Milwaukee Chimney Repair

Nice article about chimney Damage causes for my Milwaukee Chimney Repair customers. 

The fact that chimneys may do their job reasonably well, even when abused or neglected, contributes to this atmosphere of indifference. Chimneys are far from the passive black holes that most people assume them to be. They perform several vital functions, and their simple appearance misrepresents their complex construction and performance requirements. A chimney deteriorated by constant exposure to the weather can be a potential safety hazard. Weather-damaged lining systems, flue obstructions and loose masonry materials all present a threat to residents. Regular chimney maintenance is essential to prevent damage, deterioration and future high-cost chimney repairs.

Masonry Chimneys
A masonry chimney is constructed of a variety of masonry and metal materials, including brick, mortar, concrete, concrete block, stone, flue tile, steel and cast iron. All masonry chimneys contain combinations of, or possibly all of, these materials, most of which are adversely affected by direct contact with water or water penetration.

Water Penetration
All masonry chimney construction materials, except stone, will suffer accelerated deterioration as a result of prolonged contact with water. Masonry materials deteriorate quickly when exposed to the freeze/thaw process, in which moisture that has penetrated the materials periodically freezes and expands causing undue stress. Water in the chimney also causes rust in steel and cast iron, weakening or destroying the metal parts.

Note: While most stone is not affected by water penetration, large amounts of mortar are required to bond the stone together properly. Therefore, a stone chimney – just like a brick chimney – should be protected from the effects of water penetration.

Water penetration can cause interior and exterior damage to your home and masonry chimney including:

• Rusted damper assemblies

• Deteriorated metal or masonry firebox assemblies

• Rusted fireplace accessories and glass doors

• Rotting adjacent wood and ruined wall coverings

• Water stained walls and ceiling

• Clogged clean out area

• Deteriorated central heating system

• Stained chimney exterior

• Decayed exterior mortar

• Cracked or deteriorated flue lining system

• Collapsed hearth support

• Tilted or collapsed chimney structure

• Chimney settlement

In addition, when water mixes with creosote in a wood burning chimney system, it will generate a highly disagreeable odor that can permeate a home.

Preventing Water Damage
Chimney caps, also called rain covers, are probably the most inexpensive preventive measure that a homeowner can employ to prevent water penetration and damage to the chimney. Chimney caps have long been recognized as an important chimney safety and damage prevention component. Underwriters Laboratories (UL) specifies that any chimney lining system that is to be listed to their test standard must include a chimney cap.

Chimneys have one or more large openings (flues) at the top that can collect rainwater and funnel it directly to the chimney interior. A commonly-sized flue has the potential to allow large amounts of rain or snow into the chimney during just one winter when freeze/thaw cycles are common.

Chimney caps also provide other benefits. A strong, well-designed cap will prevent birds and animals from entering and nesting in the chimney. Caps also function as spark arrestors, preventing sparks from landing on the roof or other nearby combustible material.

A chimney cap should be easily removable to facilitate inspection and cleaning. For a long and effective service lifetime, a cap should be constructed of sturdy, durable and corrosion resistant material. Caps may be designed to cover a single flue, multiple flues, a large portion of the chimney or the entire chimney top. A full coverage chimney cap usually represents a larger initial investment. However, it is probably the best investment for long-term protection because of its ability to protect the entire chimney crown.

Repair or Replace a Damaged Chimney Crown
The chimney crown (also referred to as the chimney wash) is the top element of a masonry chimney. It covers and seals the top of the chimney from the flue liner to the chimney edge. The crown should provide a downward slope that will direct the water from the flue to the edge of the crown. The overhanging drip edge, by directing the run-off from the crown away from the chimney, helps prevent erosion of the brick and mortar in the chimney’s vertical surfaces.

Most masonry chimneys are built with an inadequate crown constructed from common mortar mix that is designed for years of weather abuse without cracking, chipping or deteriorating. A proper chimney crown should be constructed of a Portland cement-based mixture and cast or formed so it provides an overhang projecting beyond all sides of the chimney by a minimum of two inches. The flue liner tile should also project above the crown a minimum of two inches.

