All photos are the courtesy of Katarina Bjorkman.

After the ridge pole and purlins are in place, the rest of the roof is put on in layers.  (If you aren't familiar with the ridge pole and purlins, read the article on 'Raising the Ridge Pole'.)

First, tongue and groove pine is laid perpendicular to the ridge pole and purlins.  This can be seen in the photo to the right.

The tongue and groove on the ridge pole and purlins from the inside.

Next, 2X4's are laid on top of the tongue and groove, in line with the ridge pole and purlins.   The tongue and groove is covered with styrofoam.

Then 2X12's are attached to the horizontal 2X4's, running the same way as the tongue and groove.  They are placed 2 feet apart and create a 12 inch tall space in between the styrofoam and strapping in which insulation is put.

The 1X2 strapping is put on top of the 2X12's, horizontally.  The strapping is what the tin is placed on.

In the photo, Bjorn is standing on the strapping, the 2X12's are underneath running from the peak of the roof down to the edge of the cabin.

Next Stage: Tinning the Roof