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Commercial Pop Top

 
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Old 10-15-2018, 12:39 AM   #1
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Commercial Pop Top


Hey guys. Any suggestions on how to put on a second floor above the first here. Two commercial tenants on the first floor have to stay in business during construction. I'm just not seeing it. Even if i ran temp everything before the roof and rafters were ripped off I don't see how I can guarantee the interior stays dry.
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Old 10-15-2018, 09:00 AM   #2
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Re: Commercial Pop Top


Nothing is 100%.

Barring using a crane to lift off the roof and place walls and roof fabbed on the ground, the safest for a solo or small crew is cut a strip out of the roof deck over the top plates, and nail studs to the existing rafters and into the top plate. Patch the existing roof as you go. Get the second story all dried in before you remove the existing roof.

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Old 10-15-2018, 12:55 PM   #3
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Re: Commercial Pop Top


Build a temp shelter About 4-5' higher and wider then New structure with Access panels for any need sky hooks(crane lifts). Think Car port, maybe even thin metal...roofing. Charge for and get insurance for high wind events.

2. demo or RAISE? old roof......What is holding up existing ceilings....

3. plumbing vents and drains??????

4. Is the structure sound with the roof iron removed.

Alternate, Just build a building on pillars/micropiles that surround legacy building footprint. Cut in a few posts near centerline. Lightweight concrete on metal pans for flooring?

2cd Alternate: demo 2 gable ends, build second story end walls, Then shack new floor, demo raise roof in 4-6 bits to conform to existing grid line structures.

What engineer will sign off on the added second floor loads to existing footings???
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Old 10-16-2018, 08:11 AM   #4
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Re: Commercial Pop Top


What business are the tenets in ?, and when you say stay in business I presume you mean occupy building while a second floor is added.

This just seems like a bad idea, how about renting a modular building out front and get the tenets out from under your feet, I have no idea what it would be like trying to run a business under a construction site trying to make phone calls etc.

The liability scares me people coming and going entering the ground level as I am adding a second floor, I would pass.

Fourth Gen make a good point do you have a foundation and walls that will support a second floor, and what will the upper floor be used for ?.
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Old 10-16-2018, 09:41 AM   #5
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Re: Commercial Pop Top


All good things to consider. The liability, walls crashing in while under construction, aspect of it all scares me the most. The building is really a hodge podge. The photo shows one leg of an L shaped building. The other leg houses a mechanics garage (Owner) and then this leg has a bike shop and a car rental place on the first floor and a residential unit on the 2nd. The bike shop needs more space and has been a good tenant so the Owner wants to expand next to the residential unit and above the bike shop and the car rental.

Engineer I work with said typically 8" foundation with frost walls and 2x4 stud walls can be ok for a second floor through structural analysis as opposed to conventional framing.

Other option would be to just add on above the bike shop which is only one guy who would be more accommodating to not being in there while under construction as the addition is for his benefit. (bike shop needs more space)
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Old 10-16-2018, 02:55 PM   #6
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Re: Commercial Pop Top


Are existing plans to this hot mess?

are the top plates elevations the same or is a few buildings that share Party walls.

Will you have to upgrade the old spaces to currents fire & building codes as this is clearly more than a 25% remodel value?

Fire walls between existing tenets?

Adequate parking spaces and sewer runoff storage?

Roof peak elevation need a variance? Are barn style tin roofs still allowed zoning wise?
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Old 10-18-2018, 02:12 PM   #7
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Re: Commercial Pop Top


That would be a nightmare run and run fast!
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Old 10-20-2018, 04:08 PM   #8
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Re: Commercial Pop Top


Tenet is a belief or principle.

Tenant is a person renting real estate.

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Old 10-25-2018, 01:45 AM   #9
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Re: Commercial Pop Top


@ post # 8, wouldn't both apply here?


I can't see any business making so much money, that you can't remove them at some reasonable sum while the dangerous overhead work was performed,

Rent a couple job trailers, and run a couple of wireless routers with decent security....and Hope they just don't leave on their own.

Tell 'em(Tenants) no addition = ever higher rents for the prime location?
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Old 10-25-2018, 09:25 AM   #10
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Re: Commercial Pop Top


I'm sure the guy would like this to happen, but I doubt he'll like the price. It's very doable, but it takes more labor than you may think, plus protecting people from falling objects means you have to fence iff areas or put a protective cover over them.

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