Disturbance in the Night

Was awakened at 3am by the sound of someone on my roof. I looked out to investigate and discovered a building firm starting to insulate my roof and ceilings. There was also a blizzard.
They were stapling padded tinfoil to the underside of the ceilings and further securing it using mock Tudor beams.
I spoke to one of the workmen and he said the Firm never slept. They worked 24 hours a day, 7 days a week, all year round. They took it in turn to doze in one of the vans. Thus they kept ahead of the Competition.
I told the rest of my household that there was nothing to worry about, except the fact that it was snowing in August.