Ask an Expert

What filler should I use for gaps on my rendered and painted wood fired pizza oven, which gets quite hot?

My pizza oven has a concrete render exterior, on insulation sitting over the terracotta oven base. Gaps have appeared in the render and I want to fill them and paint over. The exterior of the oven gets quite hot when in use, oftentimes too hot to leave your hand on. I need to fill the gaps with a filler that is heat resistant.