A number of changes have been made to E1155 by committee E6 of ASTM. These changes are reflected in the new Standard Test Method E1155-96, published in January 1996. The changes generally clarify the procedure and clear up minor discrepancies in the older version.   ASTM E-1155 was republished in 2001 without change.     The changes made in 1996 are listed below:

• New drawings are used to clarify how sample measurement lines are to be placed on a test section. (fig. 1)
• The minimum dimension of a Test Section has been revised to 8 feet. This guarantees an 11 ft 45° diagonal line and eliminates a conflict in the old test method. (para 7.2.1)
• The minimum area of a Test Section is now specified as 320 square feet. This provides a large enough test section to be statistically significant. (para 7.2.1) Smaller Test sections can of course be measured, but they will not meet the requirements of E1155, and cannot be expected to have the same precision and bias as larger sections that meet this minimum requirement.
• The 2-foot boundary exclusion is waived, if the area to be excluded exceeds 25% of the Test Section area. This allows the measurement of very small Test Sections. (para 7.3.2.2)
• Parallel measurement lines must be placed more than 4 ft from each other. This is a new limitation to prevent biasing the results of the test. (para 7.3.3)
• The minimum number of Z_i readings per test section has been revised to allow for the effects of measuring large and small sections. (para 7.6)
• A method of measuring the roughness of construction joints has been included. The issue of measuring construction joints had been ignored in the earlier version. (para 7.7, note 4, and 10.3)
• When using the "Parallel and Perpendicular" layout method, the language of para 8.1.3.2 has been changed to "Place equal numbers of lines of equal aggregate length both parallel to and perpendicular to the longest test section boundary." This eliminates a conflict in the previous version of 1155. (para 8.2.3.2)
• A requirement has been added to use only the "Diagonal" layout method whenever Test Sections are less than 25 feet  wide. (para 8.2.3.3)
• The method of calculating a single set of FF and FL values from a Test Surface has been changed from reading-weighted to area-weighted to be consistent with good statistical practice. (para 9.15) Additionally, the format  for reporting FF and FL for a Test Surface has eliminated the requirement for a confidence interval. (para 10.4) (Confidence intervals are still required for individual Test Lines and Test Sections.)
• A statement about the precision and bias of the test method has been added. (para 12)
• Several typographical errors have also been corrected. 

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