All the types and characteristics of insulation cannot be readily determined within an existing structure due to the possible mix of insulation materials, the inability to observe insulation due to structural elements and other factors. While insulation materials may be identified during a visual inspection, the actual makeup of any insulation can only be determined by laboratory analysis. In certain situations, or if recommended, certain remedial measures will be required. In most cases, however, minimizing disturbance or contact with the insulation material is a feasible approach to minimize potential concerns. If any particular concerns exist regarding any insulation, independent laboratory analysis should be considered.
Vapour barriers minimize the flow of water vapour into and through insulation.
Moisture trapped in insulation, passing through it and contacting a cold surface may condense and reduce the insulation's effectiveness or cause structural damage. Vapour barriers should be installed on the warm side of an insulation area in cold climates. Only one vapour barrier should be installed. A second layer above or adjacent to another may allow the entrapment of moisture and consequential damage. Heat producing recessed light fixtures or chimneys should not be surrounded by insulation.