How often should your chimney be sealed?

Find out how much it costs to waterproof your chimney.

Masters Services Certified Chimney Professional recommends that every masonry chimney is waterproofed. Every chimney eventually leaking, so stop it before it becomes an issue. The average cost is $150 to $250.

You may also be curious about the cost of sealing a fireplace. A chimney repair costs on average between $300-$4000. Repair costs vary depending on the extent of damage, the materials used (e.g. flashing, bricks, etc.), the condition of the chimney crown and the location of your chimney.

Do brick chimneys have to be sealed?

Water repellents such as ChimneyRx Masonry Chimney Water Repellent do the opposite. They will let the surface breathe and keep water out. It is important to not use a sealer when treating chimneys. If enough bricks have been broken, you will need to replace them or rebuild the chimney.

How can you seal an old brick chimney with mortar?

Seal the chimney bricks. Work your way to the top. Use the same technique to apply a second coat in five minutes. When the crown sealer is dry to touch (30-60 minutes), take off the duct tape, but keep the roof tarps. Before applying the water repellent, mask any chimney flashings that have been painted.