Wall Systems

Cavity Wall: Concrete Block Veneer/Reinforced Cast in Place Concrete

The excellent insulating value and heat capacity of masonry and concrete make this system a good choice for schools and commercial buildings.

Cavity Wall: Concrete Block Veneer/Reinforced Cast in Place Concrete
Coping and dove-tail anchor wall ties Relieving angle and flashing at opening

Recommended Building Types

Benefits

Special Considerations

Definition and Assumptions

Backup: Reinforced 8" thick concrete wall. #5 reinforcement at 12 inches o.c. each direction, 2 mats of steel

9-gauge triangular ties in dovetail slots embedded in concrete. Install the dovetail slots vertically @ 24" o.c. Install ties in the slots @ 16" o.c.

Veneer: Cored modular brick 4" x 2-13" x 8" (nom.).

Insulation: 2 inch extruded polystyrene rigid insulation in 3 inch drainage cavity.

Flashing: Base flashing and weeps.

Mortar: Type N, Portland cement/lime, plain gray.

Joints: Concave tooled.

Regional Variations

Fire Rating (hours)

4 hours

Sound Transmission Class (dB)

STC 62.7

STC=(weight of wall)0.223x21.5

Wall Weight (lb/sq. ft.)

122 lb/sq. ft.

Energy Rating

R-value: 11.89 with 2” expanded polystyrene rigid insulation (See note)

Calculation:

Outside Air =0.17
4 inch block =1.19
Air Gap =0.97
Insulation =8.00
Gyp board =0.45
8 inch concrete =0.88
Interior Air =0.68
Total =11.89

R-value: 13.89 with 2” extruded polystyrene rigid insulation (See note)

Calculation:

Outside Air =0.17
4 inch block =1.19
Air Gap =0.97
Insulation =10.00
8 inch concrete =0.88
Interior Air =0.68
Total =13.89

Note: The type of rigid insulation you install affects the wall’s insulating capacity (the R-value). Polyisocyanurate insulation gives you 8.0 R per inch (12.0 R for 1.5" or R16 for 2"). Expanded polystyrene insulation is worth 4.0 R per inch (6.0 R for 1.5" or 8 R for 2"). Extruded polystyrene yields 5.0 R per inch (7.5 R for 1.5" or 10 R for 2"). Use either thicker insulation or more expensive polyisocyanurate to achieve a higher energy rating.

Green/LEED Rating

Design Tips

Construction Tips