本研究採用臺灣杉（Taiwania cryptomerioides）、杉木（Cunninghamia lanceolata）及柳杉（Cryptomeria japonica）等三種疏伐樹種、三種集成元等級及間苯二酚樹脂（Resorcinol formaldehyde resin, RF）和乙烯脲酯膠合劑（Vinyl urethane adhesive, KR）二種膠合劑做為直交集成板（Cross laminated timber, CLT）製備條件變因，並評估燃燒性質。試驗結果顯示CLT初期燃燒時之重量損失率與木材強度等級呈反比關係，其M30與M90之柳杉製成CLT試材具有顯著性差異（p< 0.05）。經30 min燃燒試驗後得知不同等級柳杉利用KR膠合劑製成CLT之燃燒特性與使用RF膠具有相近的重量損失率及碳化速率（p > 0.05），經60 min燃燒試驗後RF做為CLT膠合劑可獲得較KR者低之重量損失率（Weight loss）及碳化速率值（Charring rate）；無側向膠合CLT經30 min燃燒與同等級有側拼者之重量損失率及碳化速率值無顯著差異（p>0.05）。此外，於膠合強度方面顯示使用RF試材具有比KR較低之剝離率，其範圍為0～3%，表示使用RF所形成之膠合層比KR具有較佳之膠合性質。再者，經過燃燒後CLT之抗壓載重下降率皆介於30～40%，其中樹種、膠合劑、集成元等級等變因對於強度下降率無顯著影響。

This study evaluates the combustion properties of lamina made from three thinned coniferous wood species from Taiwan: Taiwania cryptomerioides, Cunninghamia lanceolate and Cryptomeria japonica. The laminas are graded into three levels and glued with two types of adhesives: resorcinol formaldehyde (RF) and vinyl urethane (KR) adhesive as the conditioning variable for the preparation of cross laminated timbers (CLTS). The test results show that the weight loss in the CLTs after initial combustion holds an inverse relationship with their mechanical stress grading. Specifically, CLTs made of C. japonica with M30 and M90 laminas show the significant difference (p < 0.05). After 30 minutes of combustion tests, the separate combinations of different grades of C. japonica along with KR and RF as the adhesive show similar amounts of weight loss and charring rate (p > 0.05). Alter 60 minutes of combustion test, RF can be used as a CLT adhesive to obtain lower weight loss and charring rate than KR. There was no significant difference in weight loss and charring rate between non-edge-glued and edge-glued CLT of the same grade after burning for 30 min (p > 0.05). Moreover, in terms of adhesive strength, the test samples using RF exhibit a lower delamination rate compared to KR, ranging from 0 to 3%. This indicates that the bonding layer formed by RF has better adhesive properties than KR. In addition, the reduction rate in compressive load capacity of CLT after combustion falls within the range of 30~40%. Factors such as timber species, adhesive type, and lamina grading level show no significant effect on the strength reduction rate.