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TOPIC: Standing Seam roof

standing seam over shingles

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Hi, I am researching a new roof for my house. Currently I have a 15 year old 3-tab asphalt shingles (not archtectual). The roof is in o.k. condition but starting to show wear on the gravel. Can you apply standing seam directly on top of the old shingles? Would you put something like a new layer of tar paper or rosin paper between it? The attic is ventilated. I am also considering the 3' rib type panels as well and saw that most recomendations for it is on top of some type of battens. I am looking into this as a DIY project. Thanks
Guest User

6/19/2006
You would definitely want an underlayment and a slip sheet (such as red rosin paper) over the shingles, or use one of the new polymer underlayments which serves as both. Actually, for residential applications, I am not sure you will always finds the recommendation for battens. In any event, find a product you like and then be sure to install it according to manufacturer specifications. Todd Miller
Todd Miller
Isaiah Industries, Inc.

6/19/2006
Thanks for the reply. So far I have not contacted any mfg. I have just been doing research on different materials and styles. I thought the use of battens might decrease the heat load to the roof by keeping an air space between the metal and old roof if I used some type of ventilation strips at the peak and eaves. My house is convential style construction with 8' interior ceilings and a vented attic with continous vented soffit and some roof vents. If I use metal I was thinking of opening the ridge by cutting out about a 4" strip of the plywood on each side of the peak and using a product like cor-a-vent in conjuction with the ridge cap to eliminate the existing roof vents. Then if I used the battens I would be adding more of the vent material at the eave and peak to ventilate that space as well.This would be with using a ribbed panel. I dont think the standing seam would work well on top of battens because it doesnt seem like there is enough rigidity to keep the panels flat. I think they would dip between the batens.
Guest User

6/20/2006
Certainly time to contact a manufacturer and get their recommendations. Equally as important is mmeting the requirements of the Florida Building code, specifically for wind uplift. Product assemblies must be tested and approved. Select a product and then look up their product acceptance report which will indicate how the roof is to be attached.
Allan Reid
Dura-Loc Roofing Systems, Inc.

6/21/2006