The first sign that your siding needs to be replaced is bubbling or blistered siding. This happens when moisture gets trapped in the wood, causing it to rot. If left untreated, the moisture will continue to worsen and the wood will begin to deteriorate.
Another sign of siding rot is dry rot. Dry rot is caused by fungi that consume the wood in which they live. Dry rot can also cause structural damage if it spreads beyond the surface of the siding.
One last sign that your siding might need to be replaced is loose siding. Loose pieces of wood are often an indication of dry rot or water damage and should be inspected by siding contractors in Mount Prospect before they can fall off and cause further damage.