Repair Deteriorated Mortar Joints
Deteriorated mortar joints on the chimneys exterior are entry spots for water. Proper mortar joints have no gaps or missing mortar and are shaped in a way that directs water out of the joint. When mortar deteriorates from exposure to weather, it becomes much more absorbent. A common repair for deteriorated mortar joints is called repointing. In this process, the existing mortar joint is cut to an appropriate depth and the joint is repacked with new mortar. The joint is then cut to form a concave surface that will direct water out of the joint. A good repointing job, using proper materials, will give the chimney a much longer life span, and often will enhance its appearance.

Repair or Replace Flashing
Flashing is the seal between the roofing material and the chimney. Flashing prevents rainwater or snow melt from running down the chimney into living spaces where it can damage ceilings and walls and cause rot in rafters. The flashing is the expansion joint between two dissimilar materials. It is designed to allow both the roof and the chimney to expand and contract at their own rates without breaking the waterproof seal in either area.

Install a Cricket to Stop or Prevent Leaks
If the chimney is located on the low side of the roof where water run-off is directed against the chimney, the installation of a cricket will afford additional protection against water leaking into the home. A cricket is a water deflector that serves to direct rainwater away from the chimney. Crickets are recommended on chimneys more than 30-inches wide and they are especially important on steep roofs.

Waterproof Your Chimney
Most masonry materials are porous and will absorb large amounts of water. Common brick is like a sponge, absorbing water and wicking moisture to the chimney interior. Defective mortar joints or the use of improper mortar or brick can greatly increase the tendency to absorb and convey water to the interior of the masonry chimney.

Several products have been developed specifically for use as waterproofing agents on masonry chimneys. These formulas are 100% vapor permeable, which means that they allow the chimney to breathe. Therefore, water that has penetrated and the vapors produced when the chimney dries out or the water vapors produced during use are allowed to escape, while the waterproofing agent prevents water from entering from the outside. These products usually have a five- to ten-year warranty. Paint or clear sealers should never be used as a waterproofing agent because they will trap water vapors and moisture inside the chimney causing further deterioration.

Waterproofing is a preventive measure. When damage or deterioration (gaps, voids, cracks, missing mortar, etc.) already exists in a masonry structure, the chimney should be repaired before the waterproofing agent is applied. The chimney exterior may also need to be cleaned before the waterproofing material is applied.

- See more at: http://www.csia.org/homeowner-resources/water_and_your_masonry_chimney.aspx#sthash.uI451wAZ.dpuf

Clean Sweep Chimney Service is located in Southeastern Wisconsin and services Milwaukee, Waukesha, Slinger, and the entire Southeastern Wisconsin area. If you need Chimney repair or Chimney Cleaning Call us at (414) 483-9996. Our Website is at http://cleansweepchimney.vpweb.com

Milwaukee Chimney Repairs

Many Milwaukee homeowners are under the impression a simple chimney sweep is all they need to get their fireplace up and running.  Yes, your certified chimney sweep should be performing a detailed inspection of all the vital components of the fireplace interior and make chimney repair recommendations to the exterior.  What if you are the homeowner who doesn’t use their fireplace? Or maybe you have switched to a gas insert so you no longer require and annual chimney sweep, how do you know if you need chimney repair.   Here are 5 things you can check on your own to determine the state of your masonry chimney condition and structure.

1. Check for a Chimney Cap

You don’t even need a ladder for this one, step outside and take a look. The chimney cap’s #1 purpose is keeping rain out of the chimney flue. Yes, it is not a masonry portion of your chimney, but its presence is vital to the survival of your chimney’s interior and exterior.  In 95% of cases needing chimney repair that I find in the Seattle and Bellevue
area, a chimney cap is not present.  Why is this a problem?  Water.  We all know water is the #1 source of deterioration of all home components, rot, mold, mildew, moss, freeze-thaw, etc, etc. Water in your chimney, or in your masonry is always bad news.  If your chimney does not have a chimney cap, its time for a chimney inspection, possibly some repair, and most definitely time to install a chimney cap.

