Design Criteria & Construction Document Requirements
Climatic and Geographic Design Criteria Table
|Roof Snow Load||Wind Speed||Seismic Design Category||Subject to Damage from Weathering||Subject to Damage from Frost Line Depth||Subject to Damage from Termite||Climate Zone||Winter Design Temperature||Ice Shield Underlayment Required||Flood Hazards||Air Freezing Index||Mean Annual Temperature|
see Section R301.2(4).1
|"B"||Severe||36" Mini-mum||None to Slight||7||-10°F||Yes; see Section R905.1||2012 Federal Emergency Management Agency (FEMA)|
Basic Snow Load Design Table
Roof Snow Load Requirements in Pounds Per Square Foot (PSF)
|Elevation (feet above sea level)||Basic Snow Load (PSF)||Elevation||Basic Snow Load (PSF)|
|6,500 to 6,750||35||9,001 to 9,250||85|
|6,751 to 7,000||40||9,251 to 9,500||90|
|7,001 to 7,250||45||9,501 to 9,750||95|
|7,251 to 7,500||50||9,751 to 10,000||100|
|7,501 to 7,750||55||10,001 to 10,250||110|
|7,751 to 8,000||60||10,251 to 10,500||120|
|8,001 to 8,250||65||10,501 to 10,750||128|
|8,251 to 8,500||70||10,751 to 11,000||135|
|8,501 to 8,750||75||11,001 to 11,500||150|
|8,751 to 9,000||80|
Wind Load Design
*The Wind Load requirements for a specific property can be found on Clear Map, the County online mapping service at the ClearMap website.
WILDFIRE HAZARD MITIGATION
Solar Heat Gain Coefficient (SHGC): While not required for windows in Climate Zone 7, the SHGC is still required data for Manual J calculations. SHGC should be taken directly from the sticker on the glass. If not known, either use default as per Table 102.1.3(3) of the 2009 IECC or equation SHGC equals 0.87 multiplied by the Shading Coefficient under19-23 of Manual J.
Altitude Correction Factor (ACF): Site-specific to elevation
Wind Velocity Values: 15 miles per hour for Heating and 7.5 miles per hour for Cooling
Minimum Residential Code Requirements
Chapter 3 Sections 303 – of the 2015 International Residential Code lists many non-structural requirements that all structures intended for habitation must meet. These requirements include:
Light, Ventilation and Heating – Section R303
Lighting – All habitable rooms shall have window glazing to provide natural lighting that totals not less then 8% of the floor area of the room.
Ventilation – Natural ventilation shall be through windows, doors, louvers or other approved openings to the outdoor air. The minimum openable area shall be 4% of the floor area being ventilated.
Heating – Every dwelling unit shall be provided with heating facilities capable of maintaining a minimum room temperature of 680 F at a point 3 feet above the floor and 2 feet from the exterior wall of all habitable rooms.
Minimum Room Areas – Section R304
Every dwelling unit shall have at least one habitable room that is not smaller than 120 square feet of floor area. Other habitable rooms, except kitchens, shall have floor areas of not less than 70 square feet. All habitable rooms shall not be less than 7 feet in any horizontal dimension.
Ceiling Height – Section R305
Habitable rooms, hallways, bath and toilet rooms, laundry rooms, basements, etc. shall have a ceiling height of not less than 7 feet from the finished floor to the lowest projection from the ceiling. There is an exception for rooms with sloped ceilings requiring at least 50% of the minimum 70 square feet or 120 square feet floor area have ceiling height of at least 7 feet and no portion of the minimum floor area may have a ceiling height of less than 5 feet.
Sanitation – Section R306
All dwelling units must be provided with a kitchen area containing a sink and a bathroom containing a toilet, a sink and a bathtub or shower. All plumbing fixtures shall be connected to both approved water supplies and approved sanitary sewers or approved private sewage disposal systems. Kitchen sinks, bathroom sinks, bathtubs, showers, bidets, laundry tubs and washing machine outlets shall be provided with hot and cold running water.
Please refer to the 2015 IRC for the complete text of the above referenced sections and all other applicable code requirements.
Residential Energy Efficiency Requirements
All new residential construction must comply with the provisions in Chapter 11 of the 2015 International Residential Code and the 2009 International Energy Conservation Code as adopted and amended by Clear Creek County. Due to our higher elevations and colder winters, our county is designated as Climate Zone 7. Any of the following three options may be used to design the new residence to be in compliance with this Code.
