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Forums › Home Workshop DIY › Actual timber sizes vs notional

mdf

mdf

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#207338 19-Dec-2016 21:42
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I am trying to complete a project without visiting Bunnings 27 times. I'm building an outdoor cabinet storage thing that will need framing with something reasonably lightweight though ideally treated. I'd prefer something with a roughly square profile. I've seen standard sizes include notional 45x45mm and 45x35mm, but does anyone know what the actual sizes of these are are for when I work up my plans? 

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Disrespective
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  #1692564 20-Dec-2016 08:25
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Timber comes in various nominal sizes. They're Rough Sawn, Band Sawn, Green Gauged and Dressed. All can be called up as Ex. 100 but all will be slightly different final measured sizes.

 

- Most internal finishing timber is what's called dressed. It's the finest finish, smooth, and ready to paint (mostly). (90mm)
- Green Gauged is what structural framing is. It's going to have radiused corners and some defects so not ready for paint. (94mm)
- Band sawn is a rough surface on the timber which would be ready for stain. (~94mm) But I can't actually be 100% sure here, i'd need to call a timber rep.
- Rough sawn is pretty much straight from the mill saw. It's rough, and really only good for fencing. (100mm with tolerance of -1 to +3mm)

 

Call sizes are: 40, 50, 75, 100, 125, 150, 200, 225, 250, 300
Gauged are:   37, 47, 69, 94,   119, 144, 194, 219, 244, 294
Dressed are:  35, 45, 65, 90,    115, 140, 180, 205, 230, 280
Dry framing:  35, 45, 70, 90,    120, 140, 170, 190, 240, 290

 

In your examples 45x45 would be a dressed piece of 50x50, and 45x35 would be a dressed piece of 50x40.

 

 

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