台灣本島扣除高山地區之後，各地年平均相對濕度均在75%以上，屬於高濕環境。過高的濕氣環境會影響人體的舒適度與健康，並導致建材的腐朽破壞等問題，而控制室內濕氣，除了使用空調系統外，利用多孔質建材對室內環境進行濕度調節的「被動式」控制手法逐漸受到矚目。

木質建材作為調濕建材，不但可以提高生活品質，還能夠減輕環境負荷。在室內裝修中，通常會在木質建材表面上施作塗料以保護建材。然而木質建材塗裝後的調濕效果，卻甚少研究提及。

本研究探討市面上常見的木質建材-南美柚木以及雲杉，經由木蠟油、水性塗料、NC塗料以及PU塗料塗裝後，對調濕性能造成之影響，根據ISO 24353: 2008與CNS 15200-1-7分別對材料的調濕性能以及膜厚進行測試與資料分析。研究結果如下：

(一) 南美柚木與雲杉試材，塗裝吸濕量比未塗裝吸濕量的比值反映出，木蠟油塗裝對木質建材吸濕量影響最小，比值為0.7到0.8；影響較小為水性塗料試材，比值為0.4到0.5；影響最多為PU塗料試材，比值為0.2到0.3；而以NC塗料試材落差較大，介於0.2-0.6之間。

(二) 以日本建材測試中心吸放濕量評價基準來評估試材調濕性能，除了木蠟油試材在第6小時及第12小時進入等級1之外，其餘塗裝試材皆未達評價基準。如以MBV評估試材調濕性能，以木蠟油試材和水性塗料試材評估結果為「佳」，其餘試材評估結果皆在「普通」以下，顯示木蠟油及水性塗料試材，調濕能力較佳。

(三) 塗膜厚度與吸濕量呈現高度相關，其中以南美柚木NC塗料試材與木蠟油試材最為明顯，R2值分別為0.8617與0.9517，顯示膜厚越厚，吸濕量越少。但雲杉NC塗料試材，同樣膜厚5μm，吸濕量的差異卻達到30 g/m2，推測為塗料成膜狀況不佳，因此塗裝時，須特別注意成膜的品質。

According to Central Weather Bureau of Taiwan, the monthly average relative humidity (RH) for the major cities in Taiwan is over 70%. High humidity will have effects not only on users’ comfort and health, but also on the corrosion of building materials. Therefore, to develop the strategy to cope with the high RH environment in Taiwan is necessary.

Moisture buffering materials, which are porous building materials, are potential for the reduction of RH peaks. Moisture buffering materials can be regarded as a passive design method used to control the indoor RH. However, in the real situation, most of the moisture buffering materials, like wood materials, will be treated with coatings for protection and decoration purposes. Few study discussed about the effect of finishing coatings on the performance of the moisture buffering materials.

In this study, the moisture buffer capacity of two wood materials, Basralokus and Spruce, with coating are investigated. Four types of coating are applied on wood materials, including wax, PU coating, NC coating, and water-borne coating. The test procedures are followed by ISO 24353 and CNS 15200-1-7. The results show that substrates with wax have the best moisture buffer capacity of all. Besides, film thickness and the conditions of surface film might also have influence on moisture buffer capacity of the materials.

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