A horizontal timber or metal resting at the peak of the roof.
Things on top of roofs.
The rafters and trusses are connected to the ridge board for a cohesive framework.
A composite decking made of solid materials.
Assuming you mean big commercial or apartment buildings they might be air conditioning units electrical boxes water tanks or the tops of elevator shafts.
These vents are static vents that are placed over holes in the roof close to the roof ridge.
Bigger ones might be venting kitchen fans.
Parts of a roof decking or sheathing roof edge or eaves edge attic saddle ridge valley underlay membrane eaves membrane underlay membrane drip edge roof vents deflector plumbing vent flashing joint covers shingles.
The pipes are probably venting the toilets.
Unlike box vents which are square off ridge vents are usually much longer and thinner.
For residences it s usually just a c.
What are those things on the roof.
Snow cleats snow stops snow breaks snow blocks snow catchers guttar guards.