Join Date: May 2012
Thanked 283 Times in 133 Posts
I'll preface this by saying: I AM NOT A PROFESSIONAL ROOFER.
But, in my youth, I worked as part of a crew that put on a roof or two, metal, roll, and asphalt shingle. So I've seen how a roof goes together.
Today I was just surfing around the internet looking for things pertaining to a job I'm bidding. It's an outbuilding roof that needs replacing. It's asphalt shingle. I was figuring up the squares I was going to need and I remeber a square as being 9 feet by 9 feet or 81 sqft of coverage. But, it's really been awhile since I had learned that bit of trivia. So, just being curious and thorough, and to be sure they hadn't down sized shingles. I went on a hunt. I came across an article on ehow.com about putting on a shingle roof. As part of the instructions it says :
"Place and lay out the roofing felt over the plywood boards that form the first layer of the house’s roof. The boards are placed and nailed down by the carpenters who worked on the house, so you need not concern yourself with this layer. When putting the felt down remember that this is meant to be a waterproof seal on the roof. Lay the felt down one roll at a time. They should be in vertical rows from the apex of the roof down to its edge; the sides of each row should overlap slightly. Nail the sides of one row firmly into place before moving onto the next until the entire room is covered."
There a part of that instruction that goes against the way I've seen it done, and always done it.
They should be in vertical rows from the apex of the roof down to its edge;
Anybody else do it this way? And if so, why? I've always rolled the felt out horizontal, starting at the eave working up to the peak. With each row overlapping the one beneath. Thus giving a shield that runs down the roof and can shed water even if the shingle becomes damaged.
Running it verticle would also seem to be dangerous. Since you are at the eave cutting off a heavy roll of felt so many times. And having to control the roll all the way down so many times.
Look forward to seeing the responses.