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Overview | Ash | Hard Maple | Red Oak | White Oak | Tulipwood American Red Oak (Quercus Spp)Natural Durability To Wood-Destroying FungiEN 350-2 : 1994 The following classification provides an indication of the currently accepted characteristics and performance of wood in ground contact. Heartwood - class 4 slightly durable EN 942 : 1996 Based upon the above durability classification the natural durability is deemed insufficient for exterior applications. American red oak can, in practice, be used externally if the correct design, detailing and construction techniques have been adopted, along with an effective preservative pre-treatment. To maintain the protective coating “envelope”, an on-going maintenance programme is recommended. EN 335-2 : 1992 Cross reference to ascertain the relevant hazard class. Moisture MovementEN 942 : 1996 Classed as medium TreatabilityEN 350-2 : 1994 The following classification refers to a set of broad descriptions for classifying treatability based upon general observations associated with the use of penetrating treatment processes. Heartwood - class 2 Moderately easy to treat/class
3 Difficult to treat The required preservative pre-treatment, and optimum penetration and retention values, have been demonstrated with vapour phase treatments (ie Vapour Boron). GeneralA liberal coat of base stain (or primer) should be evenly applied to satisfy the timbers suction, by displacing the air in these cells. Consider the use of a “grain” filler beneath opaque coating systems. This timber contains a high level of water soluble, natural wood extractives (acidic). We would recommend thorough degreasing with a “sharp” solvent, so as to aid the adhesive performance of the base stain (or primer). To minimise the influence of extractives, a primer (or base stain) that is resistant to discolouration is recommended. In addition, the use of non-ferrous fixings is strongly advised; as is the avoidance of wire wool. This will minimise the appearance of “iron staining”.
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