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Wood in Landscaping

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  aravinda devaraj(1rv05at004) preetha a meda (1rvo5at046) WOOD IN LANDSCAPE [ 8 th   sem, b.arch ‘a’  06-03-2009 ] [ LANDSCAPE ARCHITECTURE ]  TREATMENT FOR WOOD USED OUTDOORS..  Why does wood need to be treated? Wood will decay if temperature, oxygen, and moisture are not controlled. The simplest way to prevent biological deterioration is to keep wood dry. However, this is not practical for outdoor structures. Where temperature, oxygen, and moisture cannot be entirely controlled, use of decay-resistant wood species and/or woods treated with preservatives is the only option to prevent wood deterioration. What form of deterioration can take place? ã Decrease of strength due to faults. ã Absorption of water, thereby causing warping. ã Raised grain ã Shelling So how is treatment done? Wood is treated with copper and arsenic forced into the grain inside high-pressure cylinders. Because the chemicals are fixed in the wood and don't leach out, pressure-treated wood is safe to use in vegetable gardens. ã Wood preservative contains chemicals that kill the fungi and insects that discolor or destroy wood. ã A water repellent is a penetrating wood finish loaded with oils or waxes designed to prevent water from soaking into wood. After wood is properly treated with any waterborne-preservative-treatment process, it is re-dried (kiln dried or air dried).  What other treatment does wood generally undergo? Wood can also be given the following treatments, although they are more for aesthetics than preservation.  Painting: Two coats of paint are applied over one coat of primer to completely obscure the wood grain.   Bleaching: A uniform weathered effect can be achieved  Staining:  finishing that retains the “natural” look of the wood.   ã Transparent stains contain no pigments but have water-repellent features that protect the wood without hiding the natural coloration, and slow the natural color change process. ã Semi-transparent stains , because of the added pigment, are less natural , but equally beautiful. They modify the srcinal wood color and to a lesser degree the characteristics of the wood, such as grain and knots-but not enough to take away from the overall impact of the wood's natural qualities. ã Opaque stains are high in pigment content and thoroughly hide the grain and color of the wood. Old Wood: Serious moisture problems cause severe blistering and peeling. Exhaust fans, attic louvers or fans, vented holes or wedge vents and caulking may be necessary before repainting. Power sanding down to the bare wood, then priming and painting may be necessary. Chalking can be removed by washing. Mildew can be treated with a good wash-down, using household detergent then mixing bleach with water and letting it sit on the affected area for a few minutes before rinsing off.  Any alternatives? Use of lumber with natural decay resistance such as redwood, cedars, and bald cypress.
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