When building an energy-efficient, net-zero home in Missouri, it is vital to eliminate or significantly reduce energy loss with a high-performance thermal envelope. Spray foam insulation, an alternative to traditional building insulation such as fiberglass, saves on energy costs and dramatically lowers utility bills.
Studies by the US Department of Energy show that 40% of a home’s energy is lost as the result of air infiltration through walls, windows, and doorways. Buildings treated with spray foam insulation typically insulate as much as 50% better than traditional insulation products.
Spray Foam insulation blocks all three forms of heat transfer:
- Conductive heat transfer
– The flow of thermal energy through a substance from a higher to a lower temperature area. - Radiant heat transfer
– The process by which heat energy in the form of lightis emitted more strongly by warm surfaces and absorbed by other materials, especially those of low IR reflectivity. - Convective heat transfer
– Heat whichis created elsewhere thatis transported utilizing a fluid, such as water or in our case air.
How it Works
Spray foam insulation has a two-part spray process, starting with two 55 gallon drums – one with urethane material, and water-based blowing agent in the other.

Open Cell Foam –
- Air barrier, but water vapor permeable
- Primarily used on interior applications against the wood to prevent condensation from being trapped against the framing.
Closed Cell Foam –
- Air and water vapor barrier
- Primarily used on exterior applications where a vapor barrier
is needed , i.e., crawlspaces - Approximately 2X cost of open-cell foam
Spray Foam Insulation Pros & Cons
The Good
- Excellent air sealing
- Easy retrofit in the attic
- Places insulation at the roof deck
- puts mechanicals inside conditioned space
- Keeps
loft within 8-10° of living space - Reduces mechanical sizing requirements
- Approximately 25% energy reduction
The Bad
- Contains polyurethane
- Off-gasses VOCs for
a couple of days - When applied to full-fill walls, can
result in lots of landfill trash - More costly than batt insulation
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