Finding the required fastener count involves dividing peak design wind pressure by the design resistance of individual fixings. Learn how roof zonal layouts and safety margins ensure precise, cost-effective, and safe fixing patterns.
Flat roof fasteners must resist moisture and chemical exposure throughout their service life. Explore corrosion protection methods, including high-grade stainless steel and multi-layer organic coatings tested under Kesternich conditions.
Refurbishing or repairing flat roofs requires careful structural assessment. Discover industry guidance on conducting on-site fastener pull-out tests, evaluating existing deck conditions, and selecting overlay mechanical fixing systems.
Flat roof fastener design relies on rigorous standards including BS EN 1991-1-4 and European Assessment Documents (EADs). Discover how these regulations specify testing protocols, corrosion protection requirements, and safety factors.
A building's height, footprint, aspect ratio, and parapet walls heavily influence wind flow and suction forces. Explore how building geometry defines flat roof pressure zones and dictates the strategic placement of mechanical fasteners.
Geographic wind speed maps and terrain roughness, from open coastal land to dense urban centres dictate flat roof wind pressure. Learn how these factors dictate fastener numbers across corner, perimeter, and central roof zones.
Calculating wind loads involves applying Eurocode 1 (BS EN 1991-1-4) parameters. This guide explains how peak velocity pressure, pressure coefficients, and building geometry are calculated to determine exact wind uplift forces on flat roofs.
During wind uplift testing, roofing assemblies fail in predictable ways, such as membrane tearing over stress plates, fastener pull-out, or washer buckling. Learn how analysing these failure modes drives continuous product and system improvement.
Wind uplift test setups use sealed pressure chambers to simulate storm conditions on full-scale roof assemblies. Discover how differential air pressure, cyclic loading, and continuous monitoring measure the physical performance of fasteners and membranes.
Structural vulnerabilities in flat roof fixings often occur at perimeters, corners, and degraded deck substrates. This article explores critical weak points, including thermal bridging and cold bridging and provides strategies to eliminate them.
Wind uplift testing subjects full-scale flat roof mock-ups to dynamic cyclic pressures. Discover how standardised test protocols establish maximum load capacities, evaluate failure points, and grant European Technical Assessment (ETA) certifications.
Initial sizing determines the minimum fastener density required to safely secure a flat roof assembly. Learn how it balances structural safety with cost efficiency by calculating wind loads specific to roof zones, building height, and geography.
Reliable flat roof fastening depends on multiple resistance factors, including substrate pull-out values, stress plate bending stiffness, and membrane tear resistance. Learn how these factors are evaluated to ensure safe structural performance.
Accurately calculating flat roof fastener density is crucial for safety. This guide outlines initial sizing principles, factoring in design wind pressure, safety margins, and fastener characteristic pull-out loads to determine optimal fixing patterns.
Mechanical fastening provides fast, climate-independent installation for flat roofs. Discover its major advantages, including precise calculation of wind uplift resistance, easy dismantling for refurbishment, and immediate structural load capacity.
In seam fastening, mechanical fixings are installed along the overlapping edges of single-ply membranes before hot-air welding. Discover how this method simplifies installation while ensuring structural resistance against severe wind loads.
Rail fixing systems utilise continuous metal bars anchored to the deck to hold waterproofing membranes securely in place. Learn how field-fastening with bars minimises membrane penetrations while distributing severe wind forces evenly across the roof.
Mechanical fastening offers a reliable, all-weather solution for securing single-ply membranes and insulation. Examine system components, including stress plates, tube washers, and specialised screws, engineered to withstand heavy structural loads.
Bitumen bonding remains a classic method for anchoring multi-layer flat roofing systems. This overview explains torch-on, hot-poured, and cold-applied bitumen adhesives, focusing on bond strength, durability, and waterproofing integrity.
Polyurethane (PU) adhesive bonding provides a seamless, non-penetrative method for securing single-ply roofing membranes. Learn about application techniques, substrate compatibility, and the key benefits of avoiding thermal bridging in flat roofs.
Ballasted flat roofing relies on heavy materials such as rounded gravel, paving slabs, or vegetation to resist wind uplift. Explore the structural load requirements, installation techniques, and advantages of non-penetrative membrane attachment.
Flat roof fasteners must meet rigorous engineering standards for tensile strength, corrosion resistance, and load distribution. Learn how regulatory compliance and material selection guarantee long-term performance under extreme weather conditions.
Fastener failures can compromise flat roof integrity. This guide details primary failure mechanisms such as fastener pull-out, over-driven screws, membrane fatigue, and corrosion, highlighting preventative design and installation best practices.
Flat roofing systems face dynamic environmental stresses, from extreme wind uplift pressure to thermal expansion, snow loads, and UV exposure. Understanding these forces is essential for selecting appropriate mechanical fasteners and membrane fixings.
Flat roof construction requires a precise layered assembly including structural decks, vapour control layers, thermal insulation, and waterproofing membranes. Discover the key engineering principles ensuring weather tightness and long-term performance.
