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Basement Guide www.douglas.co.us 100 Third Street ∙ Castle Rock, Colorado 80104

Basement Guide www.douglas.co.us 100 Third Street ∙ Castle Rock, Colorado 80104 ∙ 303.660.7497 ∙ Fax 303.479.7271 1/20/2016 FINISHED BASEMENT REQUIREMENT GUIDE Current Codes: 2012 International Residential Code 2009 International Energy Conservation Code 2014 National Electrical Code 2012 I-Code Resolution No. R-012-110 Douglas County Building Policy Manual Table of Contents: Sample of Drawing Requirements 2 Sequence of Inspections 3 General Building Requirements 5 Egress Requirements 8 Wall Construction 11 Floor / Ceiling Construction 16 Mechanical Requirements 18 Plumbing Requirements 20 Electrical Requirements 22 Douglas County Building Division 100 Third Street, Suite 20 Castle Rock, CO 80104 303.660.7497 Helpful Hint: You may obtain permits in your own name; however, if a contractor is to perform the work, the contractor shall obtain the permit and be listed as the responsible party. In this way, Douglas County will be in a better position to assist you in gaining compliance with codes if the work is defective. A contractor shall be properly registered and insured in order to obtain a permit. 2 1/20/2016 SAMPLE OF DRAWNING REQUIREMENTS • Plans shall be drawn to a scale of ¼” (1/4” = 1’) on white paper in blue or black ink, and shall include room dimensions. • Plans shall show the location of the furnace, water heater, stairs and all existing windows (including sizes). • Label the intended use of all rooms, unfinished areas and make note of the total finish and unfinished square footage. • Please note on the drawings if you have a septic system. Tri- County approval is required if you are adding a bedroom. • Where fire suppression is required, Fire Department review shall be required for submittal. CONCRETE FURNACE WH 8 S S CRAWL SPACE LABEL SPACES THAT ARE UNFINISHED CLOSET CLOSET SUPPLY DIMENSIONS OF ALL EGRESS WINDOWS REC ROOM BEDROOM UNFINISHED SUPPLY HEIGHT OF ALL FINISHED CEILINGS DOE RESIDENCE FINISHED BASEMENT 1313 MOCKINGBIRD LANE 682 FINISHED SQUARE FEET 70 UNFINISHED SQUARE FEET LABEL ALL ROOMS AND SPACES BATHROOM PANELBOARD C O 22.5 10' 17' 13' 10' 8' 6.5' 9.5' 10' PROVIDE ADDRESS AND SQUARE FOOTAGE OF FINISHED AND UNFINISHED SPACES 3 1/20/2016 SEQUENCE OF INSPECTIONS This is a list of the most common inspections that are required for a typical Basement Finish. Some of the listed inspections may not be applicable to your project. Additional inspections may be required for other less typical projects. Underground Plumbing (or under floor) This inspection is performed when the base plumbing drainage system is in place. The inspection shall be approved prior to placement of concrete or floor sheathing. The system may be on test at the time of the inspection with water or five pounds of air pressure shown on a 30 p.s.i. gauge, for systems other than plastic or a flow test may be performed at time of inspection. Plastic piping shall not be tested using air. All plumbing under structural floors shall be suspended a minimum of three inches above the ground to allow for soil expansion. Electrical Slab Inspection This inspection is required when electrical conduits are installed under any concrete prior to placement of concrete. Rough Electric This inspection is to be performed when all of the wire and boxes have been installed. Grounds and neutrals shall be “made up” at the boxes and home runs completed to the panel location. No devices (outlets, switches) shall be installed at this time. All low voltage system wiring (specialty lighting, telephone, data, cable, security, etc.) shall be installed at the time of the Rough Electric Inspection. Rough Frame This inspection is performed once all of the framing, plumbing, and mechanical rough-ins are completed. This inspection may be requested on the same day as the Rough Electric, but cannot be requested before requesting a Rough Electric inspection. 4 1/20/2016 Interior Gas Line This inspection is typically performed at the same time as the Rough Frame inspection. The pipe system shall be completed and tested with a 10 pound air test on a maximum 30 pound gauge, unless alternative piping is used. Insulation This inspection is performed after the basement is insulated and vapor retarders are installed where required. The insulation shall be a minimum of an R-13 in the frame cavities or a continuous blanket of R-10. Shower Pan “Built in place” shower bases shall be sloped and lined in accordance with the code and filled with water. This inspection is typically requested at the same time as the drywall inspection. Drywall This inspection is performed after all the drywall is in place and fastened per code, prior to beginning drywall tape and finishing. Metal trim (corner bead) may be installed prior to inspection, but is not required. Final Electric This inspection is performed when all electrical outlets, lights and switches with cover plates are installed. The electrical panel shall be complete and circuits properly labeled and appliances that are required to be hardwired need to be installed. Final Building This inspection is performed when all life safety items have been completed and the basement finish is completed in accordance with the approved plans. 