posted 11 years ago
A split will generally get thinner as it progresses along the wood. If many splits were started from the same end, that end of the block becomes thinner. The block would run out of thickness at that end, producing a wedge of wasted material roughly the shape of a door stop.
There are some good YouTube videos that concern the making of hazel hurdles in England. The guy uses a bill hook knife to split hazel coppice and he demonstrates how to manipulate the wood to keep the split running true.
Don't use exceptionally green wood. As the shakes dry, they shrink away from the nails and can split themselves.
If splitting somewhat green wood, dry them in the shade so they don't cup too badly. Turn them over once a day. In a dry climate, a couple days dry time might do it .
Cupped shakes look better and catch less wind when the cup faces down.
Do you know about dulling nails if they tend to split as they are nailed ?
Often the sapwood is less durable. With most wood, the inner wood is darker. Trim off sapwood if there is no shortage of material.
Icicles and any build up of debris affects the bottom coarse the most. Use your highest grade material for the bottom few rows.
If inexperienced installers are employed, be sure that they don't kneel on shakes and split them. Also be sure that they use a variety of widths of shakes from the beginning. Some guys will tend to select only nice wide ones. This results in having to piece together the upper rows with too many narrow shakes.