It really depends on the size of the roof and how long you have to work on it.
You first have to measure your roof. Shingles are sold by the square. You will have to find the replacement shingle that you are interested in, then take your roof measurement to see how many squares you need. You might think about using a metal roof. They cost more at first, but last a lot longer.
You don't shingle with pancakes.
You buy shingles by the square. Three bundles cover one square. A square is 10x10. So four bundles should be more than enough.
Strip off the old roofing and decking and replace it with thicker plywood, then apply the asphalt paper and re-shingle.
If tin shingles are newer, they are probably cheaper. However, take into consideration that when it rains, tin will be much louder. Cost is second to noise, unless you have good earplugs!
From the moment the material is delivered to your property to final inspection of your new roof is about 1-2 weeks. There will be city inspections scheduled in between that’s why it may take up to two weeks. There will only be about three days of actual work during this time frame.
456
70 x 34 = 2380.. every 100 square feet makes 1 square,, so 2380 = 24 squares plus your cuts and ridges & starters,, usually you would figure an extra 2 squares.
To mend the shingles you require some roof repair materials. They are - roofing cement, aluminum flashing and a flat pry bar. The width of the flashing should be 1 inch lesser than that of the damaged strip of the shingle, and the length should be 4 inches more than it. Take the required measurement of the shingle and cut the flashing accordingly. Then you have to loosen up the damaged strip and the adjacent strips on its both sides with the help of pry bar. Now apply some roofing cement below the shingle where the flashing has to be placed. Insert the flashing under the shingle and put some more cement above it. Finally, put some pressure on the shingle so that it gets attached to the flashing properly. Or better yet, contact a roofing contractor.
Two.
Shingles vary in dimensions, and sometimes there are specific bundles of shingles made for the sole purpose of ridge coverage. If you are using the house shingles for ridge, take the length of ridge to be covered, divided by the exposure of the shingle to determine the number of ridge pieces needed. Normally you will get three pieces out of one full shingle. Once you determine the number of full shingles, find out how many shingles are in a bundle and purchase the smallest bundle of shingles necessary to complete the job.
You cut rafters, brace them as needed depending on the span and shingle it. I put one on a friend of mines. I cut the outside ends of the rafters at an angle so that I didn't need to change the fascia. Lay a 2x6 flat on the existing roof to run the braces down to. Your roof may not be flat but have a slope one way on it so you will have to take that into consideration for the peaked roof. He had a slightly sloped roof with tar and gravel on it and at the time I was able to put a pitched roof on for less than they wanted to re tar the flat one.