FAQ - Devere Insulation Home Performance
Why do I need to seal my attic if I’m adding insulation? 
Fibrous insulations (fiberglass and cellulose) are insulators, but not air barriers. As a result, they allow air to move through them.  This loss of conditioned air results in increased energy use. Air sealing stops the escape of air from the home.

Where are the big leaks in my attic?
Typically, the biggest attic leaks are found
  • where the walls meet the attic floor
  • above drop ceilings and overhangs
  • behind attic walls
  • around  recessed “can” lights, plumbing stacks, electrical wires
  • around attic hatches or doors
  • around chimneys or flues, and duct chases

Can I over seal my home or make it too tight?
A certain amount of fresh air is needed for good indoor air quality and there are specifications that set the minimum amount of fresh air needed for a house.While it is possible to seal a house too tightly, it is very unlikely especially when a home has proper mechanical ventilation.  

What is the difference between open cell and closed cell foam?
Open Cell Spray Foam Insulation - Devere Insulation Home Performance
Open cell spray foam insulation is 0.5 pounds per cubic foot. It is made up of tiny cells of foam that are not completely closed. The cells are broken and air fills all of the “open” space inside of the material. This makes the foam have a soft feeling. Open cell foam has an r-value of 3.4 to 4.5 per inch.

Closed Cell Spray Foam Insulation - Devere Insulation Home Performance
Closed cell spray foam insulation is 2.0 pounds per cubic foot. The cells are closed and packed tight together. They are filled with gas that helps the foam rise and expand. Closed cell foam is a greater insulator due to its denser properties. Closed cell foam has an r-value of 5.4 to 7.2 per inch.

How does spray foam differ from traditional fiberglass insulation?
Fiberglass insulation adds a thermal barrier. Spray foam insulation has the added benefit of sealing air leaks - one of the biggest contributors to energy loss and high energy bills. It is a two-in-one product that provides dual energy-saving benefit.

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