Sunday, June 21, 2020

The Metric System

It's raining unexpectedly, so I'm stuck inside watching maker videos. Many of them are not in the US, so they use metric.

2x8 joists = 38 x 184 millimeters
Do they call them 50 x 200s? Well, first, they call them timber, not lumber. 2x4s are 47x100s, and 2x8s are indeed 47x200s. Fulham Timber sells 47x200mm Sawn Treated, C16 Graded & Regularised Timber for as little as £11.58 ($14.30) for a 3m length (9' 10"). S4S (surfaced four sides) in US is PAR in the UK--Planed All Round.

4x4 posts = 89 x 89 mm (sold as 100x100s)

1" x 5.4" deck boards = 23 x 137 mm

36" guardrail height = 915 mm

3.4" cable rail spacing = 86 mm (cables are 3.175 mm)

General Rule: 1" = 25.4 mm, so 4" is a little over 100 mm, a foot is 304.8 mm, and so on.

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