Kingi’s blog

The durable KINGI® roofing screw reduces the need to replace sheet metal roofs and the waste generated. The powder-coated finish is manufactured without solvents that are toxic to the environment.

Did you know that the coating on a roofing screw may be merely decorative and unable to withstand Finnish weather conditions for decades? Read how to identify the right fastener and avoid an expensive roof renovation prematurely.

The most important task of a roof is to protect the building from the weather, and sheet metal roofing is in a class of its own in this respect. A properly coated and fastened sheet metal roof lasts for over 50 years, but its actual service life is often determined by a small component: the fastener. In this article, we explain why the roofing and roofing screw must last just as long.

Check the condition of your sheet metal roof once a year. These 6 points tell you whether your roof is in good condition and when the screws should be replaced. Perform the inspection yourself.

A metal roof lasts for decades when you maintain it properly. Here is how to clean debris from the roof and keep the roofing and fasteners in good condition for a long time.

No one wants a car with rusty and scratched body panels, yet the roof is often treated in exactly this way. The roof is one of the most expensive surfaces of a house, however, and it deserves the same care as a car. In this article, we compare roof and car care and explain why durable fastening extends the roof’s lifespan.

With modern coatings, a metal roof achieves excellent corrosion resistance and a long service life. A high-quality metal roof is easy to maintain, and its strength and watertightness remain intact for decades when it is fastened correctly. We have compiled seven reasons why a metal roof is a sensible choice.

A well-designed and properly installed metal roof can last up to 25 years without maintenance. A long maintenance interval does not happen by chance, but is the result of four crucial choices already during the construction or renovation stage. Read which four actions ensure your roof a long and trouble-free service life.

The fastening method for sheet metal roofing has slowly evolved from nails to screws, and this development has been necessary. The old nail fastenings from the 1960s and 1970s caused plenty of leakage problems and extra work for roof owners. In this article, we review the history of fastening methods and explain why the right roofing screw is crucial for the durability of the roof.

CEO Kimmo Riihimäki has spent over 22 years on Finnish roofs and has seen more than 10,000 roof renovations during that time. Years of experience revealed the same problem again and again: the roofing sheets held up, but the screws failed. This gave rise to the idea of developing a roofing screw that lasts as long as the roof itself.

Tuusulan Peltikeskus added the KINGI® roofing screw to its selection only after unit manager Sami Eemola had tested the screw himself. With extensive experience in roof installation, Eemola wanted to make sure that the promises were not merely sales talk. Read why he was convinced and how a selection consisting of one screw also makes inventory management easier.

– We trust Weckman and, of course, want to be worthy of that trust. We believe that KINGI® fits excellently into our high-quality product families. The main reason for adding the KINGI® roofing screw as an alternative to our product range is the interest in the KINGI® roofing screw that has come from professional builders. We listen closely to our customers and respond quickly to their needs, says Timo Nurminen, Regional Sales Manager at Weckman. Timo is a long-standing Weckman employee. This summer marks 30 years. – In this job, you are somewhat in a vantage point. It is interesting to see how the construction industry operates, how the mechanisms of trade work, and how methods and products in the construction sector develop. The owners have always given us an appropriate amount of responsibility, and the work is interesting because there is a lot of freedom to do things in your own way and the job description is broad, Timo praises. Weckman Steel Oy, more familiarly Weckman, is the largest Finnish-owned company manufacturing roofing sheets and products. The group also includes Levypyörä Oy in Nastola and Esco AS in Estonia. The group’s turnover is approximately 46 million euros and it employs around 300 people. In addition, Weckman is a shareholder in Orima Oy in Orimattila, which manufactures roof safety products and rainwater systems, as well as in JHW-Profiles GMBH, which manufactures profile sheets in Germany. – Weckman is a traditional family business where steel and iron have been forged for 8 generations. The company’s main location is in Vierumäki, where the headquarters and 30,000 square metres of factory space are located. The company has operated as a limited company since 1962, serving professional customers in trade and construction and, together with them, the entire consumer sector. Weckman has Finland’s widest range of steel roofing products, around 250 alternatives. For example, there are five alternatives of tile-patterned profiles, some available in two different steel thicknesses. Two-thirds of the turnover comes from roofing sheets and the rest from tractor trailers and steel-framed sheet-metal halls. The leading export markets are the Nordic countries, the Baltic countries and Russia, Timo says. The KINGI® roofing screw is initially sold on the Finnish market, but there has already been talk of exports to the German market as well. – KINGI® could be a worthwhile alternative for the German quality mentality, Timo envisions. Quality and durability are therefore very important to Weckman. Although products are made for different price categories, the company nevertheless wants to make quality products in all categories. While many companies consciously set out to weaken quality in order to make the price as low as possible, Weckman has not taken that path. And will not. – We see that quality speaks specifically to the developer, or the end consumer. Questions related to quality and durability are easily left to trouble the mind, and consumers do not want to be uncertain about the durability of the products they have chosen. Here in Finland, the temperature variation on a roof surface can be more than one hundred degrees over the course of a year, so building materials are subjected to severe stress simply because of the temperatures, Timo says. In addition to temperature variation, building products are worn by air pollution, rain and moisture, as well as solar radiation. – In life-cycle thinking, all components of the whole must be of consistently high quality. A harsh climate requires durable building products, of which KINGI® is a good example, Timo says about building products suitable for climatic stress. Although the suitability of building products for the climate at the construction site is important, according to Timo, professionals are most interested in the usability of the building product: – Among professionals, Kingi’s installability is an important selling point. It is the number one thing when you can promise the installer and entrepreneur that with the KINGI® roofing screw, which drills in faster than a standard screw, you save time and money.

