If the rot extends into the jack studs or the rough sill below, stop. Call a carpenter. But if it’s just the visible sill and the first inch of substructure, you’re in business.
Finally, he replaced the broken glazing bead that had started the whole tragedy, bedding it in fresh glazing compound. how to repair rotted window sills
If the damage is more extensive, it may be necessary to install replacement wood. Cut the replacement wood to fit snugly into the damaged area, using a drill to screw it into place. Use wood glue to secure the replacement wood, and clamp it into place until the glue dries. Make sure the replacement wood is properly aligned and evenly spaced. If the rot extends into the jack studs
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Darker or grayer patches than the surrounding wood often signal fungal growth. Finally, he replaced the broken glazing bead that
If the damage is limited to a small area, apply a wood filler or epoxy-based repair compound to the affected area. Use a putty knife to spread the filler or compound evenly, feathering it out towards the edges to create a smooth transition. Allow the filler or compound to dry according to the manufacturer's instructions. If necessary, apply multiple coats, allowing each coat to dry before applying the next.