Which Insulation Is Better R11 Or R13

The depth of the 2x4 is 3 5 inches which will accommodate r11 or r13 insulation.

Which insulation is better r11 or r13.

The r value per inch for different types of insulation varies depending on the. Either way you have the thermal short circuit from the studs the r13 and r15 are just laboratory numbers for the insulation part of the wall. Improved insulation is a good step toward improving building efficiency particularly since the atlanta based american society of heating refrigerating and air conditioning engineers ashrae increased minimum roof insulation levels in 2007 in its standard 90 1 the first increase in 18 years and if that isn t enough to spur someone into action. Applications r 11 has about 73 percent of the insulative efficiency of r 15 when comparing two of the materials.

Is it better to do a crossing pattern with one layer of r19 between the joists and another layer of r19 laying on top going across them to get r38 or just go with a single thick r38 bat. A recent mckinsey co. Thermal values range from a low of r 4 to a high of r 45. This doesn t mean that one house insulated with r 11 will have 73 percent less.

The r value of insulation indicates its thermal resistance to the flow of heat. If you have steel studs instead of wood then the r15 and r13 walls would be about the same because of high conductivity of the steel. New homes with 2x6 walls will accommodate r19 or r21 insulation. Trying to finish the house under 100k including land.

While there are additional considerations such as venting and moisture problems to take into account when you insulate under floors the united states department of energy recommends an r 25 rating in cold climates and an r 11 in warmer parts of the country. On rigid insulation and insulation bats the r value same calculation applies but the r value on the insulation already calculated the thickness. My most recent house i did had a mix of r15 and r13 due to budget reasons. The label on insulation gives its r value.

However the r value of insulation also depends on proper installation to avoid compressing it. In attics we should use additional layers of. L s if the contract states r15 you should be getting r15 simple as that. R15 should be better than r13 by a little bit in the wall.