It is particularly important to ensure that the correct type of self-drilling screw is selected for wall applications
Self-drilling screws have the advantage that they can be processed particularly quickly, as there is no need to pre-drill.
The current part of the self-drilling screw guide is now devoted to avoiding damages that can occur due to improper assembly.
It is easier to determine the edge distances when using steel and aluminium components. DIN EN 1993-1-3: 2010 (Eurocode 3) regulates the edge distances for thin-walled steel components.
This part now deals with the edge distances to be observed when using self-drilling screws and thread-forming screws in timber, steel and aluminium parts.
In this part we would like to show you the basic procedures for screw manufacturing, take you on a journey into the production of EJOT and introduce you to the individual production phases using the example of the EJOT self-drilling screw JT3-18-5.5.
In this part we would like to show you the basic procedures for screw manufacturing, take you on a journey into the production of EJOT and introduce you to the individual production phases using the example of the EJOT self-drilling screw JT3-18-5.5.
In addition to functionality, optics also play a role in the screw heads. In the following, we will therefore take a closer look at the most common head styles and drives for self-drilling screws:
After we have looked at the two types of screws, we would like to conclude with a few special features of screws for industrial lightweight construction...
In order to achieve high load-bearing capacity values in timber, the screws have a coarse thread.
The screw connection as a mechanical fastening solution is still the classic method for connecting components to one another.
A rainscreen facade is made up of several layers. The wall brackets are attached to the first layer, the base material.
Get to grips with EJOT screw set anchors codes...
Understand the consequences if a fastening anchor point fails in both a single or multiple use application...
When it comes to the embedment of facade constructions, safety is of prime importance. The use of all EJOT embedment, connector and fastening elements is specified by construction law in an ETA (European Technical Assessment).
The EJOT plastic anchor, which is approved in Europe, is therefore always sold as a unit. To determine the necessary anchor length, it is important to know the thickness of the attachment to be fastened and the thickness of the non-load-bearing layer.
Facades are exposed to constant fluctuations in temperature. The materials used normally have different coefficients of expansion. It is therefore important to constructively allow for the possibility of thermal changes in length.
For each type of stone, a drilling process is specified by the approval. This is of vital importance to achieve the pull-out load capacity. In most perforated bricks and in aerated concrete, the drill holes must be created in a rotary drilling process.
A non-load-bearing system is a construction which does not contribute to the stability of the building. If the embedment fails, the fastened construction falls down, but the building remains intact.
Injection systems are used in particular for rainscreen facades, if another anchor no longer achieves the required loads. They allow maximum loads even with thin-walled perforated bricks.
A multi-shell exterior wall construction is referred to as a rainscreen facades. The non-load-bearing facade cladding is attached to the load-bearing wall level at a distance.
Based on the details of the total length and the details about the installation depth of the anchor in the substrate, the so-called grip length can be easily calculated...
CROSSFIX® by EJOT is a substructure system for the rainscreen facade. The console is made of stainless steel (A4).
In this article, 15 of the most common FAQs about all things Rainscreen & Façade have been answered by EJOT UK's experts.
Through bolts achieve their load-bearing capacity even in cracked concrete or in the case of seismic requirements through their aggressive expansion and the ability to expand afterwards.
Undercut anchors for concrete or injection systems for perforated bricks generate comparably high tensile capacity due to the guided joint connection with the substrate.
There are three different embedment mechanisms that form the basis for attaching a rainscreen facade: by frictional connection through expansion, guided connection through undercuts or adhesive bond through composite.
The necessity of an unrestrained fastening is not only specified by design guidelines, approvals and assembly guidelines, but is important for the later appearance of the façade.
This video gallery showcases interviews with EJOT UK’s technical and quality specialists, highlighting their expertise in materials science, product design, R&D, quality assurance, and installer best practices.
EJOT UK takes a holistic design approach beyond basic fastener supply, collaborating with OEMs and conducting application-specific testing past European Technical Assessment (ETA) baselines to guarantee compliance and real-world installation success.
EJOT UK maintains high product standards by combining ISO-certified quality assurance systems with rigorous quality control testing, including material hardness, coating thickness, and torque checks to drive continuous improvement and sustainability.
EJOT UK advances construction fastening through continuous R&D and rapid prototyping, while leveraging cross-sector innovations from industrial and automotive divisions to futureproof products for modern building requirements.
EJOT UK empowers roofing and façade installers with expert technical guidance, best-practice resources, and rigorous installation checking procedures to ensure high-standard, compliant fastener deployment on site.
EJOT UK utilises 3D CAD modelling, 3D printing, rapid prototyping, and advanced installation analysis to design, test, and refine tailored fastening solutions for evolving construction and industrial challenges.
EJOT UK leverages advanced materials science and laboratory testing at its Applitec Centre to analyse metal and plastic performance, ensuring fasteners exceed industry standards and deliver long-term structural reliability.
