Description

KHA perforated sheet metal with 15 mm round holes in a staggered pattern, also known as standard R15 T20 grating, is an ideal option for balcony railing infill, thanks to its balance between transparency and safety. The regular pattern with 15 mm diameter holes spaced 20 mm center-to-center provides an effective combination of light transmission and protection, while maintaining the mechanical strength required for railing applications. This R15T20 perforated sheet has a transparency of over 50%, allowing light to pass through the balcony railing, creating an airy and bright space, while limiting the risk of accidental falls. The staggered arrangement of the perforations provides increased stability, making this sheet metal a robust and reliable choice for low-cost construction projects. The R15 T20 perforation remains economical. From an aesthetic point of view, the R15T20 perforated sheet metal offers geometric simplicity, and its visual repetition makes it a discreet yet elegant option for large public housing towers, suitable for contemporary or industrial environments. The distribution of circular holes creates a balanced visual effect, while the staggered arrangement adds a subtle dynamic depending on the viewing angle and natural lighting, in line with the budget for renovating social housing. R15T20 perforated metal filters light while protecting against objects falling from balconies. Its simplicity of manufacture makes it an economical solution for large-scale projects, such as thermal renovations of apartment buildings or blocks of flats. R15T20 perforated sheet metal is a simple, functional, and economical choice for balcony railings.

Uses

The use of KHA R15T20 perforated sheet metal for balcony railings in public housing buildings and towers is an excellent choice for staying within budget while ensuring safety and a modern aesthetic. Perforated sheet metal is known for its low price! Thanks to its simple manufacturing process, the R15T20 pattern is mass-produced, which reduces costs while ensuring inexpensive production. Compared to other more complex decorative patterns or more expensive materials such as glass or wood, R15 T20 perforated sheet metal is affordable and versatile. Made of galvanized steel, KHA R15T20 perforated sheet metal offers high resistance to weathering, UV rays, and corrosion, making the product economical in the long term as it requires little maintenance. Although the perforated metal has 15 mm holes, the metal mesh seen from a distance provides sufficient privacy by reducing visibility while maintaining an opening to the outside. This is particularly suitable for balconies in low-income housing in densely populated urban environments. The simple, repetitive geometric pattern of KHA sheet metal is perfectly suited to the facades of public housing buildings from the 1960s and 1970s, giving them a contemporary style while remaining understated and functional. The choice of powder-coated colors (gray, anthracite, black) can accentuate the modern look of the building and blend in with urban tones. As the R15T20 perforation is an industry standard, it offers economies of scale, particularly when ordered in large quantities for public housing blocks and towers.

Effect produced

The R15T20 perforated sheet metal used to fill the balconies of social housing offers several interesting visual effects, linked to transparency and the perception of the perforations depending on the distance of the observer. With a transparency ratio of around 55%, the staggered perforated sheet metal allows a significant amount of light to pass through, illuminating balconies that receive little sunlight. This arrangement of solid material and open spaces creates a bright space, ideal for balconies in urban areas where natural light is precious. Depending on whether the balcony faces east or west, the light passing through the perforations can cast round shadows on the floor or walls, creating subtle light effects. The R15T20 sheet metal is relatively open, with 15 mm holes and a staggered arrangement that barely contributes to maintaining relative privacy for balcony occupants. From the outside, observers will have a blurred view of the interior, which reduces the risk of being seen while preserving the view to the outside for those on the balcony. This effect is accentuated by the regularity of the pattern, which, from a distance, appears more homogeneous, making it difficult to see details through the grid, especially if the standard perforation is painted in a light color. From the balcony, the 15 mm holes are clearly visible, and the regularity of the R15T20 grille becomes a dominant graphic element. The staggered circular pattern creates a clean, modern geometric effect. This gives the railing an industrial and orderly aesthetic. From the street, the grille becomes more diffuse. The round holes blend into the overall view, giving a more filtered appearance. This is particularly useful for public housing balconies, where it is important to partially conceal the interior without sacrificing light or budget. From a distance, the sheet metal gives an impression of visual continuity while adding a touch of modernity to the façade.

Team advice

To ensure the mechanical integrity of the abstract moucharabieh applied to the R15T20 guardrail infill panel, our Design Office recommends optimizing the laser-cut galvanized steel sheet with a thickness of 20/10ths to comply with the NF P 01-013 guardrail safety standard. The destructive bag test was carried out on a dynamic load using a soft body with a diameter of 50 cm and an impact of 600 joules, applied to the geometric center of the mashrabiya panel on the balustrade.

Balcony opacity

Visual opacity is achieved by using light-colored paint, which reduces oblique glances.