Tolerances are not an “oops factor” for careless or sloppy design. ...
Search Results "Tolerance"
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Q2.) What are the types of “field conditions” that were anticipated where the advisory says “tolerances recognized by this provision include those for field conditions”?
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Construction and Manufacturing Tolerances
A tolerance is an unintended, but permitted (i.e., “tolerated”), variation from a specified dimension resulting from the process of construction or manufacture....
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Areas for further work
Of course, it was not expected that all of these would be included in any one industry's standards, but they do indicate the range and complexity of issues related to construction tolerances...
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Q3.) What are the types of “manufacturing processes” that were anticipated where the advisory says “tolerances recognized by this provision include… “those that may be a necessary consequence of a particular manufacturing process”?
To simplify the tolerance assessment, the 2010 Standards specify that the shower compartment be measured at the center points of opposing sides but the expectation is that the width at the...
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R103.1 Conventional Industry Tolerances
R103.1 Conventional Industry Tolerances. Dimensions are subject to conventional industry tolerances except where dimensions are stated as a range....
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Q4.) Are conditions like door closers that require force in excess of the maximum allowed by the standards considered true tolerances or are they simply non-compliance with the maintenance requirements of 35.133 or 36.211?
In our opinion, the plain language of the term “Construction and Manufacturing Tolerances” does not include adjustable conditions that can meet the detailed requirements when properly maintained...
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104.1.1 Construction and Manufacturing Tolerances
104.1.1 Construction and Manufacturing Tolerances....
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Q5.) What dimensions and conditions can practitioners reasonably consider to be compliant when the conditions, as constructed, do not meet the technical requirements exactly and there are no official, published, industry-developed tolerances?
To our knowledge, none of the industry associations have developed official tolerances for sloped concrete or asphalt surfaces except those laid down by large paving machines. ...
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Q6.) How important is the method of measurement in considering the tolerances allowable in finished construction?
Methods of measurement are critical in determining both compliance and allowable tolerances. The industry’s standards are usually very clear about how to make their measurements. ...
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Highway standards suggesting possible applications for pedestrian surfaces
ASTM E 950-98(2004) Standard test method for measuring the longitudinal profile of traveled surfaces with an accelerometer established inertial profiling...
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Suggested best practices for architects and other design professionals
and applications for accessible surfaces, design professionals must also work to minimize problems caused by tolerance issues....
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1 - Design and drawing
If the value is a minimum or maximum or a range, this fact may not be communicated to the contractor, who may think that there is a tolerance ed....
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1.1.4
This allows for a potential plus tolerance of approximately 0.8% while not lengthening the ramp excessively....
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1.1.5
This allows for a potential plus tolerance of +0.5% while still providing for drainage. ADA/ABAAG states a maximum cross slope requirement of 1:48 (1/4 in./ft. [20 mm/m] or about 2%)....
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1.1.6
1.1.6 Accessible surfaces should be as smooth as possible. This includes localized variations in slope as well as bumpiness created by small, individual units such as bricks,...
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1.2.1
1.2.1 Use the plus - or - minus symbol (±) after a dimension when it must be made clear what the expected tolerance is. This should be coordinated with the specification requirements....
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2 - Specifications
However, many industries do not have tolerance standards or the problematic element may be part of a larger assembly for which there are no standard tolerances, the placement of a toilet...
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2.1.1
2.1.1 Clearly state the required installed tolerances for critical construction elements....
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2.1.2
2.1.2 State the required tolerances for elements for which there are no industry standards....
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2.1.3
2.1.3 State requirements for critical accumulated tolerances....
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2.2.1
List all applicable industry standards that define tolerances and measurement protocols, if any....
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2.2.2
Specify the measurement tools that should be used to determine compliance with the tolerances....
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2.3.1
2.3.1 Define the measurement protocols to be used to check for compliance with the tolerances and standards....
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2.3.2
2.3.2 Define the measurement tools that should be used. The acceptable tools should be selected based on the accuracy required and a reasonable balance between the accuracy of the...