Yeah thats why I put the layer of bricks on the lintels as well so it wouldnt be an issue.I built a brick braai at my previous house, with a suspended grid for the coals (1 brick height above the bottom bricks). The bottom of the braai would still get hot so that I could feel it from underneath. This is not good for the cement (I used lintels as well, and the heat is worse for those). So I added a loose layer of facebricks (with the holes in the middle) just standing on top of the base. Only the front row were cemented in to prevent them falling out, and this worked very well. No heat coming through the bottom of the braai anymore. The ash gets in between the loose bricks over time so I just removed and cleaned them once in a while.



(joking)