Post 476 –by Gautam Shah



The word Trellis derives from trilicius, (tri- + licium = thread), referring it to a woven entity ‘with three threads. A trellis in old French as treliz simply refers to a fabric of open texture. Basket or matt weave is interpreted as construction where two or more threads of grass, weeds, vines, twigs, bamboo slivers or green cane slip are used in both the warp and filling direction. And so Trellis may have meant an open-mat like weave. These may have been used as screen cover over the gaps or openings like doors and windows, to prevent entry of stray animals rodents, flies, and mosquitoes, to reduce the pressure of heavy winds, or, control the brightness.

Garden Trellis


Matts have Three forms, soft ones have no edge reinforcement and so can be folded in either of the direction. Matts with reinforcement at the ends (usually warp ends) can be rolled up after hanging, whereas with stiff support on all four edges, it forms a panel. Trellises are referred to “as panels, made from interwoven wood pieces”.


Gitterpavillon_SanssouciTreillage is French word (Middle French, from treille or vine arbor) for latticework used for supporting vines and green foliage. Lattices have been used in agriculture for supporting plants, and protecting them in inclement weather. During Renaissance period lattices were key elements of garden scapes. These were used for gates, fences, tree guards and as support structures for pots and vases. For garden scapes metal trellises replaced the wood trellises, post-industrial age. A metal structure gets very hot and fast, burning out the climbers or plants, so wood has continued to be a compulsory requirement.


Cheval de frise, a medieval latticed defense for anti-cavalry measure with many projecting long iron or wooden spikes or spears.

Stone Trellis Cage

Lattices are architectural as well as interior space elements. These are of essentially of Five types.

1 Protective lattices against height related hazards, within openings, spiked one against unauthorized entry, and as spark arresters in fire places.

2 Space dividing elements such as fences, guard rails, reja (screens to enclose a chapel or a tomb in a church), partitions, and as a translucent barrier. Indian balconies, Zarokha and Mid-East countries traditional window form, Mashrabiya, use grills to occlude vision from outside and as a sun shading device.

Iron grating over window Venice

3 Roofing elements are called Pergola or roof screens. Indian urban houses in crowded localities have central open cut spaces called Chowk, and these are covered with a lattice structure at every floor level. These are used for seating, sleeping, craft work, drying clothes, etc. besides providing lighting and ventilation to every floor. Pergolas are used to control the illumination and cutoff sunlight during specific daily and seasonal schedules.

Puerto Rico Convention Center San Juan

4 Flooring elements of lattices are used in walkways and catwalks of warehouses, performance stages. Floor lattices in doors screen dust off the shoes soles. Floor lattices do not allow cattle to enter or leave an estate.

5 Structural Lattices are mainly used for reducing the mass (dead weight). Girders are castrated to increase the depth for the same mass. Brides, towers, pylons, Vierendeel Girders.

Game Nets



Post 226 – by Gautam Shah



Wrought Iron lattices have been used primarily over windows, doors and other gaps. Latticed structures of wrought iron are used for balconies, as space dividers, church screens, vine climbers, stair railings, estate gates and barricades, frames for furniture items, lintels, beams, brackets, columns and for garden structures like orangeries and pavilions.

Iron forming reflects man’s innovative and craft skills. It has been a very difficult material to work with, as it presents different behaviour in its various forms. Yet, it has been cast, resealed, joined, spliced, chased and engraved. It has been reformatted with hot and cold treatments. Wrought iron has been used for household utilities, tools, vessels, arms, building elements, architectonic entities, decorative items and statuettes. It has replaced wood for its stability, strength and malleability.



Before the Middle Ages, wrought iron was used primarily for weapons, tools and utilities that only could be made with a metal. Unlike Cast iron, Wrought iron has a lower carbon content. It is stronger, non-brittle, and could be forged to any shape, and join by beating. Literally, Wrought iron means an iron that can be worked, both in hot and cold forms.


One of the most creative forms of wrought iron manifests in trellis, grills, and other hollowed or pierced-out planner forms. Earlier trellis or grills were formed of wood, bamboos, vines, and cast of copper or bronze, or even of ceramics. These materials were not amenable to plastic shaping. Wrought iron has been used as a plastic material to form variety of trellis, in simple or multi-curved planner forms and also mould sub-elements differently.

The first lattices were functional elements like the protective cover within gaps, and in doors and windows. Simple linear cast or forged elements were inserted in side structures of masonry or wood. These, however, soon became interlacing or entwined entities of bars, hot-forged or riveted forming a grill. Same techniques were used for creating grills for hearths and sieves.


Wrought Iron lattices began to be used 13 and 14th C windows of mansions and cathedrals requiring high security. Same structures were used as barricades and partitions. The lattices were designed with variegated shaping of bars’ profiles, and in terms of angle and spacing. Hot-forging and cold working methods were used to alter the sections and shapes of the linear elements. Round and square rods and bars were twisted, coiled and beaten into complex foliated forms. Iron pieces were chiselled, chased, riveted, shape forged. Iron plates were also used for plate like tracery elements. Ends, finials and cresting were cast from other materials like brass or bronze and mounted over steel roods. Riveting and hot forging was chief techniques of joint making. Joints, However, were so skillfully concealed that the grill seemed like one cast or formed piece.

Wrought ironwork began to serve other decorative purposes. Famous cathedrals and other public buildings ( Canterbury and Winchester Cathedrals of England and Notre Dame de Paris) have extremely crafty pieces wrought iron works.

21793578980_aed850cf69_cWrought Iron lattice work, began as a rough surface entity, but by end of middle ages, the surfaces were well formed, ground and joints were concealed. Surfaces were often chased, engraved, inlayed with materials. Finials, caps and other elements of brass, copper, bronze and gold were added. Ornaments were forged out as separate parts, and assembled with riveting, or welding. Decorative elements, such as of flowers, leaves, vines, birds, names, and coats of arms, were bunched or heaped to provide a composition language.