Dive summary:

• Observers had predicted that builders were accelerating production faster than materials suppliers would be able to bring back production capacity that they shrank during the recession, and that appears to be happening now.
• About a fifth of home builders said in survey answers that they are having problems getting what they need, including wall board, oriented strand board and framing lumber.
• It appears they are not, however, having trouble getting enough copper wire, vinyl siding, HVAC equipment, insulation and structural insulated panels.

From the article:

Among lumber dealers, 27 to 28% reported shortages of OSB and plywood, 36% reported shortages of framing lumber and 12% reported shortages of wall board. ...