Preschem FAQ









Preschem FAQ

Preschem has added a lot of new FAQ to this page. To keep them in a logical order, we’ve added categories and grouped them accordingly. To see the FAQ under each category, please click to expand or collapse the FAQ. Then click on the question to see the answer.

Timber Issues

No-Rot and No-Rot Gel have a very limited ability to control termites, while Timber Preserver has no ability to do so. If you find termites in your home, then the only safe course of action is to contact a registered pest controller who specialises in termite infestation. They will be able to asses the damage done and a course of action to eradicate the termite nest.

Category: Timber Issues

In this situation, you have what is known as sapstain or bluestain mould. While this won’t do a lot of damage to timber, it may visually mask the onset of decay. The best way to determine if there’s rot is:

  1. to probe the timber with a flat head screwdriver. If the tip sinks in easily, you have rot.
  2. If the first test is positive, smell of the timber. If it smells a little like mushrooms, then it might be rotting.
  3. hit the timber with a hammer. if it sounds solid then it’s fine. If it sounds dull, then it could be rotting.
  4. drill one or two small holes in an area you think are suspect and capture the shavings.
    1. notice the resistance on the bit when drilling. rot is very easy to drill through
    2. notice the colour the shavings are. if its dark brown and its a blond timber, then its indicating rot
    3. smell the shavings and if it smells like mushrooms then it’s rot.
    4. rub the shavings between your fingers. if the shavings crumble then its rot

If you have ticked off a lot of positives from the tests above then it can become quite tricky to determine what course of action you need to take. If you have rot in the sub-frame or stumps, then you’ll need to call an expert such as a licensed builder. If you’re still unsure and you’ve had one or two indicators that there is rot above, call in the builder.

After you or a builder have established that the timber is not badly effected, or you’ve had to conduct repairs and replacement, and you want to treat the timber to prevent rot in the future:

  1. Check and improve ventilation under the house. Often the vents are cloged with plants or soil
  2. See if there is evidence of a leaking pipe, as that is a comon cause of dampness under the floor
  3. Apply No Rot Gel to prevent rot from spreading or re-occuring.
Category: Timber Issues

Preschem has discussed borer treatments and their life cycle in this news post on the website. Unfortunately, once you have noticed the pin holes and dust/fras, the adult beetle has emerged from the wood and done its damage. But here are the things you can do to try and prevent further damage.

  1. Photograph the holes to assist you in identifying new borer activity
  2. Treat the timber with either Clear Wood Preservative or No-Rot Gel
  3. Monitor the timber for signs of new holes for 2-3 months afterwoods and retreat if necessary

To figure out which product is suitable for your situation, then:

  • If the timber is sealed with a varnish or paint or is external and exposed to the weather, use Clear Wood Preservative. Note: Clear Wood Preservative can be flooded into the pin holes with a small needless syringe, It can even blown in with a hear dryer (use the fan only, no heat)
  • If the timber is raw and internal, use No-Rot Gel
Category: Timber Issues
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