Project of the Week for April 2, 2018: HDB BLK 667B, Singapore

April 2, 2018 at 10:43 am Project Week HDB BLK 667B Singapore

Punggol, Singapore
6,997 sf Greenroofs Project Week HDB BLK 667B Singapore Project of the Week: April 2, 2018

Known for its credo “City in the Garden,” beautiful Singapore is an island nation where land is at a premium.  We’ve had the privilege to visit twice, in 2010 and 2015, and continue to be amazed at the sheer number of living roofs and walls on a wide variety of building typologies.

Since the great majority of Singaporeans live in highrises, the city-state’s public housing authority has greened as many multi-family structures as possible.  New ones are now designed with greenroofs, and when feasible, older facilities are refurbished with lightweight systems. Project Week HDB BLK 667B Singapore

Mini Description & Details

Singapore has been actively greening its urban landscape for many years with sky gardens, living walls, and world-class gardens.  The Housing & Development Board (or HDB) is Singapore’s public housing authority and today, more than 80% of the population is living in HDB’s 1 million plus flats in 23 towns across the island.

Located in the northeast region of Singapore, Punggol was developed to be its first eco-town. Project Week HDB BLK 667B Singapore

The HDB BLK 667B is a retrofit of three highrise residential blocks at the Punggol housing estate whose rooftop equipment and piping had been covered by a “second” roof of sorts.  Made of large concrete tiles, they were laid in shingled fashion, and the Town Council wanted to cover them with greenery to improve visual appeal and reduce interior temperature.

Because the only access to the 23rd floor rooftop was up one staircase from the elevator, plus the equipment obstacles, the project required a system that was light and clean to transport and easy and quick to install, with minimal maintenance in the long term. Project Week HDB BLK 667B Singapore Project Week HDB BLK 667B Singapore

Designed and installed by Xero Flor Singapore, the mineral wool-based XF309 Light buildup now covers the large concrete shingles.  Perfect for retrofits, the roll format soil-less system weighs only 33 kg/m2 (or 6.6 psf) when fully saturated, which is one of the lightest weight systems on the market. Project Week HDB BLK 667B Singapore Project Week HDB BLK 667B Singapore


The pre-vegetated Xeroflor mats contain small low-profile tropical succulents including Sedum sarmentosum, three types of Portulaca, and Plectranthus prostratus.  Pre-grown in local nurseries to a minimum vegetation coverage of 80%, they provide an instant green effect with seasonal visual interests.  Shade cloth was used to cover the entire green roof initially to allow the plants to root firmly into the water retention fleece underneath.

The colorful lightweight Xeroflor/ Low & Bonar green roofs add greenery, lower the interior temperature, reduce reflective glare and create a pleasant view for the neighboring blocks. Project Week HDB BLK 667B Singapore

Year: 2016
Housing & Development Board (HDB)
Punggol, Singapore
Building Type:
Multi-Family Residential
Single Source Provider
6997 sq.ft.
Accessible, Private Project Week HDB BLK 667B Singapore

Designers/Manufacturers of Record:

Green Roof Designer: Linus Wong, Xero Flor Singapore
Installation Team Leader: Anita Wong, Xero Flor Singapore
Architect: ADDP Architects LLP
Green Roof System: XF309, Xeroflor/ Low & Bonar
Green Roof Manufacturer: Xeroflor/ Low & Bonar Project Week HDB BLK 667B Singapore

All the Info:

View the HDB BLK 667B project profile to see ALL of the Photos and Additional Information about this particular project in The International Greenroof & Greenwall Projects Database. Project Week HDB BLK 667B Singapore

Project of the Week Video Feature

Watch the HDB BLK 667B Project of the Week Video below or see it on our GreenroofsTV channel on YouTube: Project of the Week 4/02/18 video photo credits: Courtesy of Xero Flor Singapore; 1 bishan park panorama 2012.jpg By chensiyuan (Self-photographed) GFDL or CC BY-SA 4.0-3.0-2.5-2.0-1.0, via Wikimedia Commons; Punggol Waterway Park 2013.jpg By Erwin Soo licensed under the Creative Commons Attribution 2.0 Generic license, via Wikimedia Commons; Sedum sarmentosum 01.JPG By Dalgial, own work, licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license, via Wikimedia Commons; and © Linda S. Velazquez.

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By Linda S. Velazquez, ASLA, LEED AP, GRP Publisher & Greenroofs & Walls of the World™ Virtual Summits Host