yes, i am not trying to sound like a smart alek but if you don't know the answer please seek advice from a professional roofer you will be better off in the long run.
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Check with the info on your shingles, some recommend NOT putting down tar paper first others go as far as voiding the warranty if you do install them over tar paper.
Personally, I would not put shingles on my own house without tarpaper, it is a cheap and fast extra layer of protection from water that can cause a lot of damage sometimes before you can see it.
no, you may start to shingle right over the old asphalt shingles.
It is just better for your roof and makes it last longer
Paper the whole roof!
Your local building codes will provide what they require. In general on a new roof felt paper is only required for the first 3 feet for a pitch of 6/12. For lower pitch roofs the entire thing should be papered. Most roofers now use a new membrane called "Ice and water shield" for the first 3 feet and recommend using tar paper for the rest of the entire roof. The cost difference for papering the entire roof is minimal and provides much more protection.
You should contact a roofing specialist to decide whether you need a new roof or not. But in the past my shingles roof has worked very successfully to weather conditions.
No. They cut out the original roof, and place the fiberglass in place over the hole. You could remove if you welded on a new roof panel.
It should cover your roof for accidental damage, it will not cover a new roof if it needs replacing due to age.
No. Never chance trapping moisture during construction.
You tear the old roof off with one of those shovel looking thing that have teeth on the end. Remove the old felt paper and the nails and chingles. Then inspect the decking. Replace any decking that is rotten. Then put down new felt and flashing and replace shingles. Good luck.
yes it should be removed. the new metal roof acts as its own drip edge
This depends on the age of your roof. If your roof is relatively new you may just need to replace a few shingles. If however, your roof is near it's warranty limit you should consider replacing the whole roof.
Patch your roof. If you can afford it put a new roof on the house. This may not be affordable so you can try to patch it. You should use the same roofing material that is on your roof.
If there is only one set of shingles on the roof, cover over it. If two, remove the old and then apply the new.
If the shingles are buckled they need to be removed before applying new ones. If they are in fair shape, then keep the old shingles on if there is only one layer.