I was surprised how well Loki dealt with the roof construction. We only had to give him the anxiety meds three times during the whole process.
I found he often hid in my closet when the “men with boots” came to the house. So I set up a basket for him in the closet and he went there everyday to sleep until all the men left. Then he would emerge hesitantly (see above) until he was sure the place was safe. Once he was cool and settled, he was fine until the whole scenario replayed the next morning.