Understanding American Dry Rot Repair
Rot normally starts in wood that is in direct contact with the outside walls, and it may go undetected until it has progressed. It is only possible to determine if the ends of joists in the walls are sound by removing the floorboards alongside an exterior wall. Gutter leaks are also a common cause of decay in the lintels above the windows. American Dry Rot Repair-Dry Rot Repair has some nice tips on this.
Unsound wood is easy to spot because it is normally bent and shows signs of collapsing on its top. After any moisture issues have been resolved and the wood has dried out, the decayed areas shrink significantly more than the sound wood. A sharp pointed instrument, such as a bradawl or a small screwdriver, should be used to prod any suspicious areas of woodwork. If the wood is rotting, the point will easily slip in, while sound woodwork will resist both insertion and removal.
Pick up the floorboard that runs alongside the outside wall and prod the ends of the joists below if you think a floor is decaying. Prod all the way around the ends, paying special attention to where the joists meet the outside wall. The ground-floor joists will often be examined from below in old buildings with cellars.
If large gaps occur between the skirling and the floorboards, rot should be assumed. The appearance of fungal growths on the surface confirms the suspicion. If the blocks on your wood block flooring become loose or curl up at the edges, it may be a sign of decay.
The joints between the lower rails and the upright parts of window frames and external doors are prone to rot. It’s especially common when glazing beads (tiny wood strips that hold the glass in place) have been installed without external putty or when putty has failed.