Usually 4/12, it will say on the bundle of shingles. At that pitch you would probably want a layer of bituminus underlayment under the shingles, at least anywhere where it is cold in winter.
The type of shingle you need really is a factor of what slope your existing roof has. A low slope roof needs a much different type shingle than a high slope, as water can intrude under the low slope. In this situation, a different type roof might be a better option.
26 square feet? That is not a roof that is a patch. 5' X5' is 25 square feet, so a minimun job call for a roofer, about $100
We were looking at shingle samples for our new roof.
Refer to Fastest Shingle Roofer answer
A shingle...
Depends on the type of roof and type of shingles used.
That depends. If this is a shingle or "steep slope" roof system, one layer of felt lapped 4" would be sufficient. A typical roll of #30 felt covers 200 sf.
The best method for cleaning a shingle roof using a shingle roof cleaner is to follow the manufacturer's instructions carefully. Typically, this involves diluting the cleaner with water, applying it to the roof surface, letting it sit for a specified amount of time, and then rinsing it off thoroughly with a garden hose or pressure washer. It is important to wear protective gear, such as gloves and goggles, and to work on a cool, overcast day to prevent the cleaner from drying too quickly. Regular maintenance and cleaning can help extend the life of your shingle roof.
The recommended overhang for a roof shingle is typically around 1 to 1.5 inches. This helps provide proper protection for the edge of the roof and also enhances the overall appearance of the roof.
It really depends on the size of the roof and how long you have to work on it.
Nope
A leaking roof can be a headache for many owners. In addition, a leaking roof can cause extensive water damage inside a home, potentially damaging the foundation. A shingle roof is simple to repair. Locate the damaged shingle on a rooftop, and pull back the shingles above it. Using a claw hammer, remove the nails holding in the damaged shingle. Check for any existing damage to the tar cover. If there is any damage, repair it with silicone or roofing tar. Place the new shingle under the existing roof shingles, and nail in place. Make sure no other shingles were dislodged.