Posts Tagged ‘Specification’

BY ANDREW LAVALLEE, FASLA

Warranties on plantings often seem reasonable. Until they aren’t.

FROM THE FEBRUARY 2019 ISSUE OF LANDSCAPE ARCHITECTURE MAGAZINE.

 

Most landscape architects are familiar with specifications about plant warranties. We often apply them without much thought because many consider it to be an industry standard practice. A typical plant warranty, usually lasting one or two years, requires the contractor to replace plantings that have died or appear to show unsatisfactory growth. Standard specification language often seems reasonable and enforceable. Until it isn’t—especially a few months after you thought the job was complete, or worse, after the end of the stated warranty period when the client calls upset that some of the plants are looking bad or are outright dead. Now comes the hard part. Whose responsibility is it if plants don’t succeed? Aren’t the dead or dying plants supposed to be covered by the warranty? If not, what was the warranty actually supposed to cover? These are all good questions that are symptomatic of a larger problem in the landscape industry. (more…)

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BY TRENT OKUMURA, ASLA, AND MICHAEL TODORAN

How to specify complex paving patterns to deflect urban heat from solar exposure.

FROM THE JUNE 2017 ISSUE OF LANDSCAPE ARCHITECTURE MAGAZINE. 

Designers are challenged by climate change as they attempt to mitigate urban heat, but among the biggest factors are the thermal properties of the very building materials they use in new developments, not least their paving surfaces. The material and color of paving make a critical difference in either contributing to or neutralizing heat gain brought by the sun (as do roofs, which typically involve simpler, monolithic material choices). Darker paving creates a hotter microclimate but lower glare, and lighter paving creates a cooler microclimate and higher glare. The sweet spot in specifying paving lies in brokering a balance between thermal and visual comfort.

The crucial metric is solar reflectance (SR), which is a measurement of (more…)

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