Post Number: 2
|Posted on Wednesday, October 17, 2012 - 12:05 pm: ||
The outside of the gutter came with a finished color, but the inside is not painted. Note, I only have hips/ridges, no valleys. I assume valleys would be worse because large amounts of rainwater from the entire roof would wash over the copper in the valleys and enter the gutter at a single point. But ridges only get the direct rainwater that lands on them, and that then dissipates over the roof and gets diluted with the rest of the rainwater. So, I would think that would minimize the effects on the aluminum. Anyway, thanks for the DTM paint recommendation.
Post Number: 174
|Posted on Wednesday, October 17, 2012 - 11:20 am: ||
Is the trough of the aluminum gutter painted or just the outside? If its unpainted inside you may have issues. There's also a significant difference between runoff water in a horizontal gutter vs a perpendicular outlet and leaders. If you're worried you could hit the inside of the gutters with a coat of DTM paint.
Post Number: 905
|Posted on Wednesday, October 17, 2012 - 07:56 am: ||
Pretty much what LV said. If the aluminum is painted, it is copper to paint and not aluminum. It will react, but not as much as if it was touching. good luck!
Post Number: 50
|Posted on Wednesday, October 17, 2012 - 07:48 am: ||
FWIW, I have a (painted) aluminum ridge, (painted) copper built-in gutter linings, and (probably unpainted inside) aluminum downspouts, and I'm not losing a lot of sleep about all this. I figure the aluminum is pretty easy to replace if necessary.
There's also a church near me that has copper valleys/ gutters along with aluminum downspouts.
Post Number: 1
|Posted on Tuesday, October 16, 2012 - 11:56 pm: ||
I have a slate hip roof and (fairly new) aluminum gutters and am planning to have metal hip/ridge caps installed on the roof. I'm considering copper for the hip/ridge caps, but one roofing expert warned that the water runoff from the copper could cause pre-mature corrosion of the aluminum gutters and downspouts. Another roofing contractor, however, says he sees no problem with copper hip/ridge caps along with aluminum gutters, as long as the metals themselves are not touching/overlapping. Is this really something to worry about, or is copper OK in this situation? If there is a concern, is there anything that can be done short of replacing the gutters with copper gutters?