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Yes, you should seal and cap an unused chimney to protect it from damage. Sealing the structure helps prevent moisture damage, which can lead to issues like cracks, spalling, efflorescence, and damaged mortar joints. Capping the chimney is also crucial to prevent blockages, damage from invasive critters, and downdrafts, while still allowing for proper air ventilation to manage moisture. For the best results, consult a chimney professional to select the right type of chimney or flue cap for your home. It's also wise to continue with annual chimney inspections to maintain the structure's integrity.

There are a few things you can look out for to ensure your chimney is safe to use. Check for the following issues:

• Cracks or missing pieces in the masonry of the chimney

• Creosote buildup in the chimney, which is a black, tar-like substance

• Cracks, stains, or scorch marks in the firebox

• Water stains in or around the fireplace

• A broken or stuck damper

In addition to flashing, a roof cricket can help divert water around your chimney so that it drains properly off your roof. It’s shaped like a double triangle and is installed behind the chimney so that falling water spills evenly down each side. This helps prevent water from accumulating behind your chimney, which can increase water damage and the risk of leaks. 

The International Building Code (IBC) requires cricket installation if a chimney built after 2012 measures over 30 inches in width. Chimneys constructed before that date are typically grandfathered in and aren’t required to have crickets installed.

In most cases, having a fire hydrant installed on your property, whether it’s maintained by you personally or your municipality, will reduce your insurance premiums. Its proximity to any buildings on the property will reduce the time it takes to put out a fire, thus reducing the resulting damage.