Bad: scalfiding
Good: scaffolding

Here are some ways I can remember how this is spelled. SCAfFOLDing is when you need help SCAling up a sharp incline such as a wall of a building. To get higher on the building you FOLD together a bunching of wood planks or metal bars to create a form of ladder. Then you have Folding blocks to scale the building wall or scaffolding.

Have an alternative way to spell this word? Please share your ideas in the comment section of this blog. Thanks.