I am going to have my leaky, 2.7"/12", 20 year old, three tab asphalt shingle roof redone, so I have been trying to educate myself on what I have and what to replace it with.
In So Cal we get occasional wind with our rain and it blasts the west side of the house. It looks like that the main failure of my roof is that many staples on the west side have rusted right off allowing shingles to flap up by the wind. The holes in the tar paper left by the rotted staples are probably the main source of leaks. My shingles don’t look that bad and would probably have gone at least a few more years if they had just used galvanized or stainless staples. I notice that the staple placement is usu no more than 1" from these slots which form a natural channel for the wind blown rain. All in all these three tab seem like a pretty poor design for something that’s supposed to shed water.
If I understand this right, a three tab shingle is a perfectly good waterproofing material that someone has gone and cut slots in for cosmetic reasons. Is there any other reason for these slots? The architectural shingle is somewhat better, but there are still slots (gaps) where the shingles butt together.
I noticed down at HD I can buy these 3ft wide rolls of shingle material. It isn’t going to look like a shingled roof, and you would have to deal with lots of exposed fasteners, but talk about easy. What I am leading up to is why isn’t there a shingle type that is just one continous roll of shingle width material? Just roll out 50ft at a time. It has got to be faster and better waterproofing than the slotted stuff. They could even use the coloring techniques to give it the slotted/shadow appearance, or just make it two layer like architectural shingles.
I am not a roofer so this may be a bad idea for reasons I am unaware of. What do you think?