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Overview | Ash | Hard Maple | Red Oak | White Oak | Tulipwood American Ash (Fraxinus spp.)EN 350-2 : 1994 American ash has not yet been appraised for inclusion. Therefore the following classifications for durability and treatability are based upon practical experience. Natural Durability To Wood-Destroying FungiHeartwood - class 5 not durable The above classification provides an indication of the currently accepted characteristics and performance of wood in ground contact. EN 942 : 1996 Based upon the above durability classification the natural durability is deemed insufficient for exterior applications. American ash 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 small. TreatabilityHeartwood - class 2 Moderately easy to treat The above classification refers to a set of broad descriptions for classifying treatability based upon general observations associated with the use of penetrating treatment processes. GeneralA liberal coat of base stain (or primer) should be brush applied liberally and evenly so as to satisfy the timbers suction, by displacing the air in these cells. This principle can be applied to a factory situation, particularly when the first coat of base stain (or primer) should be dipped for a minimum 30 seconds of “contact time”. Consider the use of a “grain” filler beneath opaque coating systems.
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