mark handler
SAWHORSE
http://www.sfgov2.org/index.aspx?page=427
Tips for Smart Design for Accessibility
The following are tips for the design of "Smart" accessibility - access design features that serve to lessen common construction errors in the field.
Code Sheet. California Building Code (CBC) and Americans with Disabilities Act accessibility guidelines (ADAAG) requirements will change. Always include a code compliance sheet in the front part of a set of construction drawings. Include the release date of the codes used to "bench mark" the basis of design.
Keep Standard Accessible Details Up-To-Date. The California Building Code and ADAAG are subject to change. Update your standard accessible details sheets on a yearly basis. If you are not confident in your knowledge of most current requirements, hire a specialist to review them for you.
CBC Has Two Accessibility Codes.
• Chapter 11A = privately funded, 93Fair Housing94 93adaptable94 dwelling units and
• Chapter 11B = Public Accommodations (commercial) and publicly funded construction for all facilities, including common and public use areas of publicly funded 93adaptable94 dwelling units
• Do not use Chapter 11.
Round Up. CBC 11A and 11B and ADAAG are “minimums”. Always round up fractional numbers when determining quantities of accessible elements. Add control dimensions are to face of finish, and not to face of stud or not always to face of gypsum board.
Average Rather Than Minimum Or Maximum. Design and dimension to the mid or average dimension where a range is provided. Do not use the maximum or minimum dimension. The new ADA/ABA and the ICC./ANSI A117.1 standards do not permit construction tolerances below or above dimensional ranges. For example:
• Stair and Ramp handrail elevation 34 in. to 38 in. - use 35 in. to 36 in.
• Lavatory elevation 34 in. maximum - use 33 in.
• Work counters 29 in. to 34 in. - use 30 in. to 33 in.
No Maximum Ramp Slope. Never design exterior ramps to 1:12 maximum slope or sloped surfaces of 1:20 ration that are not ramps. Concrete slumps and the actual slope range will exceed what you specified. Ramp landings will be shorter due to blended transitions from flat to slopes area. For example:
• Use a 1:13 maximum ramp slope - do not use a 1:12 maximum slope
• Use a 1:22 not-a-ramp-slope - do not use a 1:20 slope
• Use a 72 in. landing run - do not use a 60 in. ramp landing maximum
• Measure ramp slope at the inside radius of curved ramps - not the centerline or outside radius
Show Required Clear Floor Areas. Especially in site and exterior development, illustrate the required level, clear floor areas on civil and landscape plans.
2 In. Handrail Cross Section Is Okay. A 1 BD in. nominal pipe has a 1.9 in. exterior diameter. Nominal pipe sizes are permitted for handrails. New ADA/ABA and International Building Code changed handrail cross-section accessible definition to:
• Cross Section. Handrail gripping surfaces shall have a cross section complying with 505.7.1 or 505.7.2.
• Circular Cross Section. Handrail gripping surfaces with a circular cross section shall have an outside diameter of 1 1/4 in. (32 mm) minimum and 2 in. (51 mm) maximum.
• Non-Circular Cross Sections. Handrail gripping surfaces with a non-circular cross section shall have a perimeter dimension of 4 in. (100 mm) minimum and 6 1/4 in. (160 mm) maximum, and a cross-section dimension of 2 1/4 in. (57 mm) maximum.
Shower Size. Never use CBC 11B's 42 in. by 48 in. size transfer shower. It is not approved under the ADA, and is considered to large for a transfer shower. ADAAG's 36 in. by 36 in. transfer shower is not approved under the CBC.
• Use a 30 in. by 60 in. or a 36 in by 60 in. roll-in shower with a fixed bench for all commercial, institutional or publicly funded construction.
• A 42 in. by 48 in. or 36 in. X 36 in. transfer shower may be used for privately funded, residential occupancies.
CBC Does Not = ADAAG. ADAAG Does Not = CBC. The California building code has not been brought into compliance with ADAAG. Also the CBC contains requirements that do not appear in ADAAG. Neither CBC nor ADAAG contain sufficient information to design a Federally funded dwelling unit. Use UFAS for federally funded (in whole or in part) dwelling units. Some of the unique CBC requirements are:
• Assemblies have additional requirements than what occurs in ADAAG
• Aisle widths with displays or furniture (36 in. to 42 in.)
• 34 in. transaction counter height - not ADAAG's 36 in.
• 40 in. maximum reach range to toilet room accessories - not ADAAG 48 in. or 54 in.
• “Hi” and a “low” pair of drinking fountains - motorized elevation units are rare and difficult to maintain.
• Toilet grab bars mounted at 33 in elevation - not ADAAG's 33 in. to 36 in.
• CBC curb ramps have in line- domes on detectable warnings and they must be yellow - ADAAG requires diagonal alignment and color is not specified.
