Self-Drilling Roofing Screw

The quality of self-drilling roofing screws affects the integrity and service life of roof coverings. The drill bit at the tip of the fastener eliminates the need to pre-drill holes, which simplifies roofing work and reduces installation time. Despite its name, the roofing screw has a wider range of applications: it is used for cladding exterior building walls and pavilions with sandwich panels and profiled metal sheeting, as well as in fence construction.

Design of the self-drilling roofing screw

The fastener consists of several elements forming a single whole. The core of the product is a strong shank with full fine-pitch thread and low-profile threads. The lower end of the shank is fitted with a special drill bit, which allows the screw to work on its own: there is no need to pre-drill pilot holes or ensure that the diameter of the prepared holes matches the fastener’s dimensions.

The upper part of the working shank has a hexagon head fitted with a metal washer and an EPDM gasket. This head design ensures smooth, tight clamping of the fastener against the roof covering and seals the joint. The EPDM backing is made of elastic, weather-resistant rubber with a long service life.

Materials

Self-drilling roofing screws are made mainly from high-strength, high-carbon steel alloys. These fasteners are electrogalvanized to protect the metal from atmospheric exposure. Roofing screws made of austenitic chromium-nickel steel are also popular; without additional coating, they are resistant to moisture and corrosion.

Additional protection and appearance are provided by a paint coating on the heads and metal surface of the washers, applied in colors according to the international RAL system. The decorative layer is applied with powder coatings that adhere well to metal. The color of the screw heads matches the color schemes of roofing materials, so the fastener can be selected to match the roof shade or to create a contrasting look.

How to calculate the required quantity of self-drilling roofing screws

To avoid errors in the quantity of fasteners, you need to determine the roof covering area and prepare a material layout plan. The average fastener consumption per square meter for various materials is usually indicated on the packaging or in the accompanying documentation.

Practical experience shows that fastening 1 m² of metal tile roofing requires 8–10 screws, while profiled sheeting requires about 18 pieces. This quantity should be multiplied by the roof area, with an additional 10% added for contingencies. This way you can independently determine the required quantity of self-drilling roofing screws for a specific project.

Installation features

A roof covering lasts a long time and performs reliably when its installation strictly follows the technology. Not only the order of laying the sheet material matters, but also its fastening. When drilling and tightening a roofing screw, you must work strictly along the axis of the fastener: the slightest deviation from vertical can enlarge the working hole and compromise the tightness of the joint.

The recommended tightening torque should also be observed, to avoid deforming the rubber gasket and the roof covering if it is exceeded. A reduction in torque can lead to gaps, and gaps can lead to leaks.

FLOK specialists will help select fasteners and calculate the required quantity. FLOK supplies fasteners in small and large wholesale batches with delivery to any address in Russia.

L (mm)	d
	4.8 ZN	4.8 Maalattu Painted
28
35