Jobsite Signs?

We like this form of advertising, in applicable situations. It tells the customer we're actually doing a job.

This is an old chopped glass roof that got hail last June. We'll be foaming it and adding chopped glass rather than white coating.

I say "applicable situations" as we're careful to not let our competitors know which roofs are ours unless that customer is extremely solid and we know we won't lose the job to someone else.