Knotholes splits, and wine is permitted. Voids usually are not loaded and these beams need to in no way be subjected to see. Framing look is usually in some cases called “Strike & Overlook”. The first universally identified conventional for wood I-joists was, and even now is, ASTM D5055, Common https://prefabricated-glulam-beam57325.dailyhitblog.com/28959499/an-unbiased-view-of-glulam-custom-sizes