木材優先使用權一詞出現在「The Wood from The Trees：The Use of Timber in Constructionr」用來判別何種木材，可以開發出具體的案例研究，來證明何種木材能在建築結構中發揮最有效的環保和經濟效益。本研究摘取前述之詞彙，試圖比較在國內興建一棟高層集合住宅，材料分別由木構造和鋼筋混凝土構造，進行成本和工期之評估，並針對木構造由設計到施工組裝之建造流程，尋找出各階段之減少時間及金錢成本之可能性，藉此引導未來使用者在建築材料決策中，進行材料使用權的評估與判斷。

本研究延續「Concrete Apartment Tower in Los Angeles Reimagined in Mass Timber」，此研究證明高層木構造在地震帶具有當地法規所需之結構能力，以該研究20層集合住宅建築作為本研究參考模型。根據材料運輸限制、施工組裝便利性以及結構性之考量，對原研究模型進行修改，例如新增樑結構及修改樓板大小。本研究分別對木構造及鋼筋混凝土構造進行造價成本及施工期程的分析比較，兩構造型式在相同的總樓地板面積情況下，木構造建築之主結構體每坪造價比鋼筋混凝土構造約高出15,513元/坪，此差額約為營建施工結構工程費用中的37.2%。施工工期依分析所得結果，本研究模型木構造之營建工期每層樓比鋼筋混凝土構造快了約15日曆天，20層樓總樓地板共22180平方公尺之建築，總工程之工期差異可達120日曆天。

而從木構造減低成本的角度來探討，在建造項目成本比例中，材料項目占了總體的96.96%，其中包含木材運輸、製造加工、耗損和海運資料文件下櫃費。

The term, wood use priority, appears in ‘’The Wood from The Trees：The Use of Timber in Construction’’ to identify which wood can be used to develop specific case studies to demonstrate the more efficient use of wood products in structural construction. I extract the vocabulary and attempt to compare cost and construction period that we build a high-rise complex housing by wood and reinforced concrete. For the construction process of wood construction, from design to construction stage, the possibility of reducing the time and money cost of each stage is sought, thereby guiding future users to evaluate the cost and time from materials in the decision of building materials.

This research continues "Concrete Apartment Tower in Los Angeles Reimagined in Mass Timber”, which demonstrates high-rise wooden building have the structural capabilities required by local regulations in seismic area. I take 20-story residential buildings from it as a reference model. The original research model was modified according to material transportation restrictions and structural considerations, such as adding beam structures and modifying the floor size.

The construction period and cost of the wooden structure and the reinforced concrete structure are analyzed and compared respectively. Under the same floor area of the same building, the cost of main structure in wooden building is amount of 15,513 NTD / ping(3.305m^2) higher than the reinforced concrete structure, the difference is about 37.2%. According to the analysis results, the construction period of the wooden building is about 15 days each floor faster than the reinforced concrete building, and the total floor area of the 20-story building is 22180m^2, the difference in the duration of the total project can reach 120 days.

From the perspective of reducing the cost of wooden construction, material projects accounted for 96.96% of the total cost of construction projects, including timber transportation, manufacturing, processing, and shipping documents.

Key words: High-rise wooden building, Construction cost, Construction period, Sustainable development.

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