Eurotec catalogue fastening technology Page 18
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Deck construction and landscaping Selecting screw steels based on their corrosion resistance Step by step Select the right screw material for your project by observing the following principles. go through the three points one after the other. The right material is marked for points 1 and 2 with (X) at least, or even better with X. In the event of additional chemical stress, point 3 must conform as well. 1. What‘s the component‘s situation? Is it exposed to the weather (fence) or is it protected (ceiling beam)? 2. Which wood is being fastened? Is it simple construction wood, or tannin-rich tropical wood? 3. are there any additional stresses in situ that encourage corrosion? Location near the sea? Heavy industry, etc.? Example: fastening a façade made of Douglas fir 1. Use class = 3, because exposed to weather. Façade = optical requirements. ➞ at least C1 2. Douglas fir ➞ min. C1, but an a2 or a4 is to be preferred. 3. This point is not required, because there are no further external stresses. Selection: C1 is possible, but a2 or a4 is to be preferred. Carbon steel Steel group Product examples Electroplated Special coating Stainless steel, martensite C1; hardened stainless steel Paneltwistec blue/yellow Hobotec blue/yellow Paneltwistec 1000 Topduo Terrassotec stainless steel, hardened Hapatec Stainless steel, austenite A2 A4 Terrassotec A2 Terrassotec A4 Hapatec Heli X X X X X X X X X 1. Position of the component? Service Class (NKL) 1 a) Service Class (NKL) 2 a) Service Class (NKL) 3 a) X X - X X (X) b) 2. Which wood? c) Structural timber, wood materials Beech (red beech) Douglas fir Spruce Pine Larch Coniferous wood, pressure-impregnated Red cedar Fir Thermotreated wood from coniferous wood X X X X (X) b) X - X X X X (X) b) X - X X (X) e) X X (X) e) (X) b) X - X X X X X X (X) b) (X) f) X (X) f) X X X X X X X X X X Abachi Afzelia, doussié Azobé, bongossi Bangkirai, balau Bilinga Courbaril, jatobá Cumarú Sweet chestnut Oak Eukalyptus Garapa Ipé Iroko Itaúba Kosipo Massaranduba Merbau Robinie Thermally modified timber made from hardwood - - (X) e) (X) e) (X) e) - (X) f) (X) f) X (X) f) (X) f) X X (X) f) X X X X X X X X X X X X X X X X X X X Constant condensation g) Salt load h) Aggressive atmospheres k) Chlorous atmospheres l) - - (X) b) (X) b) - X X (X) m) - d) 3. Additional chemical load? a) b) c) d) e) f) 18 - Use classes in accordance with DIN EN 1995:2008. NKL 1 - components in structures enclosed on all sides, partly heated. NKL 2 - components in roofed, open structures without direct weather exposure. NKL 3 - freely weathered constructions. Recommended only for less significant fastening points, or for temporary objects, or if there are no visual requirements. Pilot-drilling and, where applicable, pre-countersinking, is recommended in general for hardwoods. This also applies for coniferous woods in deck and façade construction. Untreated: spruce, fir, pine, composite timber, KVH®, veneering laminated wood, solid wood, etc., plywood, OSB, fibreboards, cement-bound and gypsum fibreboards, etc. In our experience, using this timber with C1 does not lead to problems with corrosion or timber discolouration. Depending on the origin of the timber, however, this cannot be ruled out completely. Please also inquire at your timber dealer. Use of A4 is recommended. Please contact your wood dealer as well. g) h) k) Uninterrupted condensation in a water vapour atmosphere with only slight impurities. Building components close to roads heavily affected by salting in winter, coastal areas, in offshore and other industrial installations. For example: building components in road tunnels, pig stalls or in other aggressive atmospheres, possibly with additional higher air humidity. l) Building components in indoor swimming pools or other chlorous atmospheres. m) Use to be checked in the individual case. This overview cannot take account of all applications. Materials can be assigned to more unfavourable conditions as well in an individual case.
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