Lumber prices topped $1,000 last week, a record high and a promising sign of a rebound in demand for building materials as the economy recovers from the coronavirus pandemic. Craig Johnson, chief market technician at Piper Sandler, said the charts forecast even more upside ahead.  “Stay seated, but it looks like you could have 30-35% more upside, based upon the size and technical breadth of this technical setup here for lumber prices. There’s no doubt that lumber prices are going higher,” Johnson told CNBC’s “Trading Nation” on Friday.  Johnson said three ...