After 110 years have passed there would definitely be needed inspection of the roof boards for rotten sections. But for a newer home 20-30 years old there should be less issues with the roof. Gutters, facia, soffits should still be in good condition. Vents probably could take replacement. I also don't see why it would be difficult to nail new shingles on top of the old ones, unless the old shingles were curled then re-roofing would not work.torontotim wrote: ↑ How does re-roofing make this more DIY than a proper roofing job? If anything, it would be more challenging to put new shingles over old than the simply brute force labor to remove the old roofing and then roof over a nice smooth uniform surface.
I'd never put new over old anything - flooring, drywall, siding, roofing... always strip it down as far as possible and build up new again. Just had Coverall Roofing out to do some flat, shingle, siding and soffit/fascia work. Stripped everything down to the 110 Year Old original surfaces.
Just saying from a DIY perspective there's no difference in difficulty.cheapmeister wrote: ↑ After 110 years have passed there would definitely be needed inspection of the roof boards for rotten sections. But for a newer home 20-30 years old there should be less issues with the roof. Gutters, facia, soffits should still be in good condition. Vents probably could take replacement. I also don't see why it would be difficult to nail new shingles on top of the old ones, unless the old shingles were curled then re-roofing would not work.
I agree with the weight being an issue. But I also read that a roof can be re-roofed 2 additional times. So the maximum allowed is 3 layers of shingles.DoorCrasher wrote: ↑ Like said, you are hiding potential issues with the deck, and, above this you add weight. Taking into consideration that a roof shingle pack can weight +- 70 lbs, leaving old shingles add weight to the structure.
Now, removing the old shingles is not more DIY. It is easier to remove old shingles with preper tools than install the new ones
Three layers?!?! That is insane. Can and able, doesn't mean should. You never know how well the previous install was done. There could have been some water leaking under the old shingles somewhere.cheapmeister wrote: ↑ I agree with the weight being an issue. But I also read that a roof can be re-roofed 2 additional times. So the maximum allowed is 3 layers of shingles.
cheapmeister wrote: ↑ I agree with the weight being an issue. But I also read that a roof can be re-roofed 2 additional times. So the maximum allowed is 3 layers of shingles.
Were you charged more because the 3 layers of shingles needed to be removed?smacd wrote: ↑ In our area where UV is very strong (2,000 hrs of sunshine/year) multi layers of shingles is common. When we had our roof done, 3 layers came off. The house was built in 1964. We are the second owners, having bought in '92, so the previous owners reroofed every 10 years. We did the roof around 2005 and stripped to the shiplap 1 x 6. Iko required us to sheet everything over the shiplap to maintain warranty. Although I choked on the $17,000 price tag, the roof still looks brand new to this day.
The full layer of plywood is likely where a good chunk of money went.cheapmeister wrote: ↑ Were you charged more because the 3 layers of shingles needed to be removed?
It wasn't broken down by individual costs, but certainly I paid for the labour involved and for the removal charge of the dumpster.cheapmeister wrote: ↑ Were you charged more because the 3 layers of shingles needed to be removed?
