Go to the top, walk every hallway of every floor while checking doors until you hit the ground, then exit and walk around the exterior. Rinse and repeat until your shift is over. Standing and staring at an alarm panel that doesn't work is pointless, and you don't leave the site or stop until you're relieved otherwise what's the fucking point? I'm sure that's what you're client hired the company for and expects.

I can't really tell if you're asking this stuff because you want to know if you should be doing more than your company is telling you to do, or if it's because you want to do the least amount of work possible even if it defeats the entire purpose of you being hired. If it's the latter, you're shit at your job.

For the record, if you're hired to do a fire watch you fucking do the fire watch. You don't call firefighters to come and tell you if it's needed, you fucking do the work you're being paid to do. On top of that a building under construction is completely different than one with people living in it for fucks sake.

If I'm reading this wrong I apologize, but I've worked with some lazy ass fucks and wouldn't be at all surprised. So if I am reading this right you either need to get your shit together, or quit. Earn your pay.