Eurotec catalogue fastening technology Strana 17
Nabídka komerčních zákazníků **Nejlépe prodávané z Eurotec
Terrassen und gartenbau Deck construction and landscaping our expe especi rtise ally fo r you © NATURinFORM Expert hints Hazards in the construction of timber decks The various timber types differ from one another not only in their appearance but also in their technical properties: • One particularly important property of wood with regard to deck construction is dimensional stability (also known as “resilience”). Experts use this term to refer to the property whereby wood changes shape in the course of use due to swelling or shrinkage. The various timber types show different degrees of dimensional stability. For this reason, special attention must be paid to the choice of the timber type. For deck construction, we recommend using timber with high dimensional stability. Some timber types, including massaranduba, exhibit lower-than-average dimensional stability, so we explicitly advise against using these timber types for deck construction. Since, from an absolute perspective, the swelling and shrinkage behaviour increases as the width of the timber boards increases, we also recommend a maximum board width of 120 mm. You can find details of the dimensional stability of some common timber types in the “overview of timber types” on p. 20 - 26 of our catalogue. • Rift-sawn planks should always be used in preference to flat-sawn planks, as they have considerably better properties with respect to cracking, splintering, swelling and shrinkage, as well as dimensional stability, and therefore tend to distort and warp less. often, so-called flat-sawn planks cannot be fastened permanently with either visible or hidden methods. In such cases, we cannot guarantee permanent fastening. • Even fine particles of abraded metal can lead to dark spots of corrosion on the timber boards. metalwork should not therefore be carried out in the direct proximity of the deck. • Constituent substances in the timber can cause contamination of adjacent surfaces; it is therefore important to take constructive precautions, such as maintaining sufficient distances from nearby components. • As nature does not adhere to quality guidelines, the suitability of timber for deck construction does not depend solely on the timber type. often, problems can occur even due to individual batches of a timber type that is normally harmless. Possible reasons for this include spiral grain and insufficient drying. ➔ Spiral grain refers to a wood grain that has grown in a spiral around the trunk axis; this becomes a problem if, in the course of use, the moisture contained in the wood deviates from the moisture level at installation. If this happens, internal tension in the wood is released and can therefore cause the deck boards to warp. The energy released in this process is so enormous that it often impairs even perfectly installed fastening systems. ➔ It is a property of every timber to be able to absorb and emit water. For the user, this property can primarily be perceived through the timber’s swelling and shrinking. one task of the timber trade is to bring timber to the correct state of dryness for the respective area of use. If timber is used that has an incorrect moisture content at installation, this can quickly lead to damage. • Many properties of the timber vary strongly depending on the grade. It is therefore advisable to contractually stipulate all criteria in advance with your timber dealer! • Particular care should be taken when purchasing Bangkirai. In the past, increased demand often meant that substitute timber from South East asia was – knowingly or unknowingly – traded as Bangkirai. most of these substitute timbers are considerably less suitable for deck construction. This results in cracking, strong warping and bending of the boards. • It is essential to use identical timber types in order to ensure the durability of the deck – i.e. the upper deck and substructure must be made of the same material. • Application of bits made of stainless steel When setting screws, it inevitably always leads to a little abrasion between the screw drive and bit. This abrasion can lead to discolouration of the wood surface and the screw head in outdoor applications or in wet rooms, when attaching wood rich in tannins. mistakenly, this is often attributed to the screw, even if it is made of stainless steel. In order to avoid the risk of discolouration due to extraneous rust, stainless steel bits should also be used for setting stainless steel screws! A lot of damage to deck structures can be prevented in advance by thoroughly inspecting the timber that is to be installed. If, for example, the tradesman responsible already notices deformation in the deck boards before installation, none of these boards should be installed. 17
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