What is R-Value?
R-value measures the resistance to heat flow through a material. Metal and concrete transfer heat easily, hence their R-value is very low. Foams and other fibrous insulation materials create dead air pockets, and thus have a higher R-value. R-value is measured in a laboratory, however, and does not simulate real-world conditions. “Effective R-Value” combines standard R-value, plus the ability to seal out air leaks, and can be a better real-world indicator of an insulation system’s performance.
Why is air-sealing so important to a good insulation job?
Air moving through a building carries energy with it, and that energy will have to be replaced with energy from inside the house. Air movement, or convection, is worth up to 40% of total energy losses in a given building. It is easy to see why it is important to defeat this type of energy loss.
What are the advantages of spray foam?
Polyurethane spray foam insulation adheres to most surfaces. That means it seals air leaks while providing insulation. Since spray foam sticks to framing surfaces, it is also good for following vertical and angled surfaces. That makes it a versatile and effective tool in creating a comfortable, energy-efficient home. Last, open-cell foam is an excellent sound-deadening material, and makes buildings quieter.
What is foam insulation safe?
Polyurethane foam insulation, properly applied, is safe and effective. The foam cures quickly, within 24 hours, and we do ask our clients to leave while it cures. After that period, no more gases or odors are released, and the foam is safe enough to eat (but it tastes terrible!).
What’s wrong with fiberglass and cellulose insulation?
Nothing – if you do your prep work carefully! Fibrous insulation does not stop air leaks and can lose effectiveness unless thorough air-sealing is also performed. Cellulose can also settle over time if not installed correctly. Cellulose and fiberglass can be part of a cost-effective strategy for good insulation performance – but only if done by trained professionals who care about the end product.
How does diagnostic testing improve the insulation job?
Testing the building for air leaks during the insulation process improves quality control. Using a blower-door kit and a thermal camera, we can exaggerate the effects of pressure on the house, which also helps us quickly find leakage points. Simply stated, you can’t get a better insulation job than one that is done with the assist of the latest diagnostic tools.
What is the best way to effectively insulate existing buildings?
There are many different products and methods that work well under different circumstances and in many cases the best results come from a combination of methods. There are also products and methods that should NOT be installed under any circumstances for particular applications. A great insulation package should be designed for the individual building.
Is a tight house good for air quality?
We use a blower door test and calculation on your home to determine how tight is too tight. We prefer to go as tight as possible and have our clients install a mechanical ventilation system for best results. If the house is not mechanically vented, however, we will tighten it just enough to keep the air from being unhealthy.
Is a good insulation job more expensive?
On the front end, yes. Installing insulation, particularly in an existing building, is a physically demanding and difficult job. By paying for the best products and skilled technicians who understand building science and care about performance, you can greatly reduce operating costs over time and get the best return on investment. It is one of the few items when building where increased quality will pay the owner back with interest over time.
