We need to update our home making ability to build in Metric. Frist, please stop calling 2x4s - 'two by fours', why? Becouse they are not two by fours! 90x40 mm studs are truer to actual dimensions!

Here is a new way to construct your home, and be more energy and material efficient. Instead of the outdated 16''-24'' stud spacing of 2x4, you use 500 mm stud spacing and double 90x40 mm stub wall. Why? First, 500 mm spacing falls in between the old spacing, saves wood compared to 16'', and is stronger than 24'' spacing.

Secondly, by using a double wall of 90x40 mm studs, on the outside walls, is better than using one 140x40 mm stud, because the wall is thicker by 40 mm, for more installation, and don't need big trees to make studs, and the way you construct the wall, you weave the installation between the studs, so there is no cold weak link to the outside. As showing in the illustrations.

When ordering for dry wall, order in whole metric lengths, if you are ordering for the whole house you will have a truck load, the manufacture will be glad to offer any length you want....

Step 1: Inside Wall

Lets look and an interior wall...
Here is a version of how the inside walls will be constructed compared to old spacing, you save on the number of studs....

Step 2: Outside Metric Wall Constuction

The outside wall is constucted with a double wall, in order to break the thermo barriers that the studs cause. With this construction you are able to weave insulation, in and out of the studs, there is no place where the studs penetrate completely through the wall, increasing U value. The bottom and top plates and end studs can be 140 mm width, to tie the whole unit together, or of two complete walls of 90x40 boards for a thicker wall by 40 mm. This is now, the only thermo weak spots on the wall. Also, you can easily attach your electrical wiring, by weaving and stapling on the inside of wall, without drilling a lot of awkward holes and weaken the studs.

Now, we need to convince the lumber industry to start making Metric dimension building material, like three meter long plywood sheets instead of 96" long. Drywall can easily be cut to three meter lengths. They can keep the width the same 48" or 1.22 m, for now. Or 2.5 m x 1.25 m sheets might make more sense...