10 Concrete Wall R Value

R inch r thick ness insulation materials fiberglass batt 3 14 fiberglass blown attic 2 20 1 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 terpolymer foam 4 48.

10 concrete wall r value.

Insulation ratings can be improved by adding more layers of insulation. The r value of an uninsulated 8 inch thick basement wall built using normal weight concrete is 1 35 based on data from the 1993 american society of heating refrigeration and air conditioning engineers handbook. By doubling the thickness of the wall to 16 inches the r value only increases by 0 50. A wall s thermal resistance or its r value is its ability to slow the transfer of heat from one side to the other.

If we increase the r value of the wall to r14 by. I am trying to determine r values for poured in place concrete walls both above grade and below grade at varying thicknesses. Achieving greater r values in attics. Insulation level are specified by r value.

F btu 1 23 m k w an estimate of the building envelope energy use for this structure is approximately 27 800 btu ft 87 7 kwh m as shown in figure 1. You can mix the type and material of insulation too. The walls have rebar of various diameters imbedded throughout. 102 152 203 254 and 305 mm backup wythes and a 4 in.

The higher the r value the better the thermal performance of the insulation. 102 mm hollow unit concrete masonry veneer. R value tables traditional three web units. Concrete block wall with air in cavities r 2 0.

Concrete block makes a cost effective and structurally sound wall but it has. The reason that it is important to make a good estimate for the current r value for uninsulated spaces is that small changes in r values result in large changes in heat loss when the total r value is low. As we said before the r value measures the thermal resistance of a material. R value is a measure of insulation s ability to resist heat traveling through it.

The ideal attic insulation r value is different than the ideal wall insulation r value. Table 2 presents r values of uninsulated concrete masonry cavity walls with 4 6 8 10 and 12 in. Make sure your home is properly insulated in all these locations. The walls i am working with vary from 6 inches thick for one wall and 10 12 and 14 inches thick for other walls.

If this school is built using single wythe concrete masonry walls with cell insulation only and a resulting wall r value of 7 hrft 2.