Wooden terraces are weathered variations of temperature and humidity, as well as a direct effect of the weather; additionally, the tannic acid in the wood attacks the screw steel. Therefore, fischer terrace screws are made of austenitic, stainless steel: This ensures a lasting safety of your terrace fixing.
The smaller the pH-value, the higher the acid content in the wood. If a screw resists this tannins, depends only on the steel grade.
The fischer terrace screws Power-Fast are perfectly suitable for lasting fixings in high-quality timber for terraces.
The enlarged diameter of 5,5 mm offers a significant higher resistance against turning and the stress during swelling and shrinking of the wood. The rarely visible countersunk head ensures a aesthetic attractive terrace surface.
Due to its fixing thread, the screw connects the board safe with the sub-structure and prevents the stepping out of the head during shrinking of the wood. At the same time, the stull covering will be fixed and wood noises under extreme stress will be avoided. The Power-Fast thread allows a screwing in the border area, without splitting the wood. Furthermore, the screw thread with the unique Power-Fast geometry ensures a good bite.