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Old 08-21-2009, 11:52 AM   #1
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shingles next to chimney box???


Hey everyone,
I plan to shingle my roof in a couple weeks. It's a simple hip roof with a slight pitch.

Only part that has me scratching my head is my chimey box sitting on the roof. The box appears to be a 2x4 frame fastened to the roof with T-111 siding on it. The siding in the back is rotted out which I need to replace. What kind of flashing should I put around this box?

Thanks,

deck99

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Old 08-21-2009, 12:31 PM   #2
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shingles next to chimney box???


Hi,

What is wrong with the flashing design that is there now?

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Old 08-21-2009, 12:57 PM   #3
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shingles next to chimney box???


I know that the siding in the back is rotten. I plan to replace the siding. I can't really tell what the flashing is around the sided box.

I thought if I tear the siding off I might be able to put some type of flashing arond the 2x4 frame and then put the new siding back over it. Then Maybe leave the siding up off the roof an inch or so and put a tar bead to seal the shingles????

Not sure what how the common way to do this.

Thanks,

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Old 08-21-2009, 01:06 PM   #4
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shingles next to chimney box???


Hi,

The flashing design that is there now must work. So why change the design.

Keeping the siding up off the roof is a good idea. Also painting or stain the siding more often will help.
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Old 08-21-2009, 01:06 PM   #5
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shingles next to chimney box???


If you can post a pic that will help the guys that know roofing assist you
There are many ways to box & flash a chimney based on design & relationship of chimney to roof/house
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Old 08-21-2009, 01:50 PM   #6
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shingles next to chimney box???


The unit that you are describing is called a Chimney Chase.

It is hollow on the inside except for the pipe(s) that run through to the top sheet metal cap.

Your bottom wood is "Probably" rotting due to being installed too close to the roof surface and allowed water run-off to wick into the organic fibers of the boards.

When rebuilding it, allow about 1/2" to 1" of a space from the top of the shingle surface to the bottom of the wood trim.

If it is wider that 3 feet, you should consider building a saddle on the high side where the water flowage runs into to shed the water to both sides of the unit.

The existing step flashings and bottom apron flashing and the top pan flashing are probably in good shape metal wise, but you may need to inspect for how close the old nail holes were when the shingles installed previously punctured it. If too close to the units side edges, then either replace or encapsulate the sheet metal with Grace Ice and Water Shield.

Ed
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Old 08-21-2009, 10:08 PM   #7
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shingles next to chimney box???


Ed,
Thanks for your comments. Yes I believe the T-111 siding on the outside of the chimney box is too close to the roof surface. It almost looks like the shingles butt up against it. It's hard to tell because thre is so much tar around the bottom. I Plan to pull the siding off the frame and replace. I am hoping the fram is not rotten.

I discovered the chimney flashing kits at menards. I think that is the approach I will take.

Wish me luck.

deck99

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