Trading in framing lumber in the US markets slowed down during last week, as did upward momentum in prices. Even so, prices in most species gained modestly and the Random Lengths Framing Lumber Composite Price finished at $512, a new record.  Gains came early in the week, with the composite holding at its midweek level and sales finishing with a quiet tone. Buyers held back, unwilling to pay record prices when shipments were several weeks out and mills were indicating shipments might be later still due to traffic issues.      Week Mar ...