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birth defects, or other
reproductive harm are
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Rigid Fiber Board Insulation
Rigid fiber or fibrous board insulation consists of either fiberglass or mineral
wool and is primarily used for insulating air ducts in homes. It is also used when
there's a need for insulation that can withstand high temperatures.
Fiber or fibrous glass duct board insulation is manufactured from resin-bonded,
inorganic glass fibers. These duct boards are available with coated or faced
airstream surfaces. The outside surface of the boards typically incorporates a
factory-applied reinforced aluminum air barrier and water vapor retarder. They
come in a range of thicknesses from 1 inch to 2.5 inches. The boards can
provide an R-value of about R-4.0 per inch of thickness.

Installation
The installation of fiber board insulation in air ducts usually requires an HVAC
contractor.
HVAC contractors fabricate fiber board insulation into ducts either at their shops
or at the job sites.
On exterior duct surfaces, they can install the insulation by impaling it on weld
pins and securing with speed clips or washers. They can also use special weld
pins with integral-cupped head washers. Unfaced boards can then be finished
with reinforced insulating cement, canvas, or weatherproof mastic.
Faced boards can be installed in the same way. Joints between boards are
sealed with pressure-sensitive tape or glass fabric and mastic.


Sprayed-Foam and Foamed-In-Place Insulation
Liquid foam insulation materials can be sprayed, foamed-in-place, injected, or
poured. Their ability to fill even the smallest cavities gives them twice the R-value
per inch than traditional batt insulation.
Types of Liquid Foam Insulation
Today, some foam insulation consists of materials similar to those found in
pillows and mattresses. Also, most foam materials can now be used with
foaming agents that don't use chlorofluorocarbons (CFCs) or
hydrochlorofluorocarbons (HCFCs), which are harmful to the earth's ozone layer.
Some types of available liquid foam insulation materials include these:

•        Cementitious
•        Phenolic
•        Polyisocyanurate
•        Polyurethane.

Some less common types include Icynene foam and Tripolymer foam. Icynene
foam can be either sprayed or injected, which makes it the most versatile. It also
has good resistance to both air and water intrusion. Tripolymer foam—a water-
soluble foam—is injected into wall cavities. It has excellent resistance to fire and
air intrusion.
Urea-formaldehyde (UF) foam was used in homes during the 1970s and early
1980s. It is no longer available for residential use because of health-related
concerns.

Installation
Liquid foam insulation—combined with a foaming agent—can be applied using
small spray containers or in larger quantities as a pressure-sprayed (foamed-in-
place) product. Both types expand and harden as the mixture cures. They also
conform to the shape of the cavity, filling and sealing it thoroughly.
Slow-curing liquid foams are also available. These foams are designed to flow
over obstructions before expanding and curing, and they are often used for
empty wall cavities in existing buildings. There are also liquid foam materials that
can be poured from a container.
Installation of most types of liquid foam insulation requires special equipment
and certification. Therefore, you'll probably want a certified insulation installer to
do it.

Following installation, an approved thermal barrier—such as drywall—must
cover all foam materials. Also, some building codes don't recognize sprayed
foam insulation as a vapor barrier, so installation might require an additional air
barrier, like polyethylene or some other vapor retarder.
Costs

Liquid foam insulation products and installation usually cost more than
traditional batt insulation. However, liquid foam insulation also forms an air
barrier. This can help eliminate some of the other costs and tasks associated
with weatherizing a home, such as caulking, applying housewrap and vapor
barrier, and taping joints. When building a new home, this type of insulation can
also help reduce construction time and the number of specialized contractors,
which saves money
What you
Need to
know about
INSULATION