A good mechanic performs the work properly, regardless of location. If insulation is improperly applied on pipe operating at a low temperature, condensation may occur. The condensation may drip on the ceiling, or on the contents in the building. If pipe operating at a high temperature is improperly insulated, there is wasted energy due to heat loss. Either problem will cost the building owner extra money and possibly the employing contractor will lose future jobs with that client.
Some insulation materials are easier to work with than others.
However, all materials should be applied properly. It takes much skill to perform the many jobs required in insulation work. Skill is displayed by using all materials in their most effective manner, avoiding waste, being precise in measuring and cutting, being neat in the use of mastics and coatings, and keeping the work area orderly and clean. There is great personal satisfaction gained by craftsmanship and by performing work as well as anyone in the trade. Insulation work is a specialized trade and best done by qualified mechanics working for qualified contractors.