How to Repair Fiber Cement Siding | DoItYourself
Use thin-set mortar to repair cracks or holes in cement boards. Step 3: Mix up a small amount of thin-set mortar following the manufacturer's instructions. Thin-set mortar typically has a working time of less than 15 minutes, so smaller batches are the way to go. ... Fiber cement siding can be nailed by hand or with a pneumatic nailer. It can ...