Protecting the precious environment
Construction: Cyclical resource use and waste reduction initiatives

#Cyclical resource use#Pollution prevention and the local environment

Appropriate treatment and recycling status of construction waste

Construction waste treatment status

In fiscal 2018, the volume of construction waste discharged was 431,100t (76.2%) from new building construction work and 134,400t (23.8%) from demolition work, totaling 565,500t. This was an increase of 27,200t (or 5.1%) from fiscal 2017.

Trends in volume of construction waste discharged
Breakdown of construction waste (FY2018)

* Volume per unit of net sales is based on new building construction work.
* Volume per unit of net sales excludes the portion for recycling treatment facilities (wood waste and waste plastics); only data of mixed waste has been collected.

Recycling status of construction waste

In fiscal 2018, the volume of recycled construction waste was 406,200t (75.4%) from new building construction work and 132,600t (24.6%) from demolition work, totaling 538,800t (95.3%). In demolition work, 2t of refrigerant chlorofluorocarbon (CFC) and 0.3t of halon were collected for destruction process and 65.1t of asbestos was properly processed and disposed of.

Trends in recycling of construction waste
Breakdown of waste treatment by item (FY2018)
#Cyclical resource use#Pollution prevention and the local environment

Waste reduction initiatives

Recycling of waste plasterboards

Recycling by manufacturers (wide-area certification system) refers to a system in which product manufacturers are authorized by the Minister of the Environment to collect and recycle their products that became wastes (product offcuts). The system ensures proper recycling of wastes.

At Haseko, for example, we collect plasterboards from construction sites and separates them into plaster powder and paper at other manufacturers’ plants. Plaster powder is recycled into raw materials of plasterboards, and paper is recycled into raw materials for paper production.
In fiscal 2018, we recycled 6,331t of waste plasterboards.

Yard for separating waste plasterboards (protected from rain by roof and sheets)

Reducing cardboard packaging materials through the use of reusable boxes

At construction sites in the Tokyo region, we have collaborated with manufacturers so that downlight appliances for private areas of condominiums would be delivered to worksites after having lightbulbs pre-installed at their factories. We also promote the reduction of packaging cardboard through the use of reusable boxes upon delivery.

At construction sites in the Kansai region, switches and outlets to be installed in private areas of condominiums are no longer packaged individually in cardboard boxes for delivery; instead, the quantity required for each condominium unit is allocated in reusable boxes at the time of shipment from the factory and delivered in those boxes to worksites in an effort to reduce packaging material and save labor.

Returnable packaging for water heaters
Reusable boxes to deliver power distribution boards for each condominium unit
Lightbulbs installed to downlight appliances before delivery to worksites

Reducing rainforest-sourced materials and environmental burden

Plywood for concrete formwork is made of materials sourced from rainforests. Loss of vast rainforests means losing a huge CO2 absorber, so there is an urgent need to preserve them also from the viewpoint of biodiversity.

Construction divisions have been promoting the use of precast concrete material in hallway and balcony balustrades and ends, decorative columns, outside staircases and floorboards, while adopting the ALC construction method for non-bearing walls. In addition, the construction divisions have been reducing plywood for formwork made of rainforest-sourced materials through such efforts as adopting steel forms and even plastic forms where feasible. In fiscal 2018, use of rainforest-sourced materials was reduced by 281,035 square meters (reduction rate: 15%) in the Tokyo region and by 361,870 square meters (reduction rate: 33%) in the Kansai region.

Use of industrial products and alternative forms in place of wood forms has also reduced offcuts generated at the time of processing as well as the number of concrete mixer trucks, translating into lower volumes of industrial waste and CO2 emissions.

Balcony PCa
Non-bearing slab wall ALC
#Cyclical resource use#Pollution prevention and the local environment#Supply chain

Execution division's educational initiatives

Education for new employees

To train new recruits with an engineering background before assigning them to duties, we conducted a training session for separating industrial waste generated at a construction site and took them on a tour of inspection of an intermediate processing facility of industrial waste.

At the construction site, we held an on-the-job training session on the generation status of industrial waste and management by separation of industrial waste, and at the intermediate processing facility, participants saw the waste treatment process and learned the importance of resources and the significance of recycling.

On-the-job-training of waste separation at a worksite
Tour of inspection of intermediate processing facility

Education of skilled workers at construction sites

In order to promote the separation and recycling of waste discharged at construction sites, we conduct waste separation education targeted at our business partners’ skilled workers as necessary. We also put efforts into education to improve waste separation and recycling, such as actually sorting the generated waste during morning assemblies and simultaneous cleaning, and holding training sessions based on Haseko’s original educational materials on waste separation and recycling.

Education on waste separation at morning assembly
Waste separation during simultaneous cleaning
#Cyclical resource use#Pollution prevention and the local environment#Supply chain

Green procurement initiatives

Initiatives to select materials with smaller environmental footprint is called green procurement. As part of our green procurement initiatives, we investigated 14 green procurement materials for FY2018 and counted their quantity.

Going forward, we will review and add green procurement materials as necessary in consideration of green procurement results, social trends and other factors.

Item Unit FY2014 FY2015 FY2016 FY2017 FY2018
Steel for electric furnace
(reinforcing steel)
1,000t 233 211 194 203 228
Blast furnace cement and
freshly-mixed concrete
1,000m3 254 207 255 176 225
Recycled tiles 1,000m3 434 440 310 302 356
Recycled plasterboards 1,000m3 4,570 6,143 4,054 4,566 4,765
Particle boards
(double flooring)
1,000m3 147 209 96 189 255
Styrene materials
(wall-backing packing)
m3 368 375 325 395 419
Water-saving toilet bowl 1,000 units 16 16 18 16 20
Rooftop and wall greening 1,000m3 5 4 9 11 11
Permeable paving 1,000m3 16 20 21 16 26
SUS piping (water supply piping in communal areas) t 99 105 98 84 53
Hf inverter lighting equipment 1,000 units 15 18 24 39 50
Long vinyl sheets 1,000m3 198 196 297 280 383
Extruded polystyrene foam 1,000m3 4 4 4
CFC-free urethane foam 1,000m2 389

* Data for extruded polystyrene foam since FY2016 and CFC-free urethane foam since FY 2018.

Blast furnace slag cement type B

Blast furnace slag cement type B, which is superior against cracks and in terms of chemical resistance, is mainly adopted in concrete piles. CO2 generated during cement production is the largest in volume during the manufacturing process of clinker, an interim product of cement. The production of blast furnace slag cement involves mixing large volumes of blast furnace slag fine powder into normal cement, which leads to a much lower composition ratio of clinker than in normal cement, and in turn, reduction of CO2 emissions.

In fiscal 2018, adoption of blast furnace slag cement type B was 225,000 cubic meters, resulting in the reduction of CO2 emissions by approx. 25,200t.

Concrete piling

Particle boards

Wood waste generated at construction sites is carried into a recycling facility and recycled into particle boards. The recycled particle boards are used at worksites once again, thus realizing cyclical material recycling. Compared to the process of manufacturing particle boards from raw wood, it not only leads to lower CO2 emissions but also helps protect forests, reducing the environmental burden.

In fiscal 2018, particle boards delivered totaled 3,060t, resulting in the reduction of CO2 emissions by 2,028t.

Waste wood→Woodchip→Particle boads