Tips for Smart Design for Accessibility
The following are tips for the design of "Smart" accessibility - access design features that serve to lessen common construction errors in the field.
Code Sheet. California Building Code (CBC) and Americans with Disabilities Act accessibility guidelines (ADAAG) requirements will change. Always include a code compliance sheet in the front part of a set of construction drawings. Include the release date of the codes used to "bench mark" the basis of design.
Keep Standard Accessible Details Up-To-Date. The California Building Code and ADAAG are subject to change. Update your standard accessible details sheets on a yearly basis. If you are not confident in your knowledge of most current requirements, hire a specialist to review them for you.
CBC Has Two Accessibility Codes.
• Chapter 11A = privately funded, 93Fair Housing94 93adaptable94 dwelling units and
• Chapter 11B = Public Accommodations (commercial) and publicly funded construction for all facilities, including common and public use areas of publicly funded 93adaptable94 dwelling units
• Do not use Chapter 11.
Round Up. CBC 11A and 11B and ADAAG are “minimums”. Always round up fractional numbers when determining quantities of accessible elements. Add control dimensions are to face of finish, and not to face of stud or not always to face of gypsum board.
Average Rather Than Minimum Or Maximum. Design and dimension to the mid or average dimension where a range is provided. Do not use the maximum or minimum dimension. The new ADA/ABA and the ICC./ANSI A117.1 standards do not permit construction tolerances below or above dimensional ranges. For example:
• Stair and Ramp handrail elevation 34 in. to 38 in. - use 35 in. to 36 in.
• Lavatory elevation 34 in. maximum - use 33 in.
• Work counters 29 in. to 34 in. - use 30 in. to 33 in.
No Maximum Ramp Slope. Never design exterior ramps to 1:12 maximum slope or sloped surfaces of 1:20 ration that are not ramps. Concrete slumps and the actual slope range will exceed what you specified. Ramp landings will be shorter due to blended transitions from flat to slopes area. For example:
• Use a 1:13 maximum ramp slope - do not use a 1:12 maximum slope
• Use a 1:22 not-a-ramp-slope - do not use a 1:20 slope
• Use a 72 in. landing run - do not use a 60 in. ramp landing maximum
• Measure ramp slope at the inside radius of curved ramps - not the centerline or outside radius
Show Required Clear Floor Areas. Especially in site and exterior development, illustrate the required level, clear floor areas on civil and landscape plans.
2 In. Handrail Cross Section Is Okay. A 1 BD in. nominal pipe has a 1.9 in. exterior diameter. Nominal pipe sizes are permitted for handrails. New ADA/ABA and International Building Code changed handrail cross-section accessible definition to:
• Cross Section. Handrail gripping surfaces shall have a cross section complying with 505.7.1 or 505.7.2.
• Circular Cross Section. Handrail gripping surfaces with a circular cross section shall have an outside diameter of 1 1/4 in. (32 mm) minimum and 2 in. (51 mm) maximum.
• Non-Circular Cross Sections. Handrail gripping surfaces with a non-circular cross section shall have a perimeter dimension of 4 in. (100 mm) minimum and 6 1/4 in. (160 mm) maximum, and a cross-section dimension of 2 1/4 in. (57 mm) maximum.
Shower Size. Never use CBC 11B's 42 in. by 48 in. size transfer shower. It is not approved under the ADA, and is considered to large for a transfer shower. ADAAG's 36 in. by 36 in. transfer shower is not approved under the CBC.
• Use a 30 in. by 60 in. or a 36 in by 60 in. roll-in shower with a fixed bench for all commercial, institutional or publicly funded construction.
• A 42 in. by 48 in. or 36 in. X 36 in. transfer shower may be used for privately funded, residential occupancies.
CBC Does Not = ADAAG. ADAAG Does Not = CBC. The California building code has not been brought into compliance with ADAAG. Also the CBC contains requirements that do not appear in ADAAG. Neither CBC nor ADAAG contain sufficient information to design a Federally funded dwelling unit. Use UFAS for federally funded (in whole or in part) dwelling units. Some of the unique CBC requirements are:
• Assemblies have additional requirements than what occurs in ADAAG
• Aisle widths with displays or furniture (36 in. to 42 in.)
• 34 in. transaction counter height - not ADAAG's 36 in.
• 40 in. maximum reach range to toilet room accessories - not ADAAG 48 in. or 54 in.
• “Hi” and a “low” pair of drinking fountains - motorized elevation units are rare and difficult to maintain.
• Toilet grab bars mounted at 33 in elevation - not ADAAG's 33 in. to 36 in.
• CBC curb ramps have in line- domes on detectable warnings and they must be yellow - ADAAG requires diagonal alignment and color is not specified.