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  • Concrete block dense or aerated
  • nixie
    Full Member

    I’m building the base for a heavy pizza oven. Last time I used dense (7.2N) blocks. Is there any reason that aerated blocks (3.6N) would be a bad idea instead (have a lot further to move them this time and weight is appealing)? 4 courses high supporting a 1200x1200x250mm slab with approx 1 ton of oven on top of that. There will be a decorative brick wall around it.

    nickjb
    Free Member

    They are more prone to cracking and harder to render but neither of those really apply to your application. They can be a bit harder to lay for an amateur as they suck up the moisture from the mortar. Again probably not a big issue for that build. I think I’d still want to use dense blocks. If you can source proper medium dense blocks they are a bit lighter with more or less the same properties as dense. Or why not just build it in decorative brick?

    nixie
    Full Member

    Thanks. Bricks are reclaimed from the house so I only have so many. Blocks quicker for the inner wall which means oven can be used before the outer wall is done (it will have a brick arch which takes me a while to do). I’m being lazy and buying a precast slab for the top.

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