chimney cap installation

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Old 01-08-02, 11:52 AM
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chimney cap installation

i have a chimney that needs a cap...i bought a cap at lowes that does not require any tools...it fits snuggly against the flue liner (13x13 in)...my problem arose when i journeyed onto the roof and looked at the chimney crown and flue liner...

the flue liner stops about 5 inches from the top of the crown...at the point in the chimney the flue liner stops, mortar starts and continues up to the crown at a slight angle...the crown mortar is cracking and very brittle (about a 30 year old home)...what is a good suggestion for me...

can i just cement a piece of flue liner to extend past the crown 2-3 inches and remove the old brittle mortar on the crown and recemnt????

is that an easy do-it-yourself job, or should a professional chimney repairman tackle that job???

also, what kind of cement is recommended for chimney crowns and at what temperature can it be done...it is about 20 -35 degrees here now...

thanks...michael
 
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Old 01-12-02, 07:42 AM
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Deteriorated chimney crown

Chimney caps are one of the least expensive preventive measures a homeowner can install. A chimney cap protects the chimney from deterioration due to water penetration, prevents birds and animals from entering and nesting in the chimney, and acts as a spark arrestor to prevent sparks from landing on the roof or nearby combustible materials.

Chimney crowns cover the top edge of the chimney from the top of the flue liner to the chimney edge. Most are constructed of common mortar mix, the same mortar used for laying the chimney bricks. This mortar was not designed to withstand years of weather abuse which causes it to crack, chip, and deteriorate. Most sand and mortar mixes actually start cracking immediately due to shrinkage.

A Portland cement mixture is best for forming a chimney crown that extends beyond the edge of the chimney, providing a drip edge that directs water away from the chimney and masonry. There are some waterproof, nonshrinking cement like coatings available for repairing deteriorated chimney crowns.

Repairing chimney crowns and working with cement is a warm weather project. If you use your fireplace, you should have it cleaned and inspected by a licensed chimney professional to determine the extent, if any, of water damage. At this time you can discuss the chimney crown repair and capping as well as the costs. At that time, you can determine whether or not you would like to DIY or hire a professional.

Make sure you get a licensed and certified chimney specialist. The chimney service trade is not regulated and most states don't require licensing. You can contact the Chimney Safety Institute of America (CSIA) at 1-800-536-0118 to see if you have a licensed chimney professional in your area.
 
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Old 01-12-02, 04:41 PM
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thanks

thanks for your advice...i have called a chimney sweep and repairman...he is licensed, bonded, and insured...he is going to take care of my chimney for me...

michael
 
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Old 01-12-02, 05:45 PM
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Chimney cap and crown

Thanks for your response. Now, I won't have to worry about you up on the roof. I need to remove the cap from my chimney at my mountain cabin and clean the vent pipe for my wood burning stove. I'm beginning to get a little worried about swinging my boney legs off the latter and onto the roof. I am not as young and strong as I use to be. Sometimes it's best to call for help.

Best regards to you and your chimney!
 
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