2. Is your Chimney Crown in Good Condition?

The chimney crown is the chimney’s second line of defense against… you guessed it, water.  The crown is the 2″-3″ concrete or mortar slab that has been poured on the very top of the chimney. This covers the top course of bricks of your chimney and surrounds the top flue tiles of each appliance.  Why is this needed? Besides for the aesthetic appeal, chimneys are constructed with a hollow interior surrounding the flue tiles.  This hollow space around your fireplace, and flue liners is very important (but will be left for another blog post). Other than covering the hollow opening of the chimney the brick also much be covered. Most bricks have a somewhat water resistant facing on their front and sides, however, on the top and bottom they are extremely porous. This is vital during brick construction so the mortar can achieve the best bond to the brick top and bottom as possible.  However, when left exposed to the weather the brick becomes saturated with moisture and is exposed to freeze-thaw, moss and mildew.  Wet bricks and mortar joints =  deterioration.  Check your chimney crown for proper construction, proper thickness, cracks or receding edges or corners.  Just like chimney caps, when a chimney has an improper or damaged crown 95% of the time there is deterioration to the chimney structure, and you will need a chimney repair.

3. Do you need Chimney Tuckpointing?

Chimney tuckpointing is commonly misused to describe “mortar joints”. “Tuckpointing” is actually a verb and describes the process of repairing mortar joints, this is a common chimney repair service and usually needs to be done on all chimney masonry every 30-50 years.  So how do we know when we need our mortar repaired?  Well, since chimneys are half above the roof and half below the roof, they always deteriorate at different rates. Above the roof the chimney is exposed to harsher weather conditions, colder temperatures, wind, rain, ice, snow.  Below the roof the chimney is much more protected. Not to mention if the chimney is missing a cap or has a damaged crown, the damage will start at the top and slowly progress downward.  Check your mortar joints above the roofline first.  Check for cracks, separations between the mortar and the brick, and finally take a screwdriver and scrape the mortar to see if it is soft or begins to flake a fall away.  Good mortar will barely leave a mark when running your screwdriver across it. Bad mortar will fall away and leave a gouge.  Make your way down the chimney below the roofline and check the mortar there as well.  Any areas where the mortar is soft should be repaired. Chimney tuckpointing can only be done to partially damaged mortar however.  If the mortar joint is left unchecked for long enough it will fail completely through the joint and the bricks will be loose.  Once your bricks are loose, they have to be rebuilt.  Take a hammer or the palm of your hand and tap on some bricks near the top, moving down.  If any of the bricks are loose, those will need to be torn down and re-mortared.

4. Do you have Efflorescence or White Staining?

White discoloration on a chimney is a sure sign of a moisture problem and a good indicator of some possible chimney repair.  This is called efflorescence, it is the natural salts in the brick and mortar that are brought to the surface by moisture and then left behind when the moisture evaporates.  This can be removed easily with warm soapy water, however, this w0n’t solve the problem.  The most common causes of this is a missing chimney cap, a damaged or missing crown, and/or damaged mortar joints.  Let your chimney repair technician know where you are noticing the white staining on your chimney for a more accurate diagnosis.

5. Is There Firebox Damage?

Are there missing mortar joints in your fireplace bricks? Are the bricks loose? or covered in white efflorescence?  These are very common signs of once again, water leaks into the chimney. Your fireplace firebox is constructed of a very fragile type of brick called firebrick. This type of bricks is designed to be porous to provide adequate insulation to prevent heat transfer.  It also is not constructed with just plain old mortar. It requires a special refractory cement to hold the bricks together throughout the high temperatures of your open fire.  This refractory cement however, is water soluble. When these firebox mortar joints get wet, they turn to powder and fall apart.  Loose bricks, missing mortar joints and crumbling firebrick are all sure signs that chimney repair is in your near future.

Clean Sweep Chimney Service is located in Southeastern Wisconsin and services Milwaukee, Waukesha, Slinger, and the entire Southeastern Wisconsin area. If you need Chimney repair or Chimney Cleaning Call us at (414) 483-9996. Our Website is at http://cleansweepchimney.vpweb.com