有關裝修,英文水平太差,有無人可以幫我翻譯下!好急!!

To erect thickness of 100mm / 4 inches light weight block wall ( with 1hour fire resistance certificate ) at the L shape area up to structural ceiling as per the original floor plan of the flat shown.
(plastering / rendering not include. )
油漆批盪用plastering. 沙漿批盪用rendering.而輕磚用的批漿材料性質較接近rendering.

Payment
Please make crossed cheque payable XXX within three days of completion.

請先澄清:
1. 四吋寬是否指 4 吋厚?
2. 輕磚到底是什麽物料? 是否空心砂磚? 或輕石矢磚?
3. 証書証明什麽的? 產地? 材料? 防火標準? 隔熱功效?