Designer Benefits Fire resistance High strength to weight ratio Energy efficiency Sustainable design
Fire Resistance Lightweight concrete masonry has greater fire resistance than normal weight (heavy) c/m of the same equivalent thickness
Extensive testing has established the relationship between fire resistance and equivalent solid thickness for concrete masonry walls. The relationship determines fire endurance based on types of aggregates used and the equivalent thickness of the unit. Calculation Method Equivalent Thickness
Thermal Efficiency R 9.5 SmartWall = R 19 Metal Stud Wall w/ Batt Insulation High R Values With Low Thermal Bridging Through Webs Good Thermal Mass SmartWall Provides
R- Values for Unreinforced Concrete Masonry Walls R Values per NCMA TEK 6.2A & NCMA CMS SmartWall 90 lb/cu ft. Heavy Weight 130 lb/cu ft.
Sustainable Development Lightweight Concrete Masonry and Green Buildings LEED Certification with Lightweight CMU LEED Credits can be earned in 3 categories Materials and Resources Energy and Atmosphere Innovation and Design
Higher Quality Better fire resistance Greater energy-efficiency More design flexibility Fewer shear walls More and larger openings Greater comfort and safety for occupants Increased worker productivity
Initial Wall Costs Medium Weight Lightweight
Thermal Efficiency High R Values With Low Thermal Bridging Through Webs Good Thermal Mass Significant Reduction in Heating & Cooling Costs Lightweight CMU Provides
Total Life Cycle Wall Costs “Typ.” Lightweight Lightweight
Mason Contractor Benefits Lighter weight Increased efficiency More production with less effort Improved competitiveness for masonry More jobs
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Lightweight Concrete Masonry Quality Value Energy Efficient Fire Safe Labor-friendly
Concrete Masonry Units ASTM C90 Classification Light- weight Medium Weight Normal Weight Density<105 pcf >125 pcf 8X8X16 12X8X16 <30 lb <40 lb lb lb lb lb
Productivity vs. Weight
Lower Weight Benefit – less effort Example – 200 units/day MW (32 lb) lb. LW (27 lb) lb. (1000 lb. less / day) (16% reduction)
Lower Weight Benefit – increased efficiency Example – 200 units/day + 15% increase, or 230 units/day MW lb. 200 units/day) LW lb. (190 lb. less / day) (3% reduction) More production with less effort!
Labor Savings Productivity Means Faster Completion >> Quicker Occupancy Lower Direct Labor Costs Lower Contractor Overhead Costs Better Ergonomics w/ Lighter Units Less Fatigue & Fewer Injuries Lower Workman’s Compensation
Increased Productivity Does NOT mean working FASTER DOES mean less fatigue permits the mason to maintain his/her NORMAL pace longer Result: More production with less effort Benefits are even more significant with 10- inch and 12-inch units
Improved Competitiveness Installed wall cost is driven by labor cost 3:1 Labor:block cost As block weight is reduced, installed cost is reduced Some of the cost saving goes to lower bid prices Lower bids make masonry more competitive vs. other wall systems
More Jobs Lower bid prices mean more projects for masonry More projects mean more jobs!
Opportunities Mason Contractors Will recognize productivity benefits Will recognize safety benefits Examples Minneapolis, MN Atlanta, GA Lansing, MI Should reflect reality in bids and Wall Cost Guides
Opportunities Architects Will specify lightweight to get the benefits Will allow lightweight substitution Will look for promised cost savings Examples Minneapolis, MN Atlanta, GA Lansing, MI
Lightweight Concrete Masonry Installation Efficiency Structural Performance Fire Resistance & Durability Life Cycle Energy Savings Lighter, Stronger Concrete Masonry. Outperforms Other Wall Systems:
Lightweight Concrete Masonry Built With… High quality structural grade expanded shale clay or slate aggregate Aggregate is manufactured to optimum gradation for compaction, strength, shrinkage, uniformity of texture
SOLUTIONS Jobs Completed Sooner at Lower Cost Because of Increased Productivity Structural / Seismic Economy Improved Fire Safety & Durability Life Cycle Energy Conservation Lightweight Concrete Masonry walls provide solutions: