if I use an iron beam, the problem will be the same since I plan to plaster everything with lime mortar.

 

[Milkshaken]

Wondering a bit why you need an insulated brick lintel for??? If everything else is built with lecablock, it insulates more than enough... But I think it sounds thermally weak with lecablock... Does it withstand the heat from a fireplace ???? I'm very uncertain about that actually...
I would have built with fireproof bricks a good bit up... Externally, I would have used solid bricks... And of course, a reinforced concrete brick lintel over the opening.

 

[magnusss]

What is the difference between firebrick and solid brick?

I've reconsidered, and it will probably be better to build with brick around the stove itself and a brick arch. The reason I want to use leca is because it is lightweight since I will be building all the way up to the ceiling.

The reason I want to have insulated reinforcement in the brick arch is because I imagine that the reinforcement moves when it gets warm. Which, in turn, can create cracks in the plaster.

 

[Milkshaken]

Refractory is more solid than solid, and burned at a higher temperature..... Solid is a usual brick composition but without holes.....

A reinforced beam has minimal risk of cracking... If you are unsure, consult a bricklayer to see if refractory bricks are also available...
Don't forget to use refractory mortar too....

 

[Daveo]

Reinforcement generally expands as much as the brick and mortar do during temperature changes, so in that regard, the reinforcement does no harm. However, what causes most brick lintels to crack is that the reinforcement starts to rust, moisture gets in, and when the reinforcement rusts, it expands and cracks the lintel. What you should look for then is a lintel with galvanized reinforcement. Oops, maybe this was indoors?

 

[ktm250]

Wondering why you need an insulated brick arch??? If everything else is built with lecablock, it insulates more than well enough.... But I think it sounds thermally weak with lecablock... Can it withstand the heat from a stove ???? I'm very uncertain about that actually... I would have built with firebrick quite a bit up.... Externally, I would have used solid brick.... And of course a reinforced concrete brick arch over the opening.

Of course leca can withstand the heat. Leca can withstand about 1300 degrees. Firebrick built with refractory mortar is only used in the fireplace itself.

 

[magnusss]

Thank you for the responses. I have now built up the platform (40cm) with Lecablock where the stove will stand. My intention was to do the rest with Ytong. But I'm a little uncertain, maybe I should build around the stove with solid brick to get a warm wall and thereby more heat. In that case, one could later continue with Ytong up to the ceiling (I will place a Microlit board against the ceiling).

Furthermore, I don't know if I should cast a beam or if I should buy flat iron and build on that.

How would you do it, and yes, it's indoors.