Sandstone Curb Replacement Standards Division of Infrastructure Management
SCOPE OF CURB REPLACEMENT (Funding Dependent) Sandstone Curb Section I - Purpose: Sandstone curb may be replaced only if existing curb is no longer functional. The purpose of curb is to promote stormwater drainage in line with the original design of the roadway, as well as to eliminate any infiltration of stormwater into the brick pavement or subgrade. Curb also fulfills two secondary purposes Pedestrian safety, it provides a barrier between a pedestrian and moving traffic. Illegal parking barrier, it prevents motorists from easily parking beyond the edge of the roadway, on grassy areas or sidewalk. As funding is limited, these secondary purposes will rarely be used as rationale for sandstone curb replacement. Aesthetic standards are only addressed if there are drainage or infiltration issues. Curb is to be replaced only as needed in specific locations.
Section II - General Guidelines: When funding is available, the following criteria shall be used in the determination of curb replacement locations: Sandstone curb will be used in city of Columbus designated historical districts. Concrete curb may be used in these districts only at radial portions of curb located at intersections, or as needed to accommodate the construction of curb ramps. Replacement of sandstone curb in areas not in historical districts is discouraged. Property owners who wish to install new sandstone curb to replace existing are not permitted to utilize the city s stockpile of sandstone curb, nor will they be eligible for the city s curb reimbursement program. Curb reveal: curbs should not be replaced solely due to low curb reveal. The only time this should be done is if an increase in reveal will enhance the drainage or structural properties of the curb, or if curb function for pedestrian safety or for barrier to parking outside of roadway is needed. During the evaluation process, utilize information provided by the Road Surface Drainage Engineer to investigate areas having previously been identified as having drainage issues. Driveways and mountable curb and gutter pan at driveways should be replaced if their condition has deteriorated to such an extent that drainage is inhibited. These sections are the responsibility of the property owner. Approach shall consist of driveway and associated returns. See Driveway Apron Illustration below. Minimum curb replacement length: All replacements shall be minimum 4 in length. Curb (and gutter pan): Property Owner Responsibility Curb and Gutter: City of Columbus Responsibility Curb and Gutter: City of Columbus Responsibility Driveway Apron Illustration
Section III - General Procedure: The following process shall be used if a property owner desires to replace sandstone curb: 1. The property owner applies for a right-of-way permit for sandstone curb replacement. 2. If the address is located in an official Columbus historical district, the owner is granted tentative approval for sandstone curb replacement. 3. If the address is not located in an historical district, the owner is discouraged from attempting to use sandstone. The owner has two options: a. Sandstone curb option: If the owner wishes to use sandstone, he may do so. However, the owner will not be able to use city of Columbus stockpile of sandstone curb, and the owner is not eligible for the curb reimbursement program. b. Concrete curb option: The owner can replace existing sandstone with concrete curb. In this case, the owner is eligible for the curb reimbursement program. 4. If owner has been granted tentative approval for sandstone curb replacement, a full review of the location will be done by the right-of-way inspector. Refer to Section IV Inspection Criteria, for details of process. 5. If inspection determines that curb does not meet criteria for replacement, the property owner may still replace sandstone curb. However, they may not utilize the City of Columbus sandstone curb stockpile, nor are they eligible for the curb reimbursement program. 6. If inspection determines that curb does meet criteria for replacement, the property owner will be permitted to utilize the City of Columbus sandstone curb stockpile. The owner s contractor can pick up curb needed after the following information has been sent to the yard manager: a. Owner address b. Name of contractor c. Length of curb permitted to be drawn from the stockpile.
Section IV - Inspection Criteria Curb 1. Curb missing or temporary curb installed: Note these locations. 2. Cracks: Note size and number of cracks that visibly extend through the height of the reveal. Note if adjacent sections of curb have shifted along plane of a given crack or have created openings greater than 0.5. 3. Deterioration: Identify deteriorated areas where visible deterioration depth is greater than one half the thickness of the curb. Identify areas where material is loose or easily detached. 4. Offset or shifted curb: Identify sections of curb that have shifted from original alignment by more than ½. 5. Planal deterioration of sandstone curb: Identify planal deterioration extending the height of the curb reveal for sandstone curb. 6. Reveal: Identify locations where reveal is less than 4. 7. Vegetation and silt: Clear vegetation and silt from curb and identify any deficiencies. The presence of vegetation does not in and of itself indicate a need for curb replacement.
