Retaining Wall R-value Calculator

This page calculates the R-value of retaining walls. For floor R-value calculations please click here.

Please select the floor type:
Suspended timber or concrete floor
Slab on ground floor
Retaining walls

The retaining wall R-value consists of the R-value of the wall itself and the R-value of the ground behind the retaining wall.

If the retaining wall consists of a simple construction, i.e. a concrete or masonry block wall with no insulation or with a complete layer of insulations, for example a polystyrene sheet, the complete retaining wall R-value can be calculated with the calculator on this page.

If the wall is more complex, i.e. timber framed with concrete backing or similar, you need to calculate the ground R-value here and the wall structure R-value on the Design-Navigator Floor, Wall and Roof R-value Calculator page. To get the complete retaining wall R-value you simply add the ground R-value and the wall structure R-value.

Note: The actual retaining wall R-values are quite complex to estimate. This calculator provides an approximate value only.

Retaining wall area [m²]
Retaining wall length [m]
External wall thickness [mm] (defaulted to 200mm for retaining walls. That represents the typical retaining wall thickness.)
Soil conductivity [W/m ºC]

Insulation:
Insulation R-value [m² ºC/W]
Edge insulation width [m]
Edge insulation height [m]

The specified retaining wall has an R-value of m² ºC/W.