CCA Pressure Preservative Treatment of Hem-Fir Heartwood Brush Treated with a Water-Repellent Fungicide

Fifty hem-fir freshly cut, heartwood boards were sawn in half to produce end-matched samples. One of each pair was brushed with a water-repellent/fungicide solution containing sodium penta- and tetrachlorophenate. All 100 test samples were kiln dried and pressure treated with the waterborne preservative, chromated copper arsenate (Type C) using a full-cell process with a pressure of 1030 kPa applied for 5 hours. The average CCA retentions for the control and pretreated boards both exceeded 8 kg/m3 while the average penetrations were 1.2 and 1.1 cm, respectively. Analysis of the penetration and retention of the CCA preservative showed that neither was affected by pretreatment of the lumber with a water-repellent/fungicide solution.

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