Section V - Prioritization Process: 1. Street structural damage noted due to curb and gutter deficiencies. a. Inspection Items: Severely deteriorated curb; significant shifting of curb out of original alignment b. Recommendation: Replace curb sections exhibiting this damage. c. Priority: Level 1a. Curb settling and roll has caused structural failure and has allowed shifting of street brick that rely on the curb to support the units. This is an example of priority 1a. Note: Curb replacement may not be required, however, if existing sandstone curb can be properly reset. Extremely deteriorated curb is showing signs of structural failure, as evidenced by movement of brick pavers. This is a Priority 1a situation.
2. Drainage issues attributable to curb deficiencies a. Inspection Items: Severely deteriorated curb, significant shifting of curb out of original alignment. b. Recommendation: Replace sections of curb adjacent to drainage problem areas. c. Priority: Level 1a. Curb exhibits planal deterioration and appears to have structural failure. Roadway surface has collapsed as a result, creating a low area for Stormwater to collect. This is priority 1a. Curb failure has resulted in creation of a barrier to Stormwater flow. This is priority 1a.
3. Missing curb or temporary asphalt curb in place. a. Inspection Item: Missing curb or temporary asphalt curb. b. Recommendation: Where curb is missing, replace open section with sandstone curb. In sections where temporary curb has been replaced, remove temporary curb and replace with sandstone curb. c. Priority: Level 1b. In this photograph, a section of curb had been removed in the past and was replaced temporarily with asphalt. This is an example of a Priority 1b situation Curb is completely missing at this location. However, structural integrity of the street appears satisfactory, and there do not appear to be any drainage issues. This is an example of a priority 1b situation.
4. Curb deficiencies noted no effect on structural/drainage serviceability of street a. Inspection Items: Two or more significant cracks (0.5 width or more) in a 4 or a 5 integral sandstone curb section. Deteriorated curb where damage extends throughout full depth of reveal; Visible planal damage for sandstone curb extending the full height of the reveal. b. Recommendation: Replace sandstone curb. c. Priority: Level 2. In this photograph, curb is severely chipped at butt joint between two units. However, there are no structural or drainage issues. This is priority level 2. Curb shown exhibits extreme deterioration along layers of sandstone, also known as planal deterioration. Curb is still functional, however. This is priority level 2.
5. Pedestrian safety or parking issues. a. Inspection items: Reveal less than 4. b. This should only be addressed if pedestrian safety or parking issues are to be specifically addressed as part of curb replacement work. c. Recommendation: Use only under specific circumstances. Generally will not apply general maintenance curb replacement. d. Priority: Level 3. 6. Aesthetics. a. Inspection items: General appearance of curb. Chipped or damaged curb that has not impaired its function, but has appearance issues. b. Recommendation: Replacement not recommended. c. Priority: Level 4. This is an example of a curb priority 4, aesthetic issue. Individual sections of curb show chipping and there has been some shifting, but the structural integrity of the curb unit is still intact, and no replacement is necessary. Chipping has occurred at the butt joint between two sandstone units. However, curb is fully functional and is structurally sound. This is an example of a priority 4 aesthetic issue.
Section VI Items to Include for Curb Replacement Item 202.05 - Pavement, Walks, Steps, Gutters, Curbs, or Traffic Dividers Removed Item 609 Curbs Item 659 Seeding and Mulching Item 413 Crack Sealing, Hot Applied
ROW Access Permit Application Submitted - Curb Replacement: Existing Sandstone Curb Present Sandstone Curb Replacement Process: Private Contractors Is the address located in an official Columbus Historical district? Y Owner is granted tentative approval to replace sandstone curb Y FULL REVIEW: Field Review: Permits Inspector Note: May require site visit or assistance by Curb Program Engineer N Permit Office Recommendation: Property Owner Replace Sandstone Curb with Concrete Curb. Owner has two options: Sandstone Curb Option: Owner replaces existing sandstone curb with sandstone. Owner not granted access to city sandstone curb stockpile. Owner not eligible for curb reimbursement program Concrete Curb Option: Owner replaces damaged sandstone curb with concrete. Owner is eligible for curb reimbursement program. Note: During Field Review, Permits Inspector will note damaged curb sections and determine lineal feet eligible for replacement Y Does Curb Meet Replacement Criteria? Note: Curb Program Engineer May Assist in Evaluation Y Owner Approved to Replace Sandstone Curb Sections as Noted by Permits Inspector. Note: Curb Program Engineer May Assist in Evaluation N Sandstone Curb not recommended for replacement. Owner not granted access to city sandstone curb stockpile. Owner not eligible for curb reimbursement program. Permits Inspector contacts Curb Program Engineer. Curb Program Engineer Notifies City Yard at 8181 25 th. Information given to yard supervisor: 1. Owner address 2. Name of contractor 3. Length of curb allowed to be drawn from stockpile, if available.