EFFECTIVE 14 Nov. 2012 PRIVATE MESSAGING HAS BEEN RE-ENABLED. IF YOU RECEIVE A SUSPICIOUS DO NOT CLICK ON ANY LINKS AND PLEASE REPORT TO THE ADMINISTRATOR FOR FURTHER INVESTIGATION.
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IMH (and terribly neophyte)O, I think you might need to talk to a person who has worked on restoring buildings on how to solve a problem like that in your Wright building, or get in insulation/roof venting, without altering the roof/lines of the building.
We had very bad ice dams a few years ago in this area, and, as a temporary fixative, friends went out an bought ice rakes to keep the ice from forming on the roofs. Ice damming, as I recall, was happening because snow was melting, then freezing before it got to the end of the roof, causing ice build-up.
I hope this helps.
The unfortunate part (or fortunate, depending on your perspective) is that you own, what I am assuming is, an original FLW and nothing is typical or common in this case. In addition, I probably wouldn't recommend cutting holes and installing potentially disgraceful ventilation systems in a FLW. In this case, as others have mentioned, low-voltage heating coils may alleviate the ice damming issue, but be aware you are not actually addressing the likely source of the problem -- improper ventilation. It is possible that this could lead to additional problems for your residence.
In addition, where you have mentioned you experienced leaks inside the residence, you may want to investigate if any damage has occured to the wall system. Problems could occur with saturation of the insulation and wall surfaces which could cause paint to bubble and drywall to expand, rotting of the wall framing in extreme cases and can create a breeding ground for mold (one of the "hottest up-and-coming" lawsuits in the building industry these days!) Leaks from ice damming may also suggest that there is damage to the very membranes that are intended to halt the infiltration of water. A review of your roof shingles, waterproofing membranes, if applicable, and the roofing substrates is recommended to find all sources of damage. Look also in your attic to see the extent of water infiltration -- there could potentially be more leaks that you are not aware of.
If you suspect that your ice damming problems are minor in nature, a consultation with nearly any reputable contractor or handyman should be sufficient. If you suspect this is a larger problem, or if you wish to have somebody more familiar in the "ways of Wright" to address this, you may be better to speak with an architect. With all the published information on many of Wright's buildings, an architect could likely find the original detailing of your particular residence and study them to better determine the exact cause of your problems and any areas for correction.
Some of the items I have mentioned are serious in nature, but I do not intend to cause panic for in most cases ice daming is a small issue. Many of these problems and solutions I have suggested may not apply. If the leaks and ice daming have been around for a long time (and potentially so since your residence is likely pre-1959), some of the problems identified may, in fact, apply. I only hope to educate and point you in the right direction.