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Jim S. made an interesting observation about the curling appearing to be the worst on the lower half of the slope, and the ventiliation problem likely being a concurrent causation with the defective shingles.  I see the vents along the ridge which appear to be fairly far apart, but it is a little hard to judge distance unless I strain real hard & count those tabs!!

One thing I've noticed is that those modular/double-wide mfr's often neglect to install the proper amount (if any at all) of soffit vents or the gable end vents to accomodate true full ventilation.  The end result is what you see here, and what you also find in the winter time with ice dams in the gutters or the rake in the absence of gutters.  Do you recall if this house had any soffit vents?  

By the way, please send some of that searing Nebraska heat back home that you referred to.  We've been a little short on spring & heat here of late.  No shortage of rain though.   

Just another note regarding Leland's excellent comparison of organic vs. fiberglass.  I always noticed that the organic shingles tended to "crumble" on the edges much easier when you were walking a roof during an inspection.  An older organic shingle surface generally shows more edge damage after a minor/moderate hail storm, compared to the fiberglass, even though neither product may exhibit any penetrations or hits on the main surfaces of the tabs.  Makes for interesting adjusting when you have a mix in the same neighborhood.....totals vs. no-damager's. 

What is "blue ice"?

They look like organic shingles.  They tend to swell and slough granulate when damaged.

This has been a good learning topic for some of the new adjusters. Photos do tell a lot. Also adjusters who want their files to sail through take very good photos. Always try to get 2 sides on the front and rear elevation photos.Always take a long shot of the longest ridge from one end to the other. When you take a close up, always have the long shot before the close up. When taking a close up of any mark on a shingle place a dime or quarter on the close up and it will define what you are trying to show the file adjuster.

On a topic that will be used this season. All the inside adjuster needs are good photos and accurate measurements. I saw a post on CADDO for estimaters(on a software program) and report writers. Now with the persons who have posted on this topic sitting in an office in their home the loss can be settled . The inspector would also give notes to the inside about wet/warped lumber. Moisture/wicking/smell etc.

The inside(scoper) would send it to estimatics and the report writer and the completed file reviewed and submitted. A small operator would do the estimatics and report himself. ...... hmm..... sounds like FICUS TREE.

The shingles are more than likely organic like many others have mentioned. A couple years ago all the shingle manufacturers dropped the organic asphalt line in favor of fiberglass asphalt. At one time it was said that 3 squares of fiberglass shingles could be made in the amount of time it took to produce 1 square of organic shingles. Organic shingles weigh more than fiberglass shingles. In Xactimate the heavy weight three tab line items would reffer to the organic shingles.

Certainteed Sealdon 25's were one of the most popular shingles installed in MN in the 90's. Others are Horizon, Hearthstead, Hallmark, and Independance. The Sealdons, Horizons, and Hearthsteads are no longer made. So far working claims with these shingles with even minumal wind damage the insurance companies pay for full replacement.

If I was a gabling man I would bet that those shingles in the pics are Certainteed Sealdon 25 Weather Wood. I have torn off roofs 3-5 years old with those shingles while others last up to 20 years. Corner curling is one sign of an organic shingle another is blisters. Cracking is a sign of a fiberglass shingle.

I have never seen an organic shingle thermal crack like fiberglass shingles.

It is definitely an organic shingle, which seems to be older than the 6 year reported date since installation.

The organic shingles from Globe manufacturing and also Tamko were very poor quality to begin with.

A manufactured home typically also has vaulted/cathedral ceilings within, which do not allow for proper air flowage, ie; from the continuous intake ventilation under the soffit to the exhausts vents.

Obviously, there is no continuous ridge ventilation and from what I typically observe on manufactured homes, there also is not continuous soffit fresh air intake ventilation.

The insulation in the ceiling cavities, or individual rafter bays would stifle the proper air flowage regardless though, unless the amount and thikness were substantially diminutive and also if it has settled, to allow a minimum of a 1 1/2" to 2" space for free flowage of ait.

The damaged shingles in the valley photo are typical of one bad bundle, sometimes a much poorer quality run of the shingles than the other bundles, for multiple possible reasons.

I did not see any evidence of recent hail damage, but more properly viewed blistering of the shingles causing premature detachment of the protective granule surfacing.

Ed