Design Master Plan

Policy and Procedures
Effective April 1, 1998

Design Master Plan: A Design Master Plan (DMP) is a document, or set of documents, used for constructing multiple units utilizing the same plan and may or may not contain options.

Feature: One of the optional elements that make up a building. An option once chosen for inclusion in a model plan becomes a set feature of that plan and is no longer an option.

Model: A model building using a unique combination of features chosen from the Option List.

Model Plan: A floor plan that reflects the actual layout of the building and illustrates the specific combination of features chosen from the DMP Option List. Specific model floor plans shall clearly identify the corresponding DMP approval number. Each different model plan shall have a unique title or numeric designation and specify the option features used from the DMP.

Option List: An approved menu of design features listed on the DMP cover sheet that the manufacturer may choose to add or omit from the standard DMP. Each design feature shown on the Option List is identified by a separate title and number or letter designation.

Structural Design Package: A structural design package with engineering calculations and assumptions for one (1) building length/width, one (1) roof and wind load design and one (1) occupancy use.

1. A Design Master Plan submittal needs to be clearly identified on the application for plan approval, on the plans themselves, and on the design calculations.

2. Design plans shall be prepared and designed by an Oregon licensed engineer or architect as required by OSSC 106.3.2. A wet stamp is required on at least one set of documents.

3. Plans shall be drawn to scale and shall be of sufficient clarity to indicate the location, nature and extent of the work proposed and show in detail that it will conform to the provisions of the code and all relevant laws, ordinances, rules and regulations currently adopted. Plans shall also be user friendly.

4. The Design Master Plan shall be designed to meet worst case conditions for wind (90 mph) and energy conservation ( zone II ).

Exception: 1. A site specific Design Master Plan may be designed to meet the minimum wind and energy requirements of a specific address/location. Approval of a site specific Design Master Plan shall be limited to a specific project, orientation and number of buildings that are to be located on the same plot of land and permanently installed on a foundation system. Minimum submittal requirements for a site specific DMP shall include a plot plan. The application for plan approval and the plans cover sheet would need to clearly identify the submittal as a "Site Specific DMP".

Exception : 2. A zone I option will be permitted when new insignias and associated forms are in place after March 1, 1998.

5. The Design Master Plan Approval shall be for a series of identical structures identified by Model type that have identical floor plans, structural details, engineering criteria and type, location and installation of plumbing, mechanical and electrical equipment. The Design Plan Approval shall be for one occupancy, one type of construction, one floor load design, and one wind load design. Multiple roof load designs will be permitted as options provided:

A. The minimum roof load design on the DMP (LL 25) is not an option. Other optional roof loads are identified as options on the cover sheet and assigned an option number.

B. Design calculations for each roof load proposed are separated from the base calcs.and identified by an option number that correlates with the option as indicated on the plans cover sheet.

C. A separate plan sheet is provided for each roof load option proposed. All design requirements, methods, materials and connections that pertain to that specific roof load option shall be included therein.

D. Roof load options will be limited to 4 in addition to the base design and are only acceptable as an option at time of initial submittal.

6. Design Master Plan Options may be included at the time of submittal as long as plans and engineering are provided. DMP options proposed need to be listed on the cover sheet and identified by number or letter designation. A Specific floor plan (Model) will be required for each combination of features used from the DMP option list. The following are EXAMPLES of acceptible options:

A. Use of rafters instead of trusses, or vice versa. Design calculations separate from the base calculations would be needed. (Typical) separate calculations should be identified by an option number that correlates with the option as identified on the cover sheet.


B. Siding or roofing options. Separate calculations may be needed.

C. * Windows (Allowable maximum/minimum square footage, locations).
* Doors (Allowabe size in conjunction with windows).
* Rooms (Wall locations with plus/minus).
These three options should be listed on the cover sheet with supporting assumptions. An example of a wall location option would be : Walls proposed within a floor plan at 12' from either or both ends of a 12' x 56' unit with the ability to move either or both walls 2' max. in either direction.

