Roof is 4/12 with a 20 inch overhang. On bids for re-roofing we are getting different recommendations. All agree we need about 24inches of ice and water protection at the edges but that is where the differences begin.
One roofer says we must have 2 layers of felt the other says 1 will do (local code seems to have 4/12 as the cutoff for using either one or two layers).
What are the advantages of either / extra cost for two?
Then there is the question of architectural shingles versus 3 tab. One says 3 tab sheds water better on low slope the other says that architectural shingles will be more resistant against ice dams.
If it makes any difference to your recommendations: we are planning to have all insulation taken out of attic, all bypasses sealed, airtight boxes put over recessed lighting and 14" of insulation put back in.
Budget is tight, but we want the work done right