The Ultimate Chimney Cracks Repair Quiz

By: Staff

4 Min Quiz

Image: refer to hsw

About This Quiz

Masonry and stone chimneys are a common fixture in most homes. Do you know that it is important to inspect chimneys regularly and to repair problems promptly? Give your chimney knowledge a checkup by taking this quiz.

At what age should you expect that a well-constructed chimney would start to experience problems with its mortar joints?

Mortar joints between brick and stone on chimneys are likely to start cracking, flaking or washing out after 20 to 25 years. In rare cases, problems can develop earlier, so it's wise to keep a watchful eye on any chimney.


What is a good way to do a routine check on a chimney to see if it requires a thorough inspection?

The simplest way to check your chimney is by using a good pair of binoculars from the ground. You will need to climb to the roof or hire a professional only if you notice a problem that needs closer inspection.


What is the cause of cracks and flaking of chimney mortar?

Moisture can make its way into the mortar, where it will freeze and thaw in the winter. The freezing and thawing cycles cause mortar to crack and the cracks let in more moisture, which causes chipping and flaking.


What is another common enemy of brick and stone chimneys?

People often attach metal objects such as antennas, satellite dishes and lightning rods to chimneys. Metal expands and contracts at differing rates than mortar, causing extra cracking, and wind loads caused by antennas can place additional stresses for which chimneys were never designed.


What puts chimneys installed in historic homes in greater risk of problems?

Old chimneys were built larger in order to accommodate the heat from hotter fires using coal or wood and deteriorate quickly if they are not heated enough. Retrofitted heating units use gas or oil and run much cooler, so they require smaller chimneys or stainless steel liners.


Why is it important to inspect your chimney regularly if it is 20 or more years old?

Although a major problem with a chimney can be a fire hazard and a leak can allow combustion gases into your home, the real concern is to catch a small problem before it becomes a major repair or a dangerous hazard.


When should you check your chimney immediately even if it is not 20 years old or older?

If you experience a significant earthquake in your neighborhood, you should have your chimney inspected as soon as possible. In 2001, there was a 6.8 earthquake in Seattle and around 50 percent of homes experienced chimney damage.


What is metal or lead sheeting installed around all chimneys called?

All masonry chimneys have lead or metal called flashing around them. One end of the material is imbedded in the masonry a few inches from the roof and the other end is positioned under the roofing to seal out rain and snow.


If you detect what appears to be serious damage to a chimney, should you proceed with your own repair?

If you detect what appears to be serious damage to outer brickwork, flashing or interior lining of the chimney you should stop and consult with a professional. It may even be illegal in your community to do your own repairs.


What is a step you can take to protect your chimney before it has any damage?

One of the simplest steps that you can take to protect your chimney is to install a quality chimney cap. These caps not only help to keep the weather out, they also prevent birds and animals from nesting in or blocking your chimney.


What should you do yearly if you burn wood in a fireplace or stove?

When you burn wood, a byproduct is creosote, which looks like tar so you will need to have your flue cleaned at least once a year. Creosote is highly flammable when it gets hot enough and can cause an extremely dangerous flue fire!


What do you need to do first if you plan to clean your chimney yourself?

If you are not an experienced climber, a safety harness would be a good idea but covering the fireplace opening is essential. It is never a good idea to work on a roof or other high place without a helper on the ground.


Tuck-pointing is a process used to restore mortar where you:

Tuck-pointing is the process of removing flaking, broken and crumbling mortar with a tool called a mortar-raking tool. When done properly you are left with a stable foundation for new mortar.


What should you consider doing when you are only fixing a few areas of defective mortar?

You can mix a pigment with the prepared mortar before making your repairs. Repairs will not stand out from the old mortar joints when you color with pigment.


If you are removing old mortar from between your bricks or stones, how deep should you chisel into the old mortar?

You should always try to chisel to of depth of at least one inch to insure that the new mortar will make a good bond and stay in place. Standard bricks are four inches deep, so you do not need to worry if you go a bit deeper than an inch or two.


What consistency are you aiming for when you mix mortar for your repair?

You are trying to mix mortar that is the consistency of peanut butter, as you want it to stay in place while it dries. Some mortar requires addition of sand while others simply need water.


Where should you start when applying your mortar to the joints?

It is preferable to start with vertical joints before moving on to horizontal joints. Clear away your excess mortar as you go along before it dries on the brick face.


What is a good way to ensure that your repairs last as long as they should?

Try to keep mortar damp for three or four days after you complete your repair to promote curing of the cement in the mortar. Properly cured mortar will ensure that your repair will last much longer.


What should you do if you are noticing dampness around your chimney near the ceiling?

Have your chimney inspected or carefully inspect your chimney for hairline cracks or cracks in the concrete crown. Hairline cracks should be sealed with products designed for that purpose, as mortar is difficult to force into tiny cracks.


Why do experts recommended that you remove vines or ivy from your chimney and brick?

According to masonry experts, you should never allow vines to grow over your brick or stone veneers and chimneys. The root system of creeping vines tends to open up or break down both mortar and brick along with holding destructive moisture that will result in damage and premature failure.


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