Thermaling is a stone-finishing process where a mason passes a hot blowtorch over the surface of a natural stone, usually granite. The intense heat causes the crystalline structure on the surface to pop and flake off, leaving a rough, uniform texture. This technique is primarily used on paving stones and steps to provide traction when wet.
Heard on the job
We need to thermal the edges of these granite treads before we set them on the porch.
Also heard as
- flame finish