5 1/20/2016 GENERAL BUILDING REQUIREMENTS Room Sizes One habitable room shall have not less than 120 square feet of gross area. All other habitable rooms shall have an area not less than 70 square feet and shall not be less than 7’-0” in any horizontal dimension. Hallways Hallways shall not be less than 36” in width, finished. Ceiling Heights Habitable rooms, hallways, corridors, bathrooms, toilet rooms and laundry rooms shall have a ceiling height of not less than 7’. Beams, girders, ducts and other obstructions shall not project to within 6’4” of the finished floor. Bathroom Ventilation Bathrooms and toilet rooms shall be mechanically vented directly to the outdoors at a minimum rate of 50 c.f.m. Mechanical ventilation is not required when a window is provided with minimum operable opening of 1.5 s.f. Stairway • Basement stairs shall be provided with a means to light the treads and landings of the stairs. There shall be a switch to the light at the top and bottom of the stairs on stairs with 6 risers or more. • Minimum head clearance from the nosing of the stair treads to the finished ceiling shall not be less than 6’-8”. • The maximum riser height shall be 7 ¾” with a minimum tread depth of 10”. • A continuous and graspable handrail on one side of the stair is required to extend for the full length of the flight. The handrail shall be between 34” - 38” measured vertically from the sloped plane of the treads. 6 1/20/2016 • Guards shall be located along open-sided walking surfaces, including stairs, ramps and landings that are located more than 30” measured vertically to the floor below. Stair Protection Enclosed accessible space under stairs shall have walls and ceilings protected with ½” drywall on the enclosed side. Smoke Alarms • Shall be installed on each floor, in each bedroom, and outside the immediate vicinity of the bedrooms. • New smoke alarms shall receive their primary power from building wiring (120 volt, with battery backup) and be interconnected so that when one is activated, all will sound. • Smoke alarms shall be interconnected by hardwire, or radio frequency wireless. • Shall not be located within 36” of environmental air vents (supply and return). • Shall follow manufacturer’s specifications for location near ceiling fans. • When finishing a basement, or when one or more sleeping rooms are added or created in existing dwellings, the individual dwelling unit shall be equipped throughout with smoke alarms located as required for new dwellings. Carbon Monoxide Alarms • Where work requiring a permit occurs in existing dwellings that have attached garages or fuel fired appliances, carbon monoxide alarms shall be provided. • Carbon monoxide alarms shall be installed within 15 feet of the entrance to all bedrooms throughout the home. • Carbon monoxide alarms shall plug into a dwelling’s electrical outlet and have a battery backup, or be hardwired into the dwelling’s electrical system and have a battery backup. 7 1/20/2016 • Carbon monoxide alarms may be combined with a smoke alarm device if the combined device complies with applicable law (HB 09-1091) regarding both smoke alarms and carbon monoxide alarms and that the combined unit produces an alarm, or an alarm and voice signal, in a manner that clearly differentiates between the two hazards. Basement Exterior Wall Insulation Insulation is required to be a minimum of R-10 continuous blanket insulation or a minimum of R-13 batt insulation in all the stud cavities for the full height and length of the basement wall and crawl spaces. The vapor barrier, either the manufacturers kraft paper, or a clear 4 mil thickness polyethylene plastic sheet, shall be installed on the ‘warm in winter’ side of the wall (behind drywall). 8 1/20/2016 EMERGENCY EGRESS REQUIREMENTS Where Required Emergency egress is required for all finished basements regardless of when the house was originally constructed. Emergency egress is also required in all basement bedrooms. However, basements with bedrooms uploads/s3/ basement-finish-guide.pdf