用原材料把縫修到小於3/8. 用防火sealant.

https://www.amazon.com/3M-CP-25WB-10-1-Barrier-Sealant/dp/B00176M30Q/ref=sr_1_4?crid=3MJ5GQP91ZIH8&keywords=3m+cp25wb%2B&qid=1576428290&sprefix=3m+cp2%2Caps%2C361&sr=8-4

所有跟帖： 

• 沒有經驗，請問是什麽樣的原材料？ -望麓園- ♀ (0 bytes) () 12/15/2019 postreply 12:58:59

• 鬆動的去掉, 鑿掉, 用水衝洗幹淨, 半幹時, 用水泥灰槳stucco填充 . 5天後, 有縫隙的地方用sealant 再填。 -PrimeryColor- ♀ (0 bytes) () 12/15/2019 postreply 20:04:32

• 謝謝！！！ -望麓園- ♀ (0 bytes) () 12/16/2019 postreply 19:20:08