"incising is practiced primarily on douglas-fir, western hemlock, and western larch ties and timbers for pressure treatment and on cedar and douglas-fir poles. incising can result in significant reductions in strength (chap. 5).". These wet-use incising factors are applied in addition to the traditional wet- use service factor, which recognizes that green lumber is not as strong as dry lumber. in the united states, the new 1997 national design specification for wood construction (nds) (af&pa 1997) recommends an al- lowable stress design adjustment factor (c,). Incising factor - the nds incising factor, ci, is not currently accounted for. bearing area factor - the nds bearing area factor, cb, is not currently accounted for. curvature factor - the nds curvature factor for glulams, cc, is not currently accounted for..
Incising is a process by which uniform cuts are made in the wood to improve the penetration of the preservative during treatment. keep out: certain chemical preservatives are unwelcome contaminants in the mulch and wood fuel markets. Incising. incising is a process in which to prepare wood for preservative treatments. sharp steel teeth are pressed into all sides of lumber and timbers to increase the penetration of the chemical into the wood during the incising process.. Use conditions. these wet-use incising factors are applied in addition to the traditional wet-use service factor, which recognizes that green lumber is not as strong as dry lumber. in the united states, the new 1997 national design specification for wood construction (nds) (af&pa 1997) recommends an al-lowable stress design adjustment factor (c i).