“ KINGI® doesn’t slip,” state the installers at Hämeen Laaturemontti unanimously. Read what the professionals say about the KINGI® roofing screw’s drilling ability, higher crown head and tighter thread based on their experiences on worksites.

Kymen Kattokeskus's installation team tested the KINGI® roofing screw during a roof renovation. The best feature was its drilling capability: the screw requires no force and does not scratch the sheet metal.

Both sound unpleasant and cause economic damage. We explain the four basic elements of corrosion and how zinc sacrifices itself for steel.

Corrosion cannot be completely prevented, only slowed down. We will go through how paint and sacrificial zinc protect steel and why two thin coats of paint outperform one thick coat.

KINGI® roof screw superiority can be summed up in one word: worry-free. The design-protected crown base does not collect water, and the price difference compared with rusting screws is less than one percent of the entire roof.

Reddish-brown rust marks can appear on a new sheet metal roof just a few weeks after installation. In most cases, the cause is not defective sheet metal, but scratches and metal particles created during installation that initiate corrosion. Read how the damage occurs and how it can be avoided with the right roofing screw and careful installation.

Roofing screws should last as long as the roofing sheet. The patented three-layer coating and the water-shedding head design make KINGI® a truly durable roofing screw.

Single-layer-painted roofing screws rust and force you into expensive repairs. An additional investment of only about 100 euros in KINGI® roofing screws brings 20 years of peace of mind.

The CE marking became mandatory for construction products in 2013, but it does not tell the whole truth about the durability of roofing screws. The CE marking of many manufacturers is based on a standard that does not recognise painted screws at all, meaning that they are classified as suitable only for dry indoor air. In this article, we explain why the CE marking alone can mislead the buyer.

With KINGI® roofing screws, over 10,000 roof renovations compliant with regulations have already been carried out. Building regulations require roofing screws to have the same corrosion resistance as roofing sheets.

Two construction engineers chose the KINGI® roofing screw for their own roof. Easy installation, good holding strength and no scratches on the sheet metal surface.

The European standard requires that the roofing screw match the roofing sheet in terms of corrosion resistance. Paint comes off a poorly coated screw already during installation, and rust starts immediately

Is your current or future roof made of Finland’s most popular roofing material, namely paint-coated steel? By the start of the 21st century, the corrosion resistance of painted roofing sheets had increased to over 50 years and the maintenance interval to over 20 years, thanks to the Pural® coating developed in Finland. This development work was necessary to ensure that roofing sheets meeting Finnish requirements were available for use on Finnish roofs. All painted roofing sheets are made of triple-coated carbon steel and are sold under many different brand names. When discussing the durability of a metal roof, the roofing screw is, unfortunately, all too often overlooked, even though it plays a vital role in the longevity of the entire roof and in maintaining the validity of warranties. This oversight is understandable, as buyers of a durable roof take it for granted that the roof will also be installed using equally durable roofing screws. This is not always the case, even though Finnish building regulations require it; roofing sheets must be fastened with roofing screws that have equivalent corrosion resistance (installation standard SFS EN 1090-2). Since 2015, when the triple-coated KINGI® roofing screw was launched, a matching fastening solution has been available for steel roofs. Why do single-layer coated screws rust? There are no shortcuts when it comes to rust protection for steel products installed on roofs. Electro-galvanising and a single thin coat of paint without pre-treatment do not provide sufficient protection for steel products intended for outdoor use. With this type of coating, roofing screws will not withstand installation and will rust away on the roof long before the roofing sheet itself. Unfortunately, these roofing screws are sold for outdoor use without justification. The only completely reliable indicator of a roofing screw’s suitability is the crown head. Only this guarantees that the screw has a triple-layer coating. The three-layer coating guarantees rust resistance The three-layer coating process used for KINGI® roofing screws is patented and was developed by Jorma Kinnunen, M.Sc. (Eng.), who has carried out pioneering development work to enhance the corrosion resistance of steel roofs. Screws intended for outdoor use must have an adhesion layer (pre-treatment), a primer and a topcoat on top of the zinc layer. This is the case only with KINGI® roofing screws. Sharper corners on steel structures require a thinner coat of paint than flat surfaces. According to painting standards, sharp corners and edges must be rounded off, which is why this has been done for KINGI® roofing screws. This ensures there is sufficient coating at every point. The adhesion of the coating is guaranteed by a special silane bonding layer, whose chemical bonds anchor the primer to the substrate. The two layers of powder coating total 120 micrometres, which provides sufficient protection even against C4 climate exposure. When you’re ordering a new steel roof or having an old one repaired, it’s worth remembering that the cheapest part of the package is the roofing screw. A roofing screw can either ruin your roof or ensure it lasts for years to come. Only accept a three-layer coating. You can only obtain KINGI® roofing screws with a three-layer coating for your roof from our authorised dealers.

In the corrosion test conducted by HAMK’s Sheet Metal Centre, the KINGI® roofing screw stood out from its competitors with its superior durability. Under demanding conditions simulating urban and industrial climates, only KINGI® remained completely rust-free throughout the entire 1,000-hour test period, demonstrating that it meets the service life requirements of roofing sheets.