How to Replace Single Tabs in Asphalt Shingles
This is the same process as replacing a whole roof shingle. A whole shingle is 3 tabs long. The steps outlined here are the basic steps for replacing shingles. You won't need a knife or hooked blade to replace the whole shingle.
What you'll need for this asphalt shingle repair job:
If a tab is missing where two shingles come together, there is a hole where water can go right into the roofing underlayment and under the singles. This will eventually cause a roof leak.
You will want to use your straight bar, a clean trowel or a putty knife to slide under and gently lift or 'pop' the shingles up. This cuts through the adhesive and is the path of least resistance, so you can go right through the shingles. You'll need to pop the singles up above the one you want to take out. You will need to pull the nails out of the one above that too, so pop that one also.
Use the flat bar to lift up the nails you encounter. Put the flat end under the shingles and pop the nail up, then the pry end on top of the shingle to finish pulling the nail completely out.
Using a hooked bladed utility knife works best for cutting on top of the shingles (the granule side). The top of the shingle will be about 2 inches or so under the shingle you are lifting. Find it and hook the blade onto i and pull straight towards yourself. Make sure you're not pushing down into the roof. Try to make a straight line down to the keyway.
When you find yourself needing to pry up nails, use the curled, pry side of the bar and if you need some help, tap on it with a hammer. Don't bust your knuckles pressing down on it too hard.
It's best to pull whatever nails you come across, even if the shingle comes up with the nail still in place. While many people might think to just hammer it into the roof because it's easier than prying it out, the problem is that you can't drive another nail through it in that same space if you do that. And most likely, that exact spot is where you'll want to place the new nail. So take the extra time and effort and fully pull any nails you come across
When it comes time to cut the shingle to size, sometimes you have to cut at a slight angle so the shingle will lay flat, because you won't always be able to cut it perfectly straight. Making two cuts makes this easier to do.
To be clear, when you're cutting shingles, you want to use the hooked blade if you're cutting from the top - the side with the granules. If you're cutting from the bottom - the smooth side - you can use a straight blade.
As you begin to put the shingle in place, you can spread some roofing cement underneath it just for a little extra protection and security before hammering the nails into place.
When you do nail the shingles, nail them about an inch back from the edge. You should be able to see where the nails were. Then re-nail the existing shingles, just not into the exact same holes.
If it's an older roof, adding a bit of roofing cement is a good idea. The new shingles have new adhesive on them, but the old shingles aren't going to stick on their own. Also, as long as you're there working on the spot, adding a bit of roof cement will ensure that you won't need to deal with that spot on your roof again.
When applying the roofing cement, make sure to put it on the seam and on the nails, always underneath and not on top. This will help seal everything up while also helping to stick the tab down. Any extra roofing cement and it is just helping to stick the tabs down and together.
How To Repair A Leaky Asphalt Shingle Roof
today we are going to repair this asphalt roof as you can see there is a very good crack along as fall along the shingles as you see there are some other ones that work well done with a little the roofing cement but no no fabric was used so that opened up again and here you'll be needing a brush to clean out the crack scissors to cut the fabric and the cement a quick note about this rough cement its fiber reinforced plastic rough cement and it can be used in wet or dry conditions to cement the fabric to the crack first I'm going to clean out crash damp crack you now use the gloves to spread the rough patch cement in to and around the crack you I'm using gloves instead of a Trowell because i find it easier in cold weather spread it a little wider than the fabrics with there now apply by fabric I cut it to the landing I'm not you match like that how you want to apply another coat all right you finished that is all there is to it
You can go here to read more on Tile Roof Leak Repair Basics