D. Optional HVAC systems, such as electric, gas and oil, shall be listed on the cover page.

E. Plumbing options may be included. For instance, a bath option would require a floor plan, plumbing schematic, lighting and ventilation details. On a 24' x 66' master plan, a bath option could be shown in one corner; however, the option could be extended by stating "the bath can be located in any corner of the structure". Thus, with one floor plan, four options are covered in the DMP.



F. Electrical options may be included. For instance, an electrical service may be a larger size than shown for the base DMP building. The option submittal would show at a minimum, load calculations and installation schematic diagram(s) with panel schedule.

G. The number of design options will not be limited with original submittal.

H. A maximum of five additional options may be added to the DMP during the one year approval period.

I. An option plan (Model) must go directly back to the DMP and not to another model or option. No "sub-options" or "alternates to options" or "alternates to alternates" are allowed. Once a model is approved, any feature changes would create a new model requiring a new submittal for DMP approval.

J. Each width shall stand alone, with multiple lengths allowed. For structural design purposes, the units may be the same or broken down into only two (2) length catagories for wind design purposes. Units within these categories shall be designed to be constructed identically for snow, wind and seismic loads.

7. A Specific floor plan (Model) will be required for each combination of options used from the DMP option list. At the time of approval, the DMP shall include a standard floor plan that indicates minimum compliance. In addition, specific Model floor plans may be submitted at the time of DMP review/approval and/or at a later date. Specific model floor plans submitted for review/approval at a later date shall clearly identify the corresponding DMP approval number. Submittals shall include an application for plan approval, application for insignia and appropriate review/insignia fees. The model floor plan and application for insignia both shall identify the model designation and specify the option features used from the DMP. Specific model plans will be considered off-board work and will be reviewed consistant w/ revisions and resubmittal information at a time between normal plan review processes at current per hour rates. As standard operating procedure, a reciprocity courtesy review will not be required for specific floor plans ( Models) submitted at a later date than the DMP. In special circumstances, however, the examiner may request technical consultation and/or courtesy review comments from the reciprocal state when a specific combination or orientation of option features proposed in a Model plan appear to interact in such a manner as to create a noncomplying or potentially noncomplying condition.

8. Design Master Plans shall be renewed annually @ 50% of the original plan review fee if the manufacturer chooses to continue constructing under that same plan until a code change occurs for one of the receiving states. In a code change year, a complete resubmittal with fees will be required upon adopting new code documents unless plans have already been up-dated and approved by Washington or Idaho under reciprocity provisions due to
earlier code adoption and implementation dates. In these instances, code changes specific to adopting a new Oregon Specialty Code in Oregon can be treated as amendments to an already up-dated plan approval.

9. When the manufacturer submits options or the code requires changes (after DMP approval), appropriate plans indicating the changes shall be submitted by the manufacturer. These changes or options shall be reviewed for compliance to code and the DMP. All changes and options to the DMP will be reviewed at current per hour rate.

NOTE: Variations to DMP's that do not fall within the parameters of the design options approved with original submittal shall be processed as custom structures which require the submittal of custom plans. Individual applications, fees, plans and engineering will be required for all custom structures.

10. A structural design package inclusive of calculations and assumptions for one (1) building size, one (1) roof and wind load design and one (1) occupancy use may be submitted for review/approval. When approved, the structural design package may be used to validate basic design assumptions w/in DMP's of the same size, design criterial and occupancy classification. When a DMP is submitted for review/approval, and a structural design package under prior approval is used to validate design assumptions, the DMP shall cross-reference the structural design package approval number. A DMP may only cross-reference to an approved structural design package for design assumptions and shall not cross-reference to another DMP. Option(s) proposed in a DMP that change the basic structural design need to be stand alone and include separate calculations to validate the option(s).

11. An energy design package inclusive of energy forms and associated computations for one (1) building size, one (1) occupancy use and one (1) energy zone may be submitted for review/approval. When approved, the energy design package may be used to validate a basic energy design w/in DMP's of the same size and occupancy classification. When a DMP is submitted for review/approval, and an energy design package under prior approval is used to validate basic energy design assumptions, the DMP shall cross-reference the energy design package approval number. A DMP may only cross-reference to an approved energy design package for basic energy assumptions and shall not cross-reference to another DMP. Option(s) proposed in a DMP that change basic energy design package assumptions need to be stand alone and include separate forms/assumptions to validate the option(s).

