Installation standards and practices
Dry loose-fill cellulose insulation is typically installed in attics and walls with pneumatic blowing machines (although in some attics the insulation can be poured in place). Even though installation methods may vary slightly depending on the material, the machine used, or the actual job-site conditions, the СІМА standard guidelines will provide a general framework in order to better understand installation procedures. The following specifications are for general information only.8 These guidelines cover the application of cellulosic loose-fill thermal insulation in attics, sidewall cavities, and between floors of single – and multifamily dwellings by means of pneumatic equipment and by pouring in place in attics (see Fig. 7.1).
An inspection of the building should be made prior to installation, with special consideration given to the following areas:
1. Holes in ceilings or sidewalls that would allow the insulation to escape should be sealed.
2. Weak areas of interior walls that may not be able to withstand pressures during the filling operation should be reinforced or filled using less pressure.
3. Walls with alterations, such as built-in bookshelves and cabinets, that may create isolated cavities require special entry holes.
4. Wall cavities that are used as air ducts for heating or air-conditioning systems must not be filled with insulation.
5. Openings in heating or air-conditioning systems in insulated areas must have blocking placed around them but not so as to restrict airflow.
6. Wall cavities that open into basements or crawl spaces must be sealed.
7. The external siding of existing buildings should be inspected for paint peeling or other evidence of moisture problems because insulation or a vapor barrier alone may not solve such problems. Other remedial actions may be necessary.