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Old 07-12-2012, 07:19 PM   #1
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1930's low pitch roof


I have 2 structures with a 9' space between them that were at some point joined with a 10 degree pitch roof that is approximately 220 SQFT. These are detached garage areas of my home.

Rafters are about 2' apart with 3/4 ship lap board as sheathing. The roof has tar paper and rolled roof. I am having problems with leaks and want to roll new roof material with tar adhesive.

Some of the ship lap is warped, some rotted. I have scrap ship lap that I plan to replace bad areas.

My first question: when I remove old roof roll and paper, after I replace the bad wood should I at the very least, add 11/32" sheathing to ensure a better surface?

Structure 1 has a 30 degree pitch, structure 2 has a 20 degree pitch. Both are staggered 3 tab shingles.

Second question: When I apply the new rolled shingle, is 8" under the staggered shingles enough to protect from leakage?

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Old 07-12-2012, 09:18 PM   #2
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1930's low pitch roof


Post a picture.
Roll roofing is the lowest of the low grade roofing materials, 3 tabs are in second place.
Depending on what the picture looks like there may be better options that would last a lot longer.

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Old 07-13-2012, 03:38 PM   #3
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1930's low pitch roof


Chimney will be removed.
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Old 07-13-2012, 04:28 PM   #4
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1930's low pitch roof


There is no pitching to get water out of that valley. You'll need to provide framing in there to shed that standing water away.
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Old 07-13-2012, 05:06 PM   #5
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1930's low pitch roof


Can you givce us a pic so we can see the whole roof?
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Old 07-13-2012, 05:30 PM   #6
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1930's low pitch roof


I agree with AG 100%. You can get the best roofing material known to man, but the water is still going to puddle up where the 10 degree roof meets the 30 degree roof. You need to build a cricket to divert the water.
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Old 07-13-2012, 05:57 PM   #7
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1930's low pitch roof


Only thing is that one roof isn't very high. Might have to put the cricket in the center going both ways, or maybe better to build it up to a peak instead of the dead valley.

That one vet/chimney looks wonky.
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Old 07-14-2012, 12:33 AM   #8
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1930's low pitch roof


Thanks for all your replies. I will try to post some more photos tomorrow if the weather lets up a bit during the day.

Correct, Mae-ling, the structure on the right has a foundation slab that is about 10" higher than the foundation of the structure on the right.
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Old 07-14-2012, 10:09 AM   #9
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1930's low pitch roof


I've been researching crickets and saddle roofs.

Based on the photos I have attached, what is the least I can get away with by doing the job right? Please bear in mind that since the two structures were built in the '30s, I have no rebar in the concrete slabs and have cracks throughout. The structures should be torn down and rebuilt but I'd rather see them fall down than spend 40k+ to build what I really want.

I was thinking at the very least, after removing the roof, I could start at the center of the left structure with a horizontal, level beam, connecting to the right structure and notching out the v cut for a cricket there.

2x6 for the beams? Then 3/4" particle board and 11/32" sheathing or do I need the 11/32?
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Old 07-14-2012, 11:40 AM   #10
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1930's low pitch roof


Quote:
Originally Posted by AGWhitehouse View Post
There is no pitching to get water out of that valley. You'll need to provide framing in there to shed that standing water away.

Why would you think that roof would leak...

It won't take anywhere near 40K to fix that roof right.
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Old 07-14-2012, 12:17 PM   #11
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1930's low pitch roof


40k to demo structure, repour slab and rebuild...point I was making is that whatever I do, I don't care to invest a tremendous amount of money in something that will last a lifetime when I may demo within the next 15 years.
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Old 07-14-2012, 01:05 PM   #12
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1930's low pitch roof


Pull up roof, create a cricket on either side, slope to the edge on either side.
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Old 07-14-2012, 04:14 PM   #13
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1930's low pitch roof


Cricket from center to both sides is probably the easiest and cheapest.

Is the one roof higher enough than the other on that you could remove the lower one and just slope from the existing higher peak all the way over?

But if ou want cheap and easy the cricket is the way to go.
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Old 07-14-2012, 07:55 PM   #14
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1930's low pitch roof


So as I understand, something like this?

Thanks again for all the help!

http://www.mediafire.com/?n49gwdfxk61hz4c

Last edited by audiohere; 07-14-2012 at 08:19 PM. Reason: missing pic
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Old 07-14-2012, 08:40 PM   #15
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1930's low pitch roof


Like this, start in center and go both ways.


Properly shingle and flash it.

Thinking you should make it level with the top of the lower roof

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