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Can you put r19 insulation in a 2x4 wall?

Once the insulation is in the wall and sealed up with drywall, it is not easy to change out. ... Insulation for 2x6 Walls. Best Insulation for 2x4 and 2x6 Wall Studs R-19 6 1/4 Inches (+/-) Two-by-six (2x6) stud walls R-21 5 1/2 Inches (+/-) Two-by-six (2x6) stud walls 4 more rows •

thespruce.com - What Is the Best Insulation for 2x4 and 2x6 Walls? - The Spruce

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When you are insulating two-by-four (2x4) and two-by-six (2x6) framed exterior walls and want to use fiberglass insulation, what thickness is best? The question becomes all more critical because of the permanent nature of wall assemblies and wall insulation. Once the insulation is in the wall and sealed up with drywall, it is not easy to change out. When you add too little insulation, you will have a colder house in winter and a warmer house in summer, as insulation reduces the heat transferring into the house in warmer climates or seasons. Ironically, adding too much insulation—packing in more than is needed—can also result in a colder house than is necessary. Tiny air pockets created within the insulation are what helps keep a home toasty and warm, not the actual strands of fiberglass or paper facing. Striking a perfect balance between too little insulation and too much insulation will keep you and your family warm throughout the winter or cool in summer.

Basics of Faced Fiberglass Insulation, From R-13 to R-19

R-value is a standard unit of measurement for determining, among many things, how effective your insulation will be. The R refers to absolute thermal resistance. Higher R-value numbers mean that the insulating material resists the cold or heat from the outside better. Thickness, density, and type of materials are some factors that contribute to R-value.

Insulation for 2x4 Walls

Most wall assemblies, especially those in older homes, are built with two-by-four (2x4) studs. Since modern two-by-fours are not four inches, the true depth of the wall cavity is 3.5 inches. In most wall applications, you will use R-13 or R-15 kraft-faced fiberglass insulation rolls for these two-by-four stud walls. While rated differently, these two types of insulation are close enough in thickness that they can both fit into modern two-by-four wall systems. Older homes, especially those predating the 1950s, may employ two-by-fours that truly are two inches by four inches. In this case, use R-13 or R-15 fiberglass insulation. There is no 4-inch thick-faced fiberglass insulation in batts or rolls on the common market.

Insulation for 2x6 Walls

Some newer homes may have walls built with 2x6 studs. Use R-19 or R-21 kraft-faced fiberglass insulation for two-by-six (2x6) walls. This combination ensures that the insulation is neither too loose nor too tightly packed within the walls.