Flat Roofing in Wilmington

Not in itself -- water that clears within a day or two of rain is normal. Water still there a week later is a seam being tested continuously. In winter it is worse, because ice over an outlet means the roof has no drainage at all until it thaws.

EPDM at $5 to $9 a square foot and TPO at $6 to $12, and on normal residential additions either will do if the detailing is right. What matters far more here is upstand height and drainage, because both have to work with snow sitting on the roof rather than rain running off it.

Rarely the full term in this climate. The rating describes the material under test conditions, not a roof on a particular house north of Boston. What shortens it here is the melt-refreeze cycle at the eaves, roof space ventilation, and how well the thing was nailed on day one. A 30 year product commonly gives 20 to 25 real years here, and a roof with proper ice barrier coverage and a working ventilation path will beat one without by several of them.

For a standard asphalt roof on an average house, it is at the top of the range -- most Greater Boston single-family replacements land at $12,000 to $22,000. It is entirely reasonable for a large or steeply pitched house, a roof with a lot of dormers and valleys, or cedar shake at $12 to $20 a square foot. The number alone does not answer the question; what the quote itemizes does. If it does not break out area, tear-off, decking and the ice barrier, no figure can be judged.

