ES&H Manual

Fire Protection Supplement


Chapter 2: 

Fire Protection Design Review







Appendix 1:

Relocatable Structure Policy and Worksheet







1.0             Purpose

This worksheet helps to simplify the determination of where a portable structure can be located both exterior and interior of a building on the Jefferson Lab site and the level of protection required. The criteria presented in this worksheet is taken from the following codes and standards:

·         (IBC) International Building Code

·         National Fire Protection Association (NFPA) 80A Recommended Practice for Protection of Buildings for Exterior Fire Exposure

·         Department of Energy (DOE) Standard-1066-2016, Fire Protection, Appendix C Relocatable Structures


2.0             Exterior Relocatable Structures



1.      Complete all sections of this worksheet to the best of your knowledge. 

2.      Send the worksheet to Facilities Management for evaluation and underground utility investigation.


Sketch the buildings and fire hydrants that are near the site where you would like to locate your portable structure.  Include dimensions.


































































2.1              Location Considerations


2.1.1        The following table shows the required separation distance, in feet, that must be available between the sides of the trailer that you are trying to locate and any other building structure, permanent or portable. These clearances do not apply between portable structures within a group that do not violate numbers 2 and 3 in Table 1 below. At corners, extrapolate the straight-line exclusion boundaries to form an “exclusion rectangle”. If this creates a problem, contact Facilities Management.

Table 1: Clearance Requirements for Portable Structures

Points of Consideration

Office Trailers



Single Unit 12’ x 60’

Dbl. Wide 24’ x 60’

8’ x 8’ x 35’







1.       Install without fire suppression sprinklers







2.       Install with fire suppression sprinklers







3.       Minimum clearance to a fire hydrant








2.1.2        The maximum replacement value of the trailer and contents must not exceed $1 million. A double-wide 60-foot trailer costs about $30,000 new; 8' x 8' x 35' transportainer costs about $2,500 used. The maximum replacement value also applies to the total value of trailers and transportainers grouped together.

2.1.3        The maximum floor area of a group of trailers or transportainers must not exceed 7,200 ft2.

·         12' x 60' trailer has 720 ft2 of floor area.

·         24' x 60' trailer has 1,440 ft2 of floor area.

·         8' x 8' x 35' transportainer has 280 ft2 of floor area.

2.1.4        Relocatable structures cannot be placed over manholes, drains, valve boxes or any underground equipment and utilities that would become inaccessible.

2.2              Installation Notes

2.2.1        The ground under the trailer must be built up with fill sand to be higher than the surrounding grade to prevent moisture damage to the trailer floor.

2.2.2        The ground under the trailer must be built up with fill sand to be higher than the surrounding grade to prevent moisture damage to the trailer floor.

2.2.3        The trailer foundation must be double blocked with 16” x 16” piers five feet on centers.  The piers are to be set on undisturbed soil. The base block of each pier is to be 24" x 24".

2.2.4        All of the anchor straps must be connected to earth anchors with no slack.

2.2.5        A skirt must be installed continuously around the base of the each trailer. The skirt is to have at least one removable 30‑inch‑wide panel for access under the trailer. This access is to be located at the electrical panel conduit.

2.2.6        All relocatable structures should be marked with the number, symbol, or name for identification purposes. The marking system used should be permanent and consistent with the system currently used at the site.

2.2.7        Portable heating appliances should not be permitted unless they are approved by the Fire Marshal and are a listed or approved type.

2.3              Location Restrictions

2.3.1        Relocatable structures should be placed so emergency vehicles can operate within 100’ of the structure.

2.3.2        Portable fire extinguishers, listed by a nationally recognized independent testing agency, should be provided for portable structures in accordance with NFPA 10.

3.0             Interior Relocatable Structures (aka Clean Rooms)

The following conditions are required when a relocatable structure is to be installed in the interior of a building, regardless of use:


3.1              Permit Requirement

3.1.1        The JLab Fire Marshal must be notified of the intent and plans to place a permanent or semi-permanent room greater than 65 ft2 in service. The Fire Marshal will inspect the location, provide protection requirements for the room, assign a unique identifying number to the room and issue a permit. The permit shall be attached to the outside of the structure and renewed annually.

3.1.2        The owing division will be identified as: NP (Nuclear Physics), EN (Engineering), AO (Accelerator Operations) or FM (Facilities Management). Room numbering example: EEL-NP-01 (EEL building, Nuclear Physics, #).

3.2              Construction Materials

3.2.1        Vinyl membrane material must be POLYSIM 509 (Simplex Isolation Systems) or equal.

3.2.2        Flame spread rating (= or <10) and Smoke Density (= or < 195) per ASTM E84-00A Standard Method of Test For Surface Burning Characteristics of Building Materials.

3.2.3        Must pass NFPA-701-2004 Test Method 2 for Flame Propagation of Film.

3.2.4        Framing must be non-combustible.

3.3              Protection Measures

Points of Consideration

Vinyl Sided Rooms


Protective Features



1. Rooms or tents less than or equal to 65 ft2          (on or off wheels)



2.  Rooms greater than 65 ft2, but less than 130 ft2



3. Rooms equal to or greater than 130 ft2



The size, location and processes in the room will dictate the number of sprinklers required or other protective measures that may be required by the Fire Marshal.

3.4              Demobilization

Rooms that are no longer needed shall be demobilized and removed by the owning division. The material may be stored for future use or discarded. Under certain circumstances, a room may be left in-place with the prescribed protection intact for up to 90 days pending determinations for future use. However, the room shall not be used for storage of combustible materials.

4.0             Revision Summary

Periodic Review – 01/03/19 – No changes per TPOC

Revision 0.3 – 03/15/17 – Added section entitled “Interior Relocatable Structures”

Periodic Review – 06/02/16 – No changes per TPOC

Revision 0.2 – 09/07/13 – Updated reference to DOE Standard

Revision 0.1 – 04/15/11 – Removed [skirt] “of non-combustible material (metal)…” in 3.0 Installation Notes; skirting is required, but material’s combustibility is not specified.









Fire Protection Department

Tim Minga





This document is controlled as an on line file.  It may be printed but the print copy is not a controlled document.  It is the user’s responsibility to ensure that the document is the same revision as the current on line file.  This copy was printed on 1/11/2019.