Insulation and wall thickness requirements

1. What thickness of insulation can be used?
2. What ist the minimum thickness of a typical face wythe?
3. What is the structural wythe thickness?

 

 

 

Insulation thickness values ranging from 25 mm (1 in) to 250 mm (10 in) have been used successfully. The minimum recommended thickness is 38 mm (1.5 in) for horizontally poured panels and 50 mm (2 in) for vertically poured walls. A thickness greater than 75 mm (3 in) is typically built-up from multiple layers of insulation. The required thickness may be determined using a thermal analysis that considers the building’s use, location and vapor drive potential.

 

 

What ist the minimum thickness of a typical face wythe?

A minimum thickness of 50 mm (2 in) is recommended. This will provide 13 mm (.5 in) cover over the end of the shorter (MS) connectors. The thickness of the wythe should be increased from this minimum by adding the depth of any architectural reveals or rustication lines.

 

 

What ist the structural wythe thickness?

The thickness will vary as a function of the construction method and building loads. For factory cast applications, the panel manufacturer must be consulted. For tilt-up applications, an initial thickness can be estimated by multiplying the un-braced panel length (in inches) by the inverse of the slenderness ratio of 50. The final thickness must be determined by the engineer of record considering erection, gravity and lateral forces.