How does it save energy?

The 'u' value is the rate at which heat passes through a wall, the higher the 'u' value the quicker the heat escapes through the wall. The figures below show some typical 'u' values for a standard cavity wall before and after installation of Warmfill Silver

Existing Building

Type of Construction
70mm Cavity
Before Insulation
u. value
After Insulation
u. value
Brick/Cavity/Brick 1.68 W/m 2/0 C 0.39 W/m 2/0 C
Brick/Cavity/Concrete Block 1.55 W/m 2/0 C 0.37 W/m 2/0 C
Brick/Cavity/Clinker Block 1.40 W/m 2/0 C 0.35 W/m 2/0 C
Brick/Cavity/Insulation Block 1.05 W/m 2/0 C 0.32 W/m 2/0 C

 

Typical (examples) New Build

Warmfill Silver u Values change when used on various constructions with varying cavity widths
 
Type of Construction
Cavity Width
Value w/m 2k
New Build Brick/Medium
Block & Plaster
100 mm
110 mm
120 mm
.27
.26
.24
New Build Brick/Light
Block & Dabs
100 mm
110 mm
120 mm
.26
.25
.23