When animals are exposed to softwood shavings the aromatic hydrocarbons are absorbed through the respiratory tract and enter the blood. The acids given off by pine and cedar shavings are very damaging to the respiratory tract. These acids can actually destroy cells that line the lungs and trachea (2).For a complete summary of the respiratory toxicity of pine shavings, go to. .hen animals are exposed to softwood shavings the aromatic hydrocarbons are absorbed through the respiratory tract and enter the blood. The acids given off by pine and cedar shavings are very damaging to the respiratory tract. These acids can actually destroy cells that line the lungs and trachea (2).
Bowstring trusses are made with a curved top chord and a straight bottom chord. The top chords were originally made with multiple leaf chords where the curvature was cut into the solid sawn chord members.A second style of bowstring truss used glued-laminated chords. The top chord in these trusses was curved in the laminating process.While these trusses have carried the roof load for decades, it is not uncommon to receive calls regarding broken trusses following a heavy snow event.he top chords were originally made with multiple leaf chords where the curvature was cut into the solid sawn chord members. A second style of bowstring truss used glued-laminated chords. The top chord in these trusses was curved in the laminating process.
Pre-manufactured stock trusses are constructed with Spruce Pine Fir (SPF) or Southern Yellow Pine (SYP) lumber. They are designed at a 4/12 pitch to be spaced 2 foot on center. These trusses the meet building code criteria as specified by Structural Building Components of America (SBCA) and the Truss Plate Institute (TPI). 24 in. On center; 4/12 Pitch