Two things,
1. the news reports here indicate its a 27% duty and
2. The US can appeal, dragging this out (it seems) interminally..

Its already been going on 2 years..it seems they'll just keep it up til they
get the result they want, meanwhile, the extra overhead is passed on to who
?
The US consumer..

And the Canadian millworkers also suffer too. This all sucks. The
NAFTA panel has told the US Govt to stop fighting the rulings.

Today's Globe and Mail Report on Business reports that the WTO has
"given Canada the go-ahead to slap trade sanctions on the U.S., which
could amount to billions of dollars if Washington hands the more than
$2.7-billion (U.S.) in softwood levies collected from Canadian timber
over to American forest companies."