Screws: the most effective joining technology for timber construction – Bouw Magazine

Because screws can withstand very high loads thanks to the screw thread and at the same time give connections the necessary flexibility, screws are the best connection technology for wooden construction.

Screwing is by far the most effective joining technique in timber construction; especially if the connections are subjected to high forces. Screws not only provide a firm connection, but they are also (fire) safer and quicker to process. In connections that previously required dozens of nails, today only a few screws are sufficient. The range of wood screws has now been expanded to such an extent that there are screws for all work in wood construction. Not only for wood-on-wood, but also for wood-concrete and steel-wood connections.

Because screws can withstand very high loads thanks to the screw thread and at the same time give connections the necessary flexibility, screws are the best connection technology for wooden construction. Nails are certainly cheaper, but for a solid connection you can make do with significantly fewer screws. The installation time of modern screws has also been greatly reduced due to the design of the screw tip and thread, the use of coatings, the advent of the torx drive and powerful battery powered screwdrivers. Screws also have a cosmetic benefit when completing construction projects. Thanks to materials such as stainless steel and different types of heads that sink into the wood without cracks or chips, the result is a beautifully finished surface.

The new HECO-Topix-plus is available for many applications.

“Screws are very functional,” says Fabian Mohr, wood screw specialist at HECO-Schrauben. “The disadvantage of nails, staples and staples is that they only absorb loads in one direction and that they are sensitive to vibrations and shocks which can cause them to loosen. In combination with a nail or staple gun, they are effective for processing sheet material. Adhesives are particularly suitable for the pre-fabrication of wooden parts in production halls, where temperature and humidity can be controlled. Finally, you can use wooden dowels, but they are less robust and very labor-intensive because of the pre-drilling.”

Special wood screws
HECO-Schrauben is one of the largest screw manufacturers in Europe. Already in 2000, the German family company introduced one of the first special wood screws on the market, HECO-Topix. Over the years, an extensive range has been developed with around 2,000 different types of wood screws, which are used in furniture and interior design, facade construction, wooden construction and for the assembly of chipboards, MDF, glass strips, terrace boards, insulation material and solar panels. There is a screw for every type of wood and application.

HECO-TOPIX-plus
In 2020, HECO-Schrauben introduced the new HECO-TOPIX-plus. This new screw combines all the innovations that HECO has developed for its wood screws over the years. For example, the screws all have the special TOPIX plus point, which facilitates screwing in and at the same time prevents the wood from splitting. They also have a unique, variable screw thread, which means that two wooden parts are automatically drawn towards each other. The thread is optimized for all screw lengths and HECO has developed a new HD drive that even holds stainless steel screws on the drill. The HD drive is interchangeable with standard Torx.

HECO-WS (wood and steel) and Multi-Monti TC (TimberConnect) for wood-steel and concrete-wood connections.

Responsibility
All HECO-TOPIX-plus variants naturally have an ETA-19/0553 approval. The admission report consists of more than a hundred pages, where the various applications are extensively documented.

Mohr advises architects and calculators to always look critically at specifications of screws in tenders and specifications, because screws are critical construction elements. The different brands and types cannot simply be exchanged. It is necessary to have the application of other screws checked before the start of the project. There are costs involved, but if the use of unspecified screws leads to errors or even accidents, the contractor is liable.

oversizing
“Often extra nails or screws are used in construction projects out of habit or just to be on the safe side,” Mohr concludes. “However, the quality of screws has improved enormously, the approvals are very precise, and there is good calculation software such as our HCS, with which wooden structures and their loads can be calculated correctly. If the specifications and specifications are met, the quality of the construction is guaranteed and the contractor can save material and labor time.”

For more information on all HECO screws: see www.heco-schrauben.nl or contact us with the importer Jac. Lowie & Zoon BV, telephone 035-541 5958 or by e-mail: office@lowie.nl

A more comprehensive article on the use of wood screws can be found at: www.heco-schrauben.nl/houtschroef

The HCS calculation software for wood screws from HECO.

HECO-Schrauben supplies a complete range of wood screws under the name HECO-TOPIX-plus. The range includes stainless steel, blue and yellow galvanized screws with PZ, HD or T drives and different types of screw heads for mounting heavy wooden constructions; floors and terraces; solar panels; glass beads; back walls or sheet material. In addition, HECO supplies a number of special screws such as threaded rods (HECO-WB) with a length of up to 3 meters, steel dowels (HECO-WS) for steel-wood connections and a combined screw anchor/wood screw (Multi). -Monti TC) for mounting wood, concrete. HECO-WS can be fixed in wood and through steel plate in a single step without pre-drilling. The screw can be screwed through 3 steel plates with a thickness of 5 mm each or through 1 steel plate with a thickness of up to 10 mm. Multi-Monti TC is a combination of a screw anchor with a wood screw and can be used for mounting wood on concrete in accordance with Eurocode 5. The screw anchor is screwed into the concrete in through-mounting and galvanized into the wood.

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