![]() For homeowners, an airtight building envelope results in energy savings and increased thermal comfort. Fiberglass and mineral wool insulation is the low-cost solution for homebuilders to meet or surpass code air leakage rate requirements of 3 or 5 air changes per hour depending on climate zone. Air Leakage: As states adopt more stringent energy codes, some builders may experience challenges meeting new mandatory air leakage requirements.The following resources in the table below are just a subset of the many guides available from the Insulation Institute to help you achieve new performance requirements with proven approaches. Energy-Efficient, Cost-Effective Construction with Fiberglass and Mineral Wool InsulationĪs code levels advance, keep informed about innovative practices to meet or exceed code requirements using cost-effective fiberglass and mineral wool insulation. Please check back if your state residential building energy code requirements are not currently available in the table above. State Code Fact Sheets are added on a frequent basis. Select from the list of states below to see their building envelope provisions. Model codes are adopted by most states and municipalities and frequently amended. The model code currently in effect is the 2021 IECC. The International Code Council develops model residential energy codes every three years, referred to as the International Energy Conservation Code (IECC). That’s exactly what we do in the next section.Residential Insulation Codes and Standards ![]() You need to combine it with other soundproofing principles. Layers of drywall is a good example of why you can’t rely only on the soundproofing principle of mass (Berger’s law). Plus, you don’t want to end up with a wall that’s 10 times thicker! To reach an STC 50, how many layers of drywall would you need? While drywall is a more accessible solution, it’s objectively not the best option for noise reduction in a room.Īs you can see, stacking more layers of drywall quickly reaches its beneficial limit.The gain is reasonably interesting when we stack an additional layer (STC +3) but another layer provides less gains (STC +2). The STC of 50 bar is what’s considered good for noise insulation, for instance you wouldn’t hear a loud speed in the adjacent room.ĭividing the cost by the STC gain gives us a figure of $45-90 per STC gained, meaning MLV is a more cost-effective solution. It’s a huge improvement as an STC of 50 is the target in building codes. This would result in a jump from an STC of 42 to 49.
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