RECOMMENDATIONS

In addition to the traditional performance (R-value, resist air infiltration) we are looking at the environmental performance such as:embodied energy, the possibility of recycling or reusing the materials, and toxicity ( to occupant and workers). But we cannot forget that the main role of the insulation is the R -value.

The energy performance of an insulation products is the most important environmental characteristic to look at when we have to select it.

Always specify sufficient insulation for the climate zone in which the building is located.

Adding insulation is one of the best way to reduce home energy usage. Insulation can reduce the cost of heating by as much as 30%-50%.

Try to avoid HCFC-foamed insulation when it is possible.

Choose insulation materials with high-recycled content.

Select insulation that uses renewable raw materials, with low energy production requirements,and degradable wastes (cellulose, cotton).

Keep insulation dry to prevent growth of fungi and bacteria

Use protection for the installers. Use adequate ventilation during installation and curing.

The reusability of insulation materials is dependent on how those materials were installed. To be able to reuse the products it is recommended to install a layer of sheating between the insulation and the roofing membrane.

Usually if rigid board stock insulation can be removed without breaking it up, it can be reused, especially if the performance will be as good as the new product.

Fiber insulation reuse is more difficult because of the dust infiltration from the fibers.

Built-up roofing systems. Install a layer of sheating between the insulation and the roofing surface so that rerooofing is possible without destroying the insulation.

To be able to reuse the insulation, avoid attachment with adhesive and promote drying of the insulation.

Insulation can be reused as long as it is dry and fairly clean.

Insulation is not usually recycled, but some insulation is made from recycled materials, totally or in part, for example: cellulose (75%), or partially, as fiberglass.

Recycle the scrap insulation.

A continuous air barrier between the insulation and the living space help to keep fiber out of the indoor air.

For chemically sensitive individuals it is important to specify the use of non-offgassing insulation materials.

Indirectly reduce pollutant and greenhouse gas emissions using alternatives both for CFCs and HCFCs agents.

Use alternative expansion agents or manufacture off site, where agents can be collected and recycled.

 COMMENTS

The disposal of the insulation can be a problem because many of the building insulations over the last 20 years have used CFC blowing agents, so the dismantling of those insulation elements has to be done with appropriate control systems.

The claims about health risks correlated to fire retardant chemicals of breathable particles is not a major problem if the insulation is properly installed.

Insulation materials derived from mineral fibers tend to require less embodied energy than the others and they have lower CO2 emissions. The use of insulation however save, many times its embodied energy.

Cellulose and fiberglass can be placed in the trash for disposal. It is a good idea to wear gloves, long sleeves and a face mask when handling insulation.

 SOME DATA

The U.S. market of insulation materials is dominated by fiberglass and plastic foam panels, cellulose accounts for only 4 % of the building insulation market. (8)