# What is the R-value of a wood 2×4?

## What is the R-value of a wood 2×4?

R-Value Table – English (US) Units

Material R/ Inch hr·ft2·°F/Btu R/ Thickness hr·ft2·°F/Btu
Poured Concrete 0.08
Soft Wood Lumber 1.25
2″ nominal (1 1/2″) 1.88
2×4 (3 1/2″) 4.38

## What is the R-value of a stud wall?

For example, soft pine wood studs typically have an R-value per inch of 1.25. This means the U-value per inch would be 1/1.25 = 0.8. In summary, you can calculate the effective R-value of a wall assembly by taking the sum of the individual R-values of each “layer” of the wall and adjusting it by a framing factor.

What is the R-value of a 2×4 wall?

Fiberglass and rock wool batts—2×4 walls can hold R-13 or R-15 batts; 2×6 walls can have R-19 or R-21 products. Generally, batt insulation is the least expensive wall insulation material but requires careful installation for effective performance (see page 4).

Does wood have an R-value?

The R-Value of Wood A material’s thermal resistance or resistance to heat flow is measured by its R-value. In a solid log wall, the logs provide both structure and insulation. The R-value for wood ranges between 1.41 per inch (2.54 cm) for most softwoods and 0.71 for most hardwoods.

### What is the R-value of a wood stud?

The r-values of wood wall studs are linear and are measured in terms of inches. However, wood wall studs generally lower the r-values of your insulation. The r-values of wood are specified as 1.25 per inch.

### What is the R-value of a 2×6 wall?

When blown or sprayed cellulose insulation is used, the R-value is typically R-20 for 2×6 walls.

What is the R-value of a 2×6 board?

R-19 to R-39
A 2×6 wall can be insulated from R-19 to R-39. Material selection, density, and cavity depth all play a role in the “cavity” R-value of a wall.

Is R-19 insulation for 2×6 walls?

With a R-Value of R-19 the insulation will fit into any 2×6 construction board. Kraft Faced. This insulation has a moisture barrier that is used for exterior wall, floor, or attic This insulation is perfect for 8 foot floor or walls.

#### What is a good R-value for exterior walls?

R-13 to R-23
Typical recommendations for exterior walls are R-13 to R-23, while R-30, R-38 and R-49 are common for ceilings and attic spaces. See the Department of Energy’s (DOE) ranges for recommended levels of insulation below.

#### What is the thickest insulation I can put in a 2×4 wall?

Insulation for 2×4 Walls 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.

What is the best R-value for 2×6 walls?

Use R-19 or R-21 kraft-faced fiberglass insulation for two-by-six (2×6) walls. This combination ensures that the insulation is neither too loose nor too tightly packed within the walls.

What is the R value of wall assembly?

Wall Assembly R-Value EXAMPLE: Component R-value Wall – Outside Air Film 0.17 Siding – Wood Bevel 0.80 Plywood Sheathing – 1/2″ 0.63 3 1/2″ Fiberglass Batt 11.00 1/2″ Drywall 0.45

## What is the R value of hardwood?

R-value in Wood. Per-inch, R-value of softwood is 1.41. In hardwood, it is 0.71. Logs of around 6 inches would then have an R-value that is about 8. This value, when compared to other insulating materials, is actually pretty low; it is so low that it is below many industry standards.

## What is the R-value of wood?

What Is the R-value of Wood? 1 R-value Explained. The R-value of a substance is a number that indicates how much resistance that substance has to heat flowing through it. 2 Other Factors That Affect R-value. R-value can sometimes be deceiving. 3 R-value in Wood. Per-inch, R-value of softwood is 1.41. 4 Other Properties of Wood.

What materials are used in a R value table?

R-Value Table Material R/ Inch R/ Thickness Insulation Materials Fiberglass Batt 3.14 Fiberglass Blown (attic) 2.20 Fiberglass Blown (wall) 3.20 Rock Wool Batt 3.14 Rock Wool Blown (attic) 3.10 Rock Wool Blown (wall) 3.03 Cellulose Blown (attic) 3.13 Cellulose Blown (wall) 3.70 Vermiculite 2.13 Air-entrained Concrete 3.90 Urea terpolymerfoam 4.48