What Does The Inside Of A Chimney Look Like?
A safe, healthy flue carries (or vents) the byproducts of fuel burning including carbon monoxide safely to the exterior of the home.An unsafe, unhealthy flue can allow these byproducts into the home. Creosote buildup within the flue can also provide the hazard of fire.
Flue B, which services the furnace of the home, shows how moisture can leach into the home, causing wall damage, as well as cracked and missing tiles, leaving the possibility of carbon monoxide leakage into the home.
Install a Chimney Cap
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. Chimneys have one or more large openings (flues) at the top that collect rain water and funnel it directly to the chimney interior. A strong, well designed cap not only keeps this water out, but will also 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.
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 liners to the chimney edge. Most masonry chimneys are built with an inadequate crown constructed from common mortar mix, the same mixture used to lay the bricks of the chimney. This mortar is not designed for and will not withstand years of weather abuse without cracking, chipping or deteriorating; situations that allow water to penetrate the chimney. In fact, most sand and mortar crowns crack almost immediately after installation because of shrinkage.
A proper chimney crown should be constructed of a portland cement based mixture and cast or formed so it provides an overhang, or drip edge, projecting beyond all sides of the chimney by a minimum of two inches. This drip edge directs the runoff from the crown away from the sides of the chimney, helping prevent erosion of the brick and mortar in the chimney's vertical surfaces.
There are also some modern waterproof, non-shrinking, cement like coatings for repairing damaged mortar crowns that seem to work fine.
Repair or Replace Flashing
Flashing is the seal between the roofing material and the chimney. Flashing prevents rain water from running down the chimney into living spaces where it can damage ceilings or walls, or cause rot in rafters, joists, or other structural elements. The most effective flashing is made up of two elements, the flashing and the counter- flashing.
The base flashing is an L shaped piece of metal extending up the chimney side and under the roofing shingles. The counter flashing, which overlaps the base flashing, is imbedded and sealed in the chimney's masonry joints. This two element flashing allows both the roof and the chimney to expand or contract at their own rates without breaking the waterproof seal in either area.
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 structure.
Several products have been developed specifically for use as waterproofing agents on masonry chimneys. These formulas are vapor permeable which means that they allow the chimney to breathe out, but not in. Thus water that has penetrated the chimney, or moisture that has originated from inside, is allowed to escape, while the waterproofing agent prevents water from entering from the outside.
Paint, or any non vapor permeable water sealer, should never be used as a waterproofing agent because it will trap moisture inside the chimney, accelerating deterioration.
Water damage to masonry chimneys is usually a slow, subtle process. The problem is often not evident until it has become quite serious.
Although these water prevention measures may cost a few dollars initially, they will save you the major expense of large masonry repairs or rebuilding of the entire chimney in the not too distant future, and as such represent a wise investment in your home.
Municipal installation codes now require that a properly sized, stainless-steel chimney liner be installed from the insert flue collar to the top of the chimney. The result is better performance and a safer system.
All chimneys are different. A site inspection is need. We come and inspect your chimney and provide you with recommendations that will suit your needs and budget.
Check your local area for code and safety requirements.
The Job of a Chimney
The most important part of your home, next to your roof.