Hi all!

I am trying to determine how close I can place a modular building (portable trailer) to an existing structure. The existing building consists of the following: 8,900 SF - Type 5A - I-2 / B occupancy with fire sprinklers. The building has an existing exterior door that will remain. The existing exterior walls are 1hr construction. The existing building will be 3,600 sf – Type 5B – B occupancy with fire sprinklers.

Per CBC 2010 Section 705.3 I can consider the buildings as one building. If this is the case, do I still need a separation between the I-2 use and the new modular building? Most likely I will plan on keeping the buildings at least 5’ away from each other due to an existing door. If not, can I consider this building a Nonseperated Occupancy per CBC 508.3?

Thanks for your help! Let me know if there is any other information that you need.



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Original Post
To do the unseparated occupancy you need to calc the allowable versus actual area ratios and sum cannot exceed 1.
Otherwise use the minimum yards for each building based on the construction type and fire rated existing conditions for walls AND openings then sum them to get the separation.

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