Treated timber. Getting eaten out!

 Treated pine framing used in a subfloor being eaten by termites.

Treated pine framing used in a subfloor being eaten by termites.

Manufacturers of treated timbers my warrant it against termite attack, however, if you carefully read their terms and conditions, you'll notice that they won't warrant timber that's in ground contact.

http://www.chhwoodproducts.com.au/index.cfm/pageid/157/viewpage/brochures

If you look at the warranty brochure for this treated pine frame, you'll notice that things such as storing the timber on the ground, in high moisture environments or anywhere that can cause fungal decay will void the warranty. So be careful not to rely just on treated timber to prevent termite damage.

By and large, termite treated timbers do work well in resisting termites, but only if they are used in accord with good building practice and the treated timbers manufacturers recommendations.