Homes-v4 MRc3: Construction waste management

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    Post your questions on this credit in the forum, and see the credit language to review to the LEED requirements.

  • MR Credit 3: Construction waste management

    Intent

    To reduce construction waste generation and to reuse and recycle debris.

    Requirements

    Reduce total construction waste or divert from landfills and incinerators a large proportion of the waste generated from new construction. Use the tables below to calculate the percentage of waste avoided or recycled. Exclude excavated soil, land-clearing debris from calculations. Include materials destined for alternative daily coverMaterial other than earthen material placed on the surface of the active face of a municipal solid waste landfill at the end of each operating day to control vectors, fires, odors, blowing litter, and scavenging. Generally these materials must be processed so they do not allow gaps in the exposed landfill face. (ADCAlternative daily covers are material other than earthen material placed on the surface of the active face of a municipal solid waste landfill at the end of each operating day to control vectors, fires, odors, blowing litter, and scavenging. Generally these materials must be processed so they do not allow gaps in the exposed landfill face.) in the calculations as waste (not diversion). Any waste-to-energy is not considered recycling for this credit.

    Table 1. Baseline waste for LEED reference home

    Bedrooms Conditioned floor area (sf) Waste (lbs)
    1 1,000 4,200
    2 1,600 6,720
    3 2,200 9,240
    4 2,800 11,760
    5 3,400 14,280
    6 4,000 16,800
    7 4,600 19,320
    8 or more Area (sf) * 4.2



    Table 1a. Baseline waste for LEED reference home

    Bedrooms Conditioned floor area (sq. m) Waste (kg)
    1 93 1 905
    2 148 3 048
    3 204 4 191
    4 260 5 334
    5 315 6 477
    6 371 7 620
    7 427 8 763
    8 or more Area (sq. m) * 20.5



    For multifamily buildings, use the project’s floor area for any non-unit spaces, and add it to the floor area of the LEED reference home calculated for each unit.

    Calculate the waste generated by the project according to the following equation:

    Project construction waste = Total waste - (Recycled waste * 0.25)

    To convert volume to weight, assume 500 pounds per cubic yard (296 kg per cubic meter) of mixed construction waste, or use Table 2 to calculate the weights of specific waste products.

    Table 2. Volume-to-weight conversion for construction and demolition debris

    Material LB/CY TONS/CY CY/TON KG/cubic meter
    Aluminum (scrap, whole) 175 0.09 11.1 103.8
    Asphalt 1,380 0.69 1.4 818.7
    Brass (scrap) 906 0.45 2.2 537.5
    Brick (common hard) 3,024 1.5 0.67 1794
    Cardboard (uncompacted) 100 0.05 20 59.3
    Carpet & Padding (loose) 84 0.04 25 50
    Concrete 1,855 0.92 1.4 1100.5
    Copper (scrap) 1,094 0.56 1.8 649
    Dirt (loose, dry) 1,890 0.94 1.1 1121.2
    Drywall 500 0.25 4 296.6
    Glass (broken) 2,160 1.1 0.91 1281.4
    Metal (scrap) 906 0.45 2.2 537.5
    Mixed C&D Debris 900 0.45 2.2 533.9
    Mixed Waste/Trash 350 0.17 5.9 207.6
    Rock (loose) 2,570 1.28 0.78 1631.5
    Roofing (wood shake, shingle) 435 0.22 4.5 258
    Tree Limbs & Stumps 1,080 0.54 1.9 640.7
    Wood (scrap, loose) 330 0.17 5.9 195.7
    Yard Trimmings (mixed) 108 0.05 20 64





    Source: Contra Costa Waste Authority

    Table 3. Points for reducing construction waste below baseline

     

     

     

     

     

     

    Percentage reduction Points
    10% 0.5
    20% 1.0
    30% 1.5
    40% 2.0
     50% 2.5
     60% 3.0




3 Comments

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Amrit Kaur Association for Energy Affordability
Aug 18 2017
LEEDuser Member
15 Thumbs Up

On-site or off-site separation

Project Location: United States

The credit general requirement requires a percentage of material recycled, and a formal report indicating how much was recycled and to what purpose. The detailed step by step guidance has an entry explaining what to do "If the waste management company separates, diverts, and disposes of construction waste" implying as I understand it that this method would be acceptable. However, steps to "Mark and designate containers. Have the waste management company provide separate containers for different types of waste based on its destination ..." and "... Sort and set aside, in a marked and designated area, lumber, plywood... " are also included making it a bit vague if offsite separation is a valid path to meet this credit. Any thoughts?

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Elizabeth Eason LEED Fellow Elizabeth Eason Architecture LLC
Jan 22 2014
LEEDuser Member
266 Thumbs Up

waste management by bedroom vs sf

LEED v4 for homes Table 1:Baseline Waste list waste by both bedrooms and conditioned space but there is no guidance as to when one should use conditioned sf vs bedrooms. For an affordable housing project with a smaller than average square footage vs. bedrooms we would be able to achieve more points if we calculate based on bedrooms. Is this the intent and our option?

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Tristan Roberts LEED AP BD+C, Executive Editor – LEEDuser, BuildingGreen, Inc. May 09 2017 LEEDuser Moderator

Asa Foss at USGBC weighed in on this:

Per rating system language: For multifamily buildings, use the project’s floor area for any non-unit spaces, and add it to the floor area of the LEED reference home calculated for each unit.

What this means is that you should calculate the baseline floor area for each unit (based on Table 1) and then add in non-unit space area. For example if there are ten 2 bedroom units in the building and 1,000 s.f. of common areas, the baseline floor area would be (10 x 1,600) + 1,000 = 17,000 s.f.

The actual size of each dwelling unit doesn’t impact the baseline calculation. However, having smaller units will benefit the project because smaller unit’s will produce less construction waste.

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Aug 18 2017
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