3-Tab Hip Caps Over Arch Shingles: How To Make Lay Flat.

 
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Old 12-23-2017, 09:31 AM   #1
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3-Tab Hip Caps Over Arch Shingles: How To Make Lay Flat.


Hips are more problematic than ridges.

Ridge Caps, you only have to deal steps of 1 to 2 ply and vice versa. No problem.

Hip Caps, you have to deal with the course steps which can be as high as 1 to 4 ply. If you nail in the proper place adjacent to one of these steps, the caps will not lay flat and seal properly.

Is there a customary way of dealing with this?

Thanks in advance,
Tom
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Old 12-23-2017, 12:46 PM   #2
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Re: 3-Tab Hip Caps Over Arch Shingles: How To Make Lay Flat.


Trim the "bottom" off the architectural shingles instead of the top of the last course, so the caps meet the smoother normally covered part of the field shingles...

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Old 12-23-2017, 02:03 PM   #3
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Re: 3-Tab Hip Caps Over Arch Shingles: How To Make Lay Flat.


Thanks for the tip! I know it's hard to put this stuff in words, but I'm not visualizing it...

When you say "top" and "bottom" do you mean the top and bottom ply (lamination?)
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Old 12-23-2017, 02:38 PM   #4
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Re: 3-Tab Hip Caps Over Arch Shingles: How To Make Lay Flat.


I generally hold the shingles back from the peak of the hip, never lapping over it. Sometimes held off 3" or so.


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Old 12-23-2017, 05:38 PM   #5
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Re: 3-Tab Hip Caps Over Arch Shingles: How To Make Lay Flat.


Yes, I'm holding them back from the centerline of he hip - that way you get a larger radius bend on the caps.

Problem is along the sides of the caps and the sealing strip.

One of the approaches I was thinking of was cutting the "points" off the course ends where he cut begins at the cap side.
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Old 12-25-2017, 07:48 AM   #6
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Re: 3-Tab Hip Caps Over Arch Shingles: How To Make Lay Flat.


Im not understanding how you dont know how to make them lay flat but you are installing a roof? I cant even come up with a way to make them NOT lay flat.
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Old 12-25-2017, 08:53 AM   #7
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Re: 3-Tab Hip Caps Over Arch Shingles: How To Make Lay Flat.


Example of not laying flat:

The step from the upper course to he lower course under the cap can be 1, 2, or 3 laminates.

When the step is 3 laminates (4 lams to 1 lam - about 1/4in) and the nail is located adjacent to this step through the single laminate, this creates a 1/4in step in the cap right at the sealing strip.

The next cap will not lay down over a 1/4in step leaving a gap and will not touch the sealing strip.

COMMENT: with 3-tap courses, the upper course to lower course step is always a single lam and the caps lay flat nicely.

NOTE: I've been looking at every arch shingle hip roof I encounter and they all have occasional caps that are not laying down on the sealing strip.

...I should post a pic - there is snow here so no promises...
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Old 12-25-2017, 04:37 PM   #8
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Re: 3-Tab Hip Caps Over Arch Shingles: How To Make Lay Flat.


The laminated shingle I've used are unnotched in the "buried" upper( uphill) part of the shingle....thus "flatter"

On a three tab shingle roof, you'd cut the TOP portion of the last one or sometimes two courses to leave the ridge peak vent open.

To ensure the flat part of the last row of shingle extends low enough that no voids appear under the ridge tabs, trim the lower/ bottoms of the final rows of shingles INSTEAD of the top/higher edge to allow this to occour.
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Old 12-25-2017, 07:20 PM   #9
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Re: 3-Tab Hip Caps Over Arch Shingles: How To Make Lay Flat.


Fourthgeneration,

Thanks for the explanation, however, it sounds like you area discussing ridge caps which are never a problem.

The Problem is with Hip Caps which also go "up" the roof, spanning two courses of shingles. It's the step between courses that is the issue.

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