The Differences Between MGP10 & MGP12: Which Is Better?


If you are interested or have something to do with timber decking anywhere, you must have witnessed several different numbers and codes used as ratings. These ratings display the approximate time you can expect the longevity of the timber, as well as how strong they are and its ability to stay away from insects.

To help you familiarize yourself with these concepts, I will continue introducing the strength ratings, including MGP and F. Specifically, MGP vs. F timber has different strength under stress.


Different types of timber in an ongoing building construction

Your family and friends tend to enjoy the deck, so stronger timber is a better choice sometimes. The F ratings are mainly for softwood and hardwood. The majority of native forest structural timbers like eucalypt hardwoods and white cypress also use the F grade system.

This type of rating begins at F1, which is the weakest one and ends at F31. About decking, hardwood rated F7 and above is highly recommend. Moreover, F14 is the fundamental working stress.

MGP stands for Machine Graded Pine. MGP is not necessarily your floor, but it tends to be utilized forbearers and joists. The three available ratings are MGP10, which is equal to F5, MGP12, which is similar to F8, and MGP15, which is equal to F11.

Amateurs might wonder what the difference between MGP10 vs. F5, but they are the same thing. For instance, MGP10 is the minimum threshold applied to stiffness properties of around 10,000 MPa. This system also grades the majority of exotic plantation softwoods such as Pinus species.

Overall, the timber used in a particular structural application has to meet the requirements for stress grade defined by the designer/architect. As a part of a long-term series, this article focus on the difference between MGP10 and MGP12. Other comparisons will continue to be updated to help you make the best decision such as the difference between H2 and T2 timber, F5, and F7, etc.

What is MGP10?

As mentioned earlier, the MGP10 strength is equal to the F5 grade. To emphasize the outstanding factors of MGP10, I will make a thorough comparison of MGP10 vs. F7.

Both F7 and MGP10 demonstrate a qualified performance which meets the normal standards. When it comes to choosing the suitable grade for a project, strength and stiffness are the two most important factors to take into consideration.

Additionally, if the plan has been finalized, it is vital that constructors purchase the precise timber grade to make sure that the project maintains its structural integrity. If not, you can choose any grade that you wish.

Initially, mills are likely to examine the stiffness first when grading timber because it is the basic step for structural members. Stiffness indicates how much a beam is related to moisture content, pine defects, and fiber quality. It also reflects how much it will deflect for a given load. MGP10 is the same as 10.0 GPa.

Framing pine of MGP10

Framing pine of MGP10

Another essential factor is bending strength. This indicator measures how much load a beam can endure before it is broken. Bending strength is mainly measured by the location and the number of defects, with huge knots at the boards’ edges that reduce this bending strength.

Particularly, MGP10 is similar to 17MPa (megapascal). Some manufactured MGP10 is capable of achieving 18MPa, thus making it possible for constructors to substitute F7 with MGP10.

Due to the differences in stiffness and bending measures, it is obvious that MGP10 and F7 will achieve different spans concerning structural applications. In some specific cases, F7 can span further while MGP10 can showcase its capacity better in other situations. To be specific, F7 grades are capable of spanning further when the design property requires bending strength as the fundamental factor (i.e., bearers).

Similarly, MGP10 can span further when stiffness plays the important role (i.e., pergola rafters). For instance, F7 can span further when it is utilized as a deck floor bearer because of its stunning bending strength. In another case, MGP10 can span further when it is a deck floor joist due to its higher elasticity modulus.

What is MGP12?

MGP12 is usually made of predominately plantation pine called MGP12 treated pine. They came from forests which are managed sustainably, thus reducing harms to the environment in the long run.

Most importantly, every MGP12 pine is produced in alignment with the fundamental global standards. As indicated in the previous section, MGP12 is the same as F8. As a result, it can sustain a greater amount of strength compared to its inferior peers.

Besides, MGP12 can also be untreated using the H2F Blue Termite treatment, which is the perfect choice for the southern area of Capricorn. Likewise, the H2 Red Termite treatment is the appropriate choice for the northern Capricorn.

Furthermore, the kiln is carefully dried to avoid unexpected damage, not to mention that environmental factors are taken into account these days. MGP12 is a different version of MGP10 regarding material and structure so that individual differences will be discussed in the next part of this article.

What Are The Differences Between MGP10 & MGP12?

The structural frame of MGP10

The structural frame of MGP10

In general, a lot of users state that MGP10 is a great option for all kinds of the wall. To be more specific, MGP10 is considered to be the standard for all walls, ranging from load-bearing walls to stiffer types.

However, MGP10 needs to be customized to be aligned with the owner’s standards. The timber rating does not make any difference, the amount of the timber used is what matters the most. For instance, if you need an enormous opening, triple studs on both sides are needed to support it.

MGP12 tends to be a better choice concerning truss manufacturing. Particularly, taller frames would rather use MGP12 as core studs. This is because they can endure extra reach before you have to opt for LVL studs or hardwoods.

The differences can go deeper into details when it comes to wood-related topics. To support the use of timber, you might need to figure out how to work with woods such as how to burn wood with electricity or how to round wood edges without a router.


Every type of stress grade indicates a different usage, so you need to define the difference between MGP10 and MGP12 to have a precise understanding. No matter what stress grade you are going to use, MGP10 or MGP12, you need to identify your needs first.

What kind of project you want to build, how large is it, to what extent you expect it to be stable, etc. are typical questions. After having your answers, you will know which type of timber you need to choose. Besides, no type is perfect because they have their strengths and weaknesses.