Replies

1. 
   florida | Jul 08, 2015 10:31am | #1

   Sure, use a sharp utility and/or an oscillating tool witha fine blade. I'd probably tack  a 1X4" up as a straight edge as well.

2. 
   DanH | Jul 08, 2015 02:19pm | #2

   I'd try good avaition snips, perhaps the "nibbler" variety, and also try a Multimaster or knockoff with a fine metal blade or an abrasive one.  Likely you'll want to use a combination of tools.

   A lot depends on how heavy the AL is and how tightly fastened, plus how awkward a position you manage to be in.  (Seems like there's always a bad  corner to deal with.)  The potential problem with the Multimaster is that it will shake the loose AL so badly as to wrinkle/tear it (and make a terrible racket), while the snips simply may not be able to get close enough to cut what needs cutting, especially where the sections join.

3. 
   calvin | Jul 09, 2015 07:52am | #3

   I have done this..

   Plywood blade put on a circular saw backwards.

   a shoot board to run the saw on is ideal, but a pc of laminate taped to the sole of the saw works as well when free handing.  This keeps you from easily marring the finish on the siding.