Option Number 1 - The prescriptive insulation requirements for Climate Zone 7 are found in Table N1102.1 and are as follows:
Insulation and Fenestration Requirements By Componenta
|Climate Zone||Fenestration U-Factor||Skylightb|
|Ceiling R-Value||Wood Frame Wall|
R-Value and Depth
|Crawl Space c Wall|
|7||0.35||0.60||49e||21||19||30f||10/13||10, 4 feet||10/13|
a. R-values are minimums. U-factors are maximums. R-19 insulation shall be permitted to be compressed into a 2 by 6 cavity
b. The fenestration U-factor column excludes skylights.
c. The first R-value applies to continuous insulation, the second to framing cavity insulation; either insulation meets the requirement.
d. R-5 shall be added to the required slab edge R-values for heated slabs.
e. R-38 is permitted when the full height of uncompressed R-38 insulation extends over the wall top plate at the eaves.
f. Or insulation sufficient to fill the framing cavity, minimum R19.
Efficient Heating Unit and Duct Sizing - In order to ensure that the heating unit and ducts are sized correctly, Manual J and Manual D calculations are required to be submitted. Design Criteria for Manual J
Option Number 2 - As an alternative, compliance may also be demonstrated by using the calculation program known as REScheck, provided by the Department of Energy's Model Energy Code website and submitting the printout and inspection checklist.
Option Number 3 – Another alternative way to demonstrate compliance is through certification from an approved national, state or local energy efficiency program.
Commercial and Multi-Family Energy Efficiency Requirements
Construction Plan Requirements
Residential Construction Plan Submittal Requirements
We accept digital AND physical submissions.
Commercial and Multi-Family Plan Submittal Requirements
The list of construction drawing requirements must be used to ensure that the plans for your commercial or multi-family project are as comprehensive and complete as possible. Submittals lacking sufficiently detailed and complete plans will not be accepted for review.
Two (2) complete sets of plans, approved by all Land Use Departments. Plans shall be drawn to an acceptable, approved, architectural or engineer scale, dimensioned and consisting of but not limited to the following:
- Wet stamp of Licensed Colorado Engineer or Architect on all pages showing structural detail;
- Edition of the Code(s) used;
- Snow load and wind load the structure is designed for;
- Energy Efficiency Compliance including: Method used – Prescriptive, UA Alternative (REScheck) or Performance; Manual J, and Manual D calculation reports; Detail of Thermal Envelope; All insulation detail including foundation/slab insulation, wall, floor/ceiling, roof/ceiling and insulation for and locations of all ducts passing through unconditioned spaces; Window and door schedule, including U-factors; REScheck report if UA Alternative method is used; LEED or other above the code program report if Performance method is used.
- Floor plans Show all floors, both finished and unfinished and for additions or alterations, both existing and proposed. Detail shall include room usage, location, and size of windows and doors, headers, type and thickness of drywall used, location of lights, fans, outlets, GFIs, smoke detectors, carbon monoxide detectors, fire rated walls and assemblies, exit
corridors, and safety glazing. Basements should show the location of above items plus, all means of egress, windows, stairs, furnace, water heater, crawl space access and any other pertinent information including sizes of windows and doors, schedules, water heaters, combustion air and ceiling heights.
- Elevations Show all sides of the structure (maybe less for some additions), showing dimensions, grade levels, windows, doors, roof coverings, identification of exterior materials, guardrails, steps, stairs, basement lines, decks, patio covers, and porches.;
- Foundation Complete detail for Engineered Foundation System; Complete detail for perimeter foundation drain;
- Framing Complete detail for all framing, incl. floor framing for all floors, roof framing or truss specs and layout from truss manufacturer, stair detail, decks, etc as well as all fasteners, hangers, hold downs, etc;
- Braced Wall Design Designate the braced wall method(s) being used and show all anchoring to the foundation, nailing requirements, location of braced wall panels, location of interior braced walls;
- Cross section(s) One or more sections through building showing foundation, framing details, flooring, wall framing, decking, insulation including foundation/slab insulation, U factors and R values, basement walls, floor and roof assembly. A typical wall section should note all pertinent information and extend from the foundation to roof.
- "Class A" Rated Roof Show the Class A material or the Class A rated assembly; Rated assembly for all fire-resistive construction measures chosen for Wildfire Hazard Point System Agreement when applicable.
- Locations of all plumbing fixtures;
- Location and fuel types of all water heaters, furnaces, boilers, wall heaters, etc;
- Locations and fuel types of gas, wood or pellet stoves, fireplaces or inserts;
- Locations of all required Smoke Detectors;
- Locations of all required Carbon Monoxide Detectors
Wood Burning Stove and Fireplace Requirements
The County has adopted the 2015 International Residential, International Building, International Plumbing, International Mechanical, and International Fuel Gas Codes. All mechanical installations must comply with these codes. Our Code requires that all wood stoves and wood burning fireplace inserts be Environmental Protection Agency (EPA) rated.
Open decks which are higher than 30 inches above the adjacent grade and all covered decks and porches, regardless of height above grade, are required to have a building permit – see the Decks page. Minimum frost depth for the piers is 36 inches below grade and the snow load requirements can be found in Basic Snow Load Design Table or on Clear Map, the County online mapping service.