If you're planning on building a wooden fence or outside structure, be sure to consider the deteriorating forces that high temperatures and moisture have on wood in Louisiana.

Especially in our warm and humid state, it is important to choose an appropriate wood when building a fence or outside structure. After selecting the wood, a maintenance program consisting of staining or periodic retreatment will give the most satisfactory results.

The principal causes for wood failure in Louisiana are termites and decay rot caused by the state's moist, warm climate. When conditions are favorable for their growth, microscopic filaments of decay fungi grow through wood, breaking it down and using it for food. Fungi and termites both need warmth, moisture and oxygen to grow. Keeping as much wood off the ground as possible will reduce retained wood moisture.

Termites and decay around a structure are a problem where excessive water is either absorbed or trapped in cracks and joints. Because they are in the ground, posts must be pre-treated to resist insects and diseases.

Water that enters the surface checks of horizontal rails and boards keeps internal wood wet enough to decay unless the wood is treated to resist such deteriorating forces. Retained water is even more destructive in shady locations.

Water is absorbed through the ends of wood faster than through the sides. The problem is more accelerated at the ends of rails, braces and boards. A water-repellent preservative can help reduce the problem.

Woods most commonly used for decks and fences in Louisiana are western cedar, redwood, cypress and pressure-treated southern pine.

Chemical treatments and water repellents increase the useful longevity of wood used outdoors. Chemical treatment can be done by dipping, brushing or by pressure. Pressure treatments that force preservative chemicals into weed are better because they provide in-depth protection against both decay and termites for a long time. Generally, Southern pine is the only type of pressure-treated wood available from local retail outlets.

Posts should be pressure-treated unless they are decay-resistant heartwood. Above ground parts of decay-resistant wood may last satisfactorily from 10 to 15 years.

Pressure-treated pine will last much longer. Quality of treatment is not always indicated by the color of the wood. That's because wood fades to a more neutral color after exposure to sun and rain. Penetrating water-repellent stains also may be applied to fence posts to alter the initial color and to reduce warping, checking and cracking.

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RV Investigator, the new $126 million CSIRO research ship, arrived in Hobart on Tuesday. Photo supplied.

It's 10 decks high, cost $126 million and catapults Australia into the marine science big league, but there was no one from the federal government on the dock in Hobart to greet CSIRO's new flagship when it arrived on Tuesday.

First mooted under the Howard government and ultimately funded by Labor in 2009, the Investigator was given as ecstatic a welcome as could be expected from scientists standing in wind-driven rain.

"I can't begin to describe the amazing feeling to have it tied up in Hobart," said Toni Moate, executive director of the ship project. "We've been working for over 10 years on this."

But the "pinch me" moment for Australian marine science comes as the CSIRO battles budget cuts, staff redundancies and the closure of 30 science library branches.

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Though Investigator is designed for 300 days per year of operations, Industry Minister Ian Macfarlane confirmed it would only be funded for 180 days' sea time annually.

Mr Macfarlane, the minister responsible for the CSIRO, was in Canberra at government meetings, his spokeswoman said. No government representative was present on the dock and the welcoming crowd was limited to CSIRO staff and families.

Mr Macfarlane said in a statement that the government was spending $161 million this year to secure vital assets like the Investigator, and his spokeswoman said he would attend a "welcome to port" ceremony later in the year.

Labor industry spokesman Kim Carr said: "The value of this ship to Australian science and industry is immense, but the government doesn't even think it's important enough to have a duty senator turn up for its arrival.

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