Cochrane Street Paddington Project 

Framing is exactly that, building frames, in our case we used treated pine. Your engineering plans must specify the requirements for framing (e.g. H class, strengths, having double bottom and top plates etc.). The terms used are studs (uprights), noggins (short horizontals), top plate and bottom plate. Noggins can be MGP10 

There are a few things to consider when using framing timber:

• hazard (or treatment) class (e.g. H3)
• strength and appearance (e.g. F rating or stress grade such as F5 and F7, MPG10 or MGP12)
• thickness (e.g. 45mm)
• width (e.g. 90mm)
• lengths (e.g. 6000mm)
• span tables (e.g. wall height)
• LVLs

Hazard (or treatment) class

There are several classes being H1, H2, H3, H4, H5 and H6.We’re not gong to regurgitate all the facts, but instead focus on the tow most commonly used classes for framing being H3 and H4. (details taken from a page called Qld Government Using Treated Timber).

H3 is suitable for use where the wood is kept off the ground but exposed to weather or periodic wetting and designed to reduce the likelihood of attack by insects (including termites) and decay.

H4 is appropriate for use where the wood is in contact with the ground or is continually damp and designed to reduce the likelihood of attack by insects (including termites) and severe decay where a critically important end-use is involved (such as load-bearing walls).

Strength

An “F” system in timber grades indicates its strength, with higher grades signifying stronger timber. Typically, unseasoned hardwoods rate around F14/F17, while kiln-dried hardwoods are stronger, ranging from F22/F27. For example, in the case of F17 vs F27 hardwood, F17 can withstand higher stresses/loads compared to lower F-grades, whilst F27 hardwoods offer even greater strength and durability. 

Pine is weaker, usually at F5/F8, but some exceptionally strong species can reach up to F34. You can consider F5 timber for applications needing softwood timbers.

(Source: OneFlare)

There are several types of strengths, such as MGP10, MGP12 and MGP15. 

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