12. An electrical design package for one (1) building size and one (1) occupancy use may be submitted for review/approval. At a minimum, load calculations and installation schematic diagram(s) with panel schedule(s) shall be provided. When a DMP is submitted for review/approval, and an electrical design package under prior approval is used to validate electrical design assumptions, the DMP shall cross-reference the electrical design package approval number. A DMP may only cross-reference to an approved electrical design package for design assumptions and shall not cross-reference to another DMP.

13. Trusses constructed by prefabricated structure manufacturers shall have third party approval and inspections by an approved third party inspection agency. Reports by third party inspectors shall be filed with Building Codes Division.

14. Ridgebeams constructed by prefabricated structure manufacturers shall have third party approval and inspections by an approved third party inspection agency. Reports by thiird party inspectors shall be filed with Building Codes Division. In lieu of approval and inspections by an approved third party, the design professional of record may provide a design in accordance with accepted engineering principles and perform structural observation as described in OSSC 1702. The structural observer shall submit to the building official a written statement that the site visits have been made and identify any reported deficiencies including resolution.

15. A "Custom Plan" may be converted to a "Design Master Plan" upon request by the manufacturer. The fee shall be the difference between the plan review fees for a design plan and those submitted by the manufacturer for the existing custom plan. A converted plan will expire one year from the original approval date. All changes or options submitted with conversion request shall be reviewed at current per hour rate. Plans converted from "custom" to "design master" shall meet all of the criteria for master plan consideration.

16. DMP PLANS SHALL INCLUDE, BUT NOT BE LIMITED TO THE FOLLOWING MINIMUM ITEMS:

a. Standard basic floor plan consistant with design assumptions (size).
b. Structural cross-section(s) with specific materials and fastening clearly identified.
c. Two exterior elevations, min.
d. Relevant structural details.
e. Stamped truss drawings (if applicable).
f. Plumbing schematics (if applicable).
g. Fastening schedules.
h. Mechanical schematics (if applicable).
i. Electrical schematics with load calculations.
j. Cover sheet with options listed (if applicable).
k. Design criteria, occupancy, type of construction and governing codes identified on the cover sheet.
l. Site plan and/or declaration on cover sheet regarding min. distances to property or assumed property lines.
m. Room uses clearly identified.
n. Window, door and hardware schedules as necessary to clarify proposal. Door hardware
shall be clearly identified as to lever or panic etc. Stock and order numbers are not acceptable.
o. Materials schedule.
p. Minimum zone II energy compliance demonstrated in the plans. This includes insulation R values and component U-values clearly stated. Completed energy conservation forms need to be provided to substantiate assumptions.
q. Accessibility compliance demonstrated in the plans.
r. Notice To Local Enforcement Agency (NLEA) when required.

17. ENGINEERING FOR DESIGN PLANS SHALL INCLUDE, BUT NOT BE LIMITED TO THE FOLLOWING CRITERIA:

a. Design assumptions shall be in accordance with well-established principles of mechanics in accordance with OSSC 1605.2
b. The loadpath shall be clearly identified in accordance with OSSC 1605.2
c. General Design Methods in OSSC 1605.
d. Uplift/Overturning in OSSC 1605.2.2
e. Floor design in OSSC 1607.3
f. Roof design in OSSC 1607.4
g. Wind design in OSSC Chapter 16, Division III.
h. Wood column design (if applicable) Ref NDS-91 and NDS supplement.
i. Seismic design in OSSC 16.
j. Computer generated calculations are acceptable only if substantiated by the program.

18. All items in #16 and #17 above must be included in the DMP or the submittal will be determined incomplete and returned to the applicant for completion prior to further review.

19. Plans containing repetitive noncomplying code issues that have been clearly identified in prior reviews may be determined incomplete and returned to the applicant for revision prior to acceptance of the submittal.

Note: The Design Master Plan policy and procedures outlined herein are subject to re-evaluation annually.