How do I fix a rotting deck board without replacing the entire deck in Moncton?

Individual rotting deck boards can absolutely be replaced without tearing out the entire deck, provided the underlying joists and structural framing are still sound. This is one of the most common and cost-effective deck repairs in the Moncton area, and it is well within the ability of a handy homeowner to complete in a weekend.

Before you pull out a single board, you need to assess what is happening underneath. Remove the rotting board or boards and inspect the joists they were sitting on. Press a screwdriver or awl into the top surface and sides of each joist. Sound wood will resist penetration. If the screwdriver sinks in easily, the joist has rot and you have a bigger problem that needs to be addressed first. Joist rot prevention should always be part of any deck repair project. Apply joist tape such as Trex RainEscape or G-Tape to the top of each exposed joist before installing new boards. This self-adhesive membrane prevents water from pooling on the joist surface, which is the primary cause of joist deterioration. Make sure there is adequate ventilation underneath the deck as well, since trapped moisture accelerates rot in Moncton's humid summer climate.

To replace the rotting boards, start by removing the screws or nails holding them to the joists. If the boards are badly deteriorated, they may break apart as you remove them, which is fine. Use a pry bar to lift out any remaining pieces and pull all old fasteners from the joists. Measure the length of the boards you are removing and purchase replacement boards of the same width, thickness, and material. If your existing deck is pressure-treated lumber, match it with new pressure-treated material. The new boards will likely be a lighter colour than the aged surrounding boards, but after a season of weathering and a uniform application of stain or sealant, the colour difference blends significantly.

When installing the replacement boards, use exterior-rated deck screws rather than nails. Screws hold better over time and are easier to remove if you ever need to do future maintenance. Pre-drill the screw holes near the ends of the boards to prevent splitting, especially with pressure-treated lumber that may still be relatively wet from the treatment process. Leave a 1/8-inch gap between the new boards and the adjacent existing boards to allow for drainage and seasonal expansion.

This kind of targeted board replacement falls into the minor repair category, typically costing between $500 and $2,000 depending on how many boards you are swapping out and whether you hire someone or do it yourself. A single board costs $15 to $40 depending on the species, length, and treatment, so the material cost for replacing a dozen boards on a typical Moncton deck is quite manageable.

The bigger question is whether spot repairs make sense for your particular deck, or whether you have crossed the threshold into full replacement territory. A general guideline is that if more than 50 percent of your deck boards are showing signs of rot, or if multiple joists are compromised, or if the footings have heaved repeatedly from frost, you are better off replacing the entire deck rather than continuing to patch it. A pressure-treated deck in the Moncton climate has a realistic lifespan of 15 to 25 years with proper maintenance. If your deck is approaching the 20-year mark and you are replacing boards every year or two, the cumulative repair costs will eventually exceed the cost of building new.

After replacing the boards, power wash the entire deck surface at 1,500 to 2,000 PSI using a fan tip held at least 12 inches from the surface. This cleans the existing boards and prepares everything for a uniform coat of stain or sealant, which will help the new and old boards blend together and protect the whole surface going forward.

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