Accepted Answer

Hi Conor

These specs would be for a roof in a cold climate. 15# felt as an underlayment is good practice but not required. You should have a miniumum of 6' of ice and water barrier starting at the drip edge and extending up the roof as well as at least 3' in any valleys. Typically a 7" drip edge is installed then the ice & water laid over the drip edge flange. Any defective roof sheathing should be replaced either with similar material or the entire sheathing surface can be covered with ply wood if the condtion of the sheathing is generally inferior. A 3" drip edge is also typically installed along the rake edge. Any rotted fascia should be replaced. If there are also gutters I would recommend using Azek or similar expanded PVC trim boards (for the fascia) which will not rot. Any dormers should be step flashed where their siding intersects the roofing. Dormer siding should be held a minimum of 1/2" above the top of the roofing. Finally if you want a 30 years roof get 30 year shingles.

Expert:	Rick
Pos. Feedback:	100.0 %
Accepts:
Answered:	10/20/2009

General C&ontractor

Licensed Construction Supervisor & Remodeling Contractor 35+ years experience