Defining green roof lingo

Green roofs succeed when they achieve the ideal balance of weight, water infiltration and soil balance to sustain desired plantings. Here are some key performance areas for soils and green roofs that JBC applies in the design process: Infiltration rate: The amount of permeability in the soil. The higher the infiltration rate, the faster water …

Current code activity

By Juli Case Flammability specification revision NFPA 701 is one of the most commonly cited U.S. flammability standards in the specialty fabrics industry, and is entering into its 2010 revision cycle. Proposals were due in May 2008, with revision work taking place throughout 2009. the revision cycle includes an opportunity to comment on proposals. Contact: …

Green roof and wall system types

The following roof systems offer different advantages and cost levels. Modular: A green roof with drainage layers, filter cloth, growing media and plants already prepared in movable, interlocking grids. Loose laid: Same as modular, but the grids are not necessarily interlocking. Built-up: A green roof comprised of individually constructed layers, including waterproofing, drainage board, root …

Aquaquest living wall technical data

Source: Randy Sharp, Sharp & Diamond Landscape Architecture Inc. Living walls can be designed and planted for color and variety throughout the year. In the spring at Aquaquest’s wall, the wintergreen and evergreen huckleberries flower with white blossoms that stand out against the bright green foliage on the spiny wood fern and the licorice ferns. …

Connection details

When forces converge within a tension structure, the connections between each of the three systems —fabric membrane, supporting structure and tensioned cables— are critical to a successful design. The conditions of transferring loads from one of these systems to another can be grouped into edges, linear supports, point supports, corner supports, masts and base plates. …

Print production specifications

Click on the image on right to enlarge. General information The Industrial Fabrics Association International (IFAI) provides these specifications to ensure quality standards in advertisement print reproduction and the integration of digital content into our publications. IFAI publications are printed completely with computer-to-plate technology (CTP). Please do not send film. Digital specifications IFAI publications are …

Terms to know when working with green roofs

By Frank Edgerton Martin Here are some terms to be familiar with when working with green roofs. Overburden The technical term for everything installed to cover the waterproofing membrane. When writing specifications, designers refer to the “vegetated overburden” in lieu of “green roof” Intensive and extensive green roofs Intensive</strong A green roof with deeper soil …

Lag screw formulas

The following formula is an example of the type used to determine the maximum allowable withdrawal loading on the wood when using a lag screw: p = 1800 D0.75 G1.5 Here p is the allowable load, in pounds per inch of embedment of the threaded portion of the screw. D is the shank diameter, in …

Approximate allowable max. tensile load in threaded fasteners loaded in tension and shear

This table shows the approximate allowable max. tensile load in threaded fasteners loaded in tension and shear. Notes: Above allowable tensile loads are based on Ft=26-1.8fv≤20, where Ft is the allowable tensile stress, fv is the actual shear stress. Fu, the ultimate strength of the fastener, is assumed to be 40 k.s.i. The fastener is …

What’s a wick drain, and how do they work?

The term wick drain is a misnomer because these clever devices do not actually wick away water. Wick drains, more accurately called prefabricated vertical drains (PVDs), consist of synthetic band-shaped material that is installed vertically into soft soils to accelerate preconstruction preloading programs. The drains are approximately 102mm wide by 6mm thick and are composed …