Because of the interlocking fibers of the sawdust holding the pykrete together.

Of course it is! Pykrete is awesome.

Also, when the snow melts you'll have a shed for a little while.

If you enjoy the taste of sawdust, I don't see why not. Good luck biting into it, though.

On an episode of the UK-broadcast "Brainiac: History Abuse" TV series, it was proved that a block of ice is melted by a flame-thrower within two minutes. The pykrete on the other hand, was left virtually uncharred after several minutes of torture from the flame-thrower.

Liquid nitrogen is very expensive for this task.