Pic Shingles More Condition_symptoms Question About Roof Shingles. When Places Like Home Depot...?

Question about roof shingles. When places like Home Depot...? - pic shingles more condition_symptoms

In some places like Home Depot have their circulars and advertisements to announce the tile, say something like: $ 15.99 and then a picture of a brick, now, is that for a box of pebbles or shingles, is it? And if you reach a field, usually, how many tiles a field? Thanks