Field Use and Statistical Sampling

When approaching a building with the intention of assessing the quality of the sealant joints, the question arises, “Does the entire building need to be tested?” Under many circumstances, the answer is yes. This may be due to a specification, a warranty requirement, or any variety of other conditions that we need not discuss here. The question to address here, based upon experience in the field, is what constitutes an adequate sample that will provide quantifiable data for statistical relevance?