Your door frame rough opening doesn't match the standard precut door size — the leg needs to be trimmed to height, and you need something that takes paint cleanly without warping or splitting. A mismatched jamb leg means callbacks, and fingerjoint material that telegraphs knots through the prime coat means extra prep work you didn't budget for. 4-9/16-inch width by 6-foot-8-inch height primed jamb leg in fingerjoint pine. The 4-9/16 width covers most standard residential exterior door jamb depths in this region. Fingerjointed pine with a factory prime coat gives you a solid wood core that accepts paint without the telegraphing of knots that happens with lower-grade materials. FJ construction handles the moisture shifts common in Nebraska and Iowa installs better than solid wood with visibl Stocked at Crofton Lumber and Akron Lumber.