Repairing termite damage is a multi-step process that involves more than just swapping out old boards. It requires a structural assessment and a plan from a specialized restoration contractor to ensure the home's integrity is restored.
Step 1: Elimination Before Repair
The most critical rule of termite repair is that you must eliminate the infestation before you fix the damage. Repairing wood while termites are still active is a waste of resources, as the new lumber will likely become their next meal.
Methods of Repairing Wood
1. Sistering (Reinforcement)
Sistering involves attaching a new, structurally sound piece of lumber to the side of a damaged one. This is common for floor joists. The new board is bolted or nailed to the old one, transferring the structural load to the healthy wood. For complex cases, a specialized restoration approach is required to ensure the repair meets building codes.
2. Full Replacement
If a piece of wood is so severely damaged that it can no longer carry weight or support a sistered board, it must be completely removed and replaced. This is often necessary for sill plates or wall studs.
3. Partial Replacement (Patching)
For non-structural, cosmetic damage (like trim or siding), the damaged section can often be cut out and a new piece of wood spliced in.
Specific Structural Repairs
Floor Joists
Often repaired by sistering 2x8 or 2x10 lumber alongside the original beam.
Sill Plates
Requires jacking up the house slightly to slide out the old plate and install a new pressure-treated one.
The Importance of Pressure-Treated Lumber
When making repairs, especially in crawlspaces or near foundations, always use pressure-treated lumber. This wood is infused with chemicals that make it resistant to rot and less attractive to future termite activity.
A Note on Cosmetic Repairs
While painting over or filling minor holes with wood putty can make the damage disappear visually, it does nothing to restore the strength of the wood. Always ensure structural stability is addressed first.