Hi
Im studying HNC Construction and I need to find out about defects in timber and how strength maybe afeected.
I would be really grateful if anyone can help me out :)

You may have found your resources by now. But, in case you haven't, or need additional ones, you might look into the information that you find on sites by clicking on the following search.

Construction Defects in Timber Strength - Google Search (http://www.google.com/search?hl=en&q=Construction+Defects+in+Timber+Strength)