Aluminim roof, gutters...

Hello,
I have an aluminum roof, that previously had gutters. Now i have water building up at doorways. Are there any kind of "gutters" or rain catchers i can get to replace the old ones? or will i have to put in some sort of overhang above all my doors? Snow is particularly difficult, love that it comes off the roof, but blocks walkways, etc. are there some sort of "guards" available for this type of thing?
any input would be helpful!
thanks!

 

On some houses it's practical to put some kind of "diverter" on top of the roof over doorways and such. Basically it's just a piece of flashing shaped like an "L" that is attached to the roof to block water that wants to drip on your head where you walk. You do kind of have to be careful when installing something like that because the risk is that you'll create an ice dam behind it.

But I would think that gutters could be attached pretty easily.

 

Thanks for the advice! I was afraid gutters may be torn off by snow build up or ice? Many "roofers" suggest they may not last...

 

If you are in the snow-belt, the snow will slide off an aluminum roof. Gutters that are positioned for an asphalt roof generally have to be lowered when changing to aluminum. We use the rule that the outside edge of the gutter should be at least 1 inch below the slope-line of the roof. That way, the snow accumulation in the gutter is usually not enough to create a "mound" which will be hit by the snow sliding off the roof.
The other thing to consider is how strong the fascia is into which the gutter spikes are nailed. If the fascia is relatively weak, then it won't take much to damage the gutter, since the support isn't there.
As for installing diverters and the like, it is very important to have the proper ice-and-water shield membrane protection installed UNDER the aluminum, so that when the diverter is screwed down (through the aluminum panel or shingle), that the screw-hole isn't a new leak point. Xsleeper's point about potential ice-dams is also relevant, and when we install anything on top of an aluminum roof (diverter, snow-stopper or snow fence), we expect an ice dam to form behind them, and we install membrane over the appropriate area to counter the ice-dam formation.