The construction of physical boundaries creates a barrier against which organic material will often collect (Smith et al. 2001: 258). These divisions are generally visible in the phosphate patterning as bands of increased phosphate content along the length of the feature. The specific patterning of constructed physical boundaries will vary depending on the form of the feature, and can occur on the interior and exterior of structures.
Exterior boundary and interior partition phosphate patterns were confirmed by Smith et al. (2001) in and around a Norse period (9th – 13th centuries AD) house in the outer Hebrides, Scotland. Partition walls and boundaries between activity areas seen in excavation were evident in the phosphate analysis as areas of low phosphate levels with higher phosphate levels along the sides of the features (Smith et al. 2001: 258).