When I was in masonry biz, in winter, I would construct 2x4 frames and staple clear poly over. I would put one or two thicknesses over the frame, depending on how long i expected to be on the job. We would set up one or two space heaters to keep temp above freezing. It would often take a full day just setting up the tent.
One one job, we were building a foundation under a house that had been moved from another site. We completely enveloped the house and had started the foundation. Footings had been poured before moving the house. The house was sitting on 6x6 cribbing at strategic points. Along came a blizzard, the worst i have ever seen. The wind tore all of the sheeting off and snow settled under the house to a depth in some spots as much as 3 feet. It took a week before we could get back into the job and a good day for us to resheet the house to get heaters to do their job. Footings had heaved, but, luckily, even tho the house had been heaved out of level, there were no cracks inside from wracking of the framework.
that was the only time i had any problems with my tenting. On smaller jobs, it would have been nice to have the easy tenting solutions they have today. I don't know as I would have liked parking my trucks on such tents, but it would have been fun setting up a ski jump now and then. ;D
Tinker