When and How to replace rotten hardboard siding on your home

​Hardboard lap siding has been used on homes for years because it mimics the look of wood siding but is much less expensive. One of the disadvantages of hardboard siding is that exposure to water can cause it to deteriorate over time. This is most common on the bottom few courses near the foundation.

If you have this problem, you might want to consider replacing the rotten courses of hardboard siding with more durable fiber cement siding. Fiber cement siding is available in the same look and dimensions as hardboard siding but is more resistant to water damage.  Consult with a professional in your area, like Boyd Construction Co Inc in the DC area, for a free estimate.
Some helpful tips for those that would like to venture into the DIY of siding repair:

Tools Needed:

• Tape measure
• Hammer
• Chisel
• Pry bar
• Circular saw with masonry blade
• Caulking gun
• Paintbrush

Materials Needed:

• Plywood sheathing
• 15-lb. builder’s felt or housewrap
• Fiber cement siding
• Hot dipped galvanized or stainless steel nails
• Paintable exterior caulk
• Exterior paint

How to Remove and Replace Siding:

1. Remove Damaged Siding: Remove the deteriorated hardboard siding using a pry bar and chisel, being careful not to damage the good siding above it.
2. Replace Rotten Sheathing: If needed, replace the sheathing behind the siding using 1/2” plywood covered with builder’s felt or housewrap.
3. Cut Fiber Cement Siding: Cut the fiber cement siding to length. Always wear an approved dust mask or respirator when cutting fiber cement.
4. Install Fiber Cement Siding: Nail the fiber cement siding in place so the rows are consistent with the rest of the wall. Fiber cement siding can be blind nailed near the top of the siding to eliminate exposed nails. Nail the top course of fiber cement siding through the lower course of hardboard siding.
5. Caulk and Paint Siding: Caulk the end joints in the siding, then paint the siding with quality exterior paint.