Joe_Carrick

Metric Conventions

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For you metric users, I have a question about how areas are generally indicated on your projects for various components.

 

1.  Site, Rooms, etc in Sq.Meters(sq.m.)?

2.  Doors, Windows, Counter tops in Sq.Centimeters (sq.cm.)?

3.  Other items ?

4.  Is anything (such as cross sectional area of framing members, etc) in sq.mm. ?

 

IOW, what are the standards?  For Imperial projects we use a combination of Sq.Ft. and Sq.In.

My guess is that metric would generally use Sq.M. ad Sq.Cm. but I really don't want to guess.

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Joe,

 

We usually use m² for site and floor areas.

Same for counter tops, windows, doors, etc - this format can cover a huge range of areas.

We may see sq m sometimes, but I try to avoid that.

If a property is very large, we will use hectares. (1 hectare = 10,000 m²).

It is not usual to call up cross section areas for framing members, but if the area were very small, we would use mm² - I don't think I have ever used this. 

We never use square or lineal centimeters.

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Thanks Glenn,

 

I have bee working on some Macro Packages for Area Analysis [building, Site, Openings (Doors & Windows), Vents] and also a basic structural member sizing package] which I want to make sure works for both Imperial and Metric.  Based on your input, I will make most things in sq.m.

 

Thanks

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Based on your input, I will make most things in sq.m.

 

 

Joe,

I hope you are going to do it in m² and not as sq m.

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Some more questions:

 

In the USA & Canada most building products are Imperial units (ie: 48"x 96" Sheet Goods, 2x4 (1.5" x 3.5") Lumber, etc.

These are not round numbers in metric so I would assume that outside of North America those materials come in different sizes. 

 

What are the common sizes in Australia, Europe, etc?

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I see on the web that Australian sheets of particle board are 1200x2400 (slightly smaller than North American).  So that would match up with framing spacing, etc.

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Joe

Gib (sheetrock) 1200mm or 1350mm wide x various lenghts ie 2400,3000,3600,4200,6000.

Other products -ply 1200x 2400mm or 2750mm

                         - MDF flooring  1800mmx3600mm

                         - Hardies sheets 1200X2400mm or 2700mm

                          framing timber typically 45 wide x 90,140,190,240,290mm deep

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We used to have particle board 8 foot x 4 foot then it became 2440mm x1220mm  then we went fully metric and it was rounded to 2400x1200

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frame centres typically 600 for std single story but varies for wind zones and earthquakes and stud height to 400mm or 300mm

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Thanks Graeme.  I really appreciate the info.  I notice that all of those are mm which I believe is the standard for linear measurements but for areas it's m2.  Is there a cut off point where area is cm2 or mm2?

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Joe

We DO NOT use cm for anything. cm is a non standard ISO unit.

mm² is only used for gutter cross section area and similar that I can think of off hand

 

cheers

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