CALL OR EMAIL US TODAY FOR YOUR FREE ESTIMATE – 202-276-5004 FAMILY.ROOFING@YAHOO.COM
A TRUSTED NAME IN WASHINGTON, DC FOR THREE GENERATIONS! EXPERTS IN SLATE * METAL * RUBBER * SHINGLE * GUTTER & DOWNSPOUTS
Big enough to serve you, small enough to know you
Six Reasons for Chimney Leaks and What to Do About Them
Causes of leaking chimneys can usually be narrowed down to six reasons. If your problem isn’t solved from addressing the items on this list, your leak probably isn’t from the chimney!
#1 The Simplest Cause of Chimney Leaking: Rain Going Straight In from the Top
It’s not hard to picture that. Chimneys without covers get a lot of rain falling straight down into them. A chimney cover makes sense to most people. Not only does it keep the rain out, but keeps birds, animals and debris out. The greatest value of the chimney cover is really keeping these out because when chimneys get blocked at the bottom, people get sick (or even die) from CO poisoning. While it’s true that sometimes an uncovered flue is the source of water problems, most often this reason for a leak is only when the liner is metal.
How to fix it: Have a Pro install a chimney cover.
#2 Many Chimney Leaks are from Cracks in the Chimney Crown
The chimney crown is the cement part on top of the chimney. The bricks go up around the tile flue liners, but at the top you need something to stop the rain and snow from just falling in around the tiles. You can see that the very purpose of the chimney crown is to keep rain out. Cracks in the chimney crown can occur from shifting of the structure or from shrinkage dating back to the first day the crown was put on. When your crown has cracks, the water goes right through those cracks.
How to fix it: How to fix a cracked crown depends upon how bad the damage is. Most crowns have small cracks. Even small ones need to be fixed because all big cracks started out as small ones. Water freezes and thaws in the cracks all winter long, year after year, forcing small cracks to eventually become big cracks. There are excellent crown coating materials which cover the masonry and prevent small cracks from becoming a real problem. Once chimney crown damage is significant, the only fix it is to remove and relay the masonry. You can’t put a band aid on a gushing wound and you can’t coat a structurally ruined chimney crown and expect it to work. Best to coat your crown now and avoid the big hassle and expense later.
#3 Chimneys Leaking From the Inside Out from Condensation
How to fix it: Gas fumes are very low temperature and have a lot of moisture in them. These fumes were condensing on the inside of this too-large, too-cold old chimney, literally soaking the bricks and keeping them moist all the time. All it took was a chimney liner and we solved the problem.
#4 Chimney Flashing Causes Leaks
The flashing is what keeps water from going into the place where the brick structure comes through the roof (or otherwise comes close to the roof.) There’s a fairly large gap between the bricks and the roof and water will pour through that hole if it’s not sealed up. Flashing is often aluminum that goes in between a couple bricks and bends to go on top of the shingles. Some sort of waterproofing seals those spots. Though it’s far from the best choice, this is often tar. In any event, flashing doesn’t last forever and the tar lasts even less time.
How to fix it: There are better materials for sealing the flashing now.
#5 Chimney Leaks Caused by Leaking Bricks
Bricks and mortar both pass water, and often lots of it. The problem here is the same as with the crown- the freezing and thawing all winter long with the resulting damage which causes leaks in the house. You have probably heard of waterproofing a chimney, but you have to be careful about what waterproofing material to use. When water is absorbed into a brick or a mortar joint in the summer time, the water probably dries out after a while. The exceptions might be for a surface in the shade or on the side of the house where the sun never shines; those walls just stay wet. That water does try to escape by “falling” i.e. the water weight carries it toward the ground where it forces its way out of the bricks either inside or outside of the house.
If you apply a waterproofing material that physically blocks the pores of the brick or mortar, the water is trapped inside the brick. Some bricks actually get soggy, though it’s more likely that the water will just seep to the inside of the house. To the point, using silicone based water sealants may trap water and cause more damage than you started with.
How to fix it: To find out if your chimney leaks through the masonry surface, have your sweep do a Masonry Absorption Test (MAT). This is a simple test where a special test tube is attached to the side of the chimney and you record the time it takes for water to be absorbed into the wall. This tells you if you should waterproof the chimney.
#6 Chimney Leaks That Aren’t Chimney Leaks
Sometimes, a leak starts in a different place but finds its way to the chimney, and then visibly enters the inside of a room at the point of the chimney. For example, your roof might have a leak through the attic vent or roof shingle at the top. Water could get into the attic or above your ceiling and either drip to the floor or roll along the stringer (the long piece of wood that spaces out the roof trusses and runs the length of your house). If the stringer is un-level, water can travel a ways – and even wind up at the chimney. It has happened, and usually isn’t discovered until people have spent a terrible sum fixing everything else.
nother event that could happen is that you could get so much moisture in your attic that it could condense and roll down the stringer onto your chimney. This could happen if there were some reason your attic was getting a lot of humidity in it – for example, if your dryer vented into the attic instead of out of a vent perhaps, or if your gas furnace were vented by B Vent but just dumped into the attic (which would be a severe carbon monoxide risk, incidentally).
