If you are a new builder or DIY enthusiast, the first thing you should know about is timber grading. Otherwise, when you go for timber supplies in Dandenong, you will be confused by the terms and grades of the timber you are looking at. So, here is a quick guide on how timber is graded in Australia and which grade of timber is good for the type of work you are going to do.
What is timber grading?
There are many parameters based on which timbers are graded. The parameters are based on what job the timbers are going to do. For example, if the timber is meant for a structural project, then the parameter is strength. If the timber is meant for some décor item, then the beauty or aesthetic appeal is the parameter. So, based on these, there are three ways timber grading is done. They are:
- Structural timber grading based on strength
- Aesthetic timber grading based on appearance
- Durability timber grading is based on the durability of the timber.
Now, let’s take a closer look at these three different grading systems.
Structural grading
The main criterion for grading timber for such grading is the strength of the timber. Rigidity is also taken into consideration. This type of grading is also known as stress grading and is primarily done through three processes: mechanical tests, visual grading and proof grading.
Appearance grading
The colour variation and the natural features of timber are taken into account when grading a timer for appearance. Natural features that are taken into consideration include gum veins and knots. The strength or durability of the timber is not taken into consideration during this kind of grading process.
Durability grading or classification
Most of the time, the main criterion for classifying timber in this parameter is the natural durability properties of the timber in question. The expected service life of the timber, both below and above, is taken into account when labelling a timber as high, reasonably high, moderate or low.
Why is timber grading needed?
Timber grading, most specifically structural or stress grading, is very important for building. This is why when you go to your timber supplier for Narre Warren, they will ask you about the load the timber is going to support. Then only will they recommend timber based on their stress level, or strength grading. If the right kind of timber is not chosen for the project, it can’t withstand the load or pressure of the structure.