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I am renovating an old stone barn that has a low pitched almost flat roof, corrugated metal with 2x4s holding it up.
I am adding on a second story made out of structural steel (probably overkill but I had the metal around), and the roof will be a steep sloped hay-barn style. I want to reuse the corrugated metal and 2x4s if I can. I am on a budget, but want to make sure the roof will not leak, and provide reasonable insulation from the Texas heat. I may have a workshop and office in the barn someday (with heat and AC).
I have thought about using some combination of corrugated metal, 2x4s, Styrofoam sheathing, OSB and felt. Not really sure where to leave air, and what assembly sequence to use. I live in an unincorporated area and do not have any codes to be concerned with; anything I do will be an improvement (although it does not currently leak).
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I am in the business of promoting new roofing however it is nice to hear the stories of reuse in metal roofing.
It sounds like you will eventually end up with a vaulted ceiling. You need to watch as the new roof purlins will need to be in line with the old so that the same fastener holes can be used. While you claim you are not subjected to a building code the ventilation requirement is there finally for a good reason which you mention, to reduce heat transfer and energy costs.
For the interim, I would recommend installing a foil faced reflective underlayment that has excellant energy properties for the thickness (1/4") and doubles as an underlayment. It works best when the roof covering is space 1" away and this meets code. After you instal the new purlins, install the reflective barrier and then strap the roof over the purlins with 1" minimum boards. Fit vented closure strip at the eaves under the metal and at the ridge under the capping.
8/26/2004
Or copy this URL: https://www.metalroofing.com/spirit/comment/3874/find/Dura-Loc Roofing Systems, Inc.
8/27/2004
Or copy this URL: https://www.metalroofing.com/spirit/comment/3875/find/