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What type of product should I use to fill nail holes in fiber cement siding? Nail holes are from a flag pole I removed.

mmathis
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Virginia
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  • Urethane caulk is available in custom colors to match your siding (assuming factory paint). I'd contact the manufacturer. – isherwood Sep 07 '17 at 16:20
  • scrape a hidden portion of the board to get some dust to mix into the wet patch material for best matching. – dandavis Sep 08 '17 at 13:50

2 Answers2

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The installation guide for Hardie Board, which is a brand of cement board siding recommends using caulking to fill nail holes. When I've installed it I used a high-quality exterior paintable calking after smoothing the edge of the holes.

Once the caulk is dry you can touch up the paint.

JPhi1618
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I have been caulking screw holes and joints in Hardie Cedar Mill 4' x 8' sheets with Quad Max, no problems, seems to work great.

George
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