Masonry Chimney, What Do you see.

[Milton Tow]

Bob and Marcel

Thanks for your input.

· The cap is flat poured in place, with 2 water pooling areas due to an incorrect, non slope to accommodate water runoff, and a non conforming 2” overhang to include a drip curf and no expansion joint and proper sealant detail at flue liner and poured cap. All leading to premature failure and water intrusion.
· Many mortar joints within the 3 courses of brick just below the replacement areas above having numerous issues, should have been included in rebuild. Now leaving the upper work subject to poor support due to the bad mortar joints, not to mention water entry points. All leading to premature failure and water intrusion.
· Inconsistent sized mortar joints and many exceeding the maximum recommended size of 3/8” . Having noted the different sizing in the brick widths 8” original to 7-1/2” rebuild, resulting in different course appearances the upper rows now include a odd sized spacer brick in each course. Result in premature mortar failure and water intrusion as a result.
· As for the rusty tape , just can’t toss it yet.

[Milton Tow]

Is ther any comment on the use of the under sized brick and irregular and over sized mortar joints?

[Marcel R. Cyr]

Do you have a picture of the chimney so we can help on that question?
Hard to see when we only see the top of the cap. Looked like a mortar wash to me the way it was sloppy.
Some type of bricks come in both 7-3/4" and 8", and mixing them up in a running bond that is only 30+/-" is not conducive to a good job outcome.

[Christopher Currins]

Originally Posted by mcyr

Do you have a picture of the chimney so we can help on that question?

There's more here.

http://www.nachi.org/forum/f21/mason...you-see-65874/

[Marcel R. Cyr]

Here is a cross section that pretty much shows all talked about.




&lt/body&gt

And you can check out this CAD drawing of a typical chimney cap here;
http://www.aecinfo.com/1/resourcefil...lt69523_1.html



Chimney caps not properly done will look like this or cause this.

[ATTACH][/ATTACH]

[Milton Tow]

[KEVIN WOOD]

Hello HI:

I have the WETT manual and I looked on pg 14 under chapter 4 on Chimneys. I also looked at the B365 under installation and Masonry and concrete chimneys under 9.21.4.6 division B and I still can't find it called a 'Drip Check"

[Marcel R. Cyr]

It's called a drip period. Any other term might be just a geographical thingy.

http://www.maconline.org/tech/design.../chimneyd.html

[KEVIN WOOD]

That is what I found also Marcel! I want to know where he found "Drip Check" I would like it for my reference in case I here it again.
masonry-chimney-do-you-see-negative_cap-small-.jpg .... The element labeled " capillary break" is actually known a "drip" or "drip check".

[Leonard Inkster]

Originally Posted by mtow1

6th picture.

You need a longer tape measure, this one doesn't go all the way to the other side of the Chimney, plus, next time, try to get one with graduations on so you can see how long distances are.

[Leonard Inkster]

The brick sizes shouldn't matter as long as they are all in the same course. The over-size mortar joints might be hiding bonding pegs, so although you could draw attention to it, it is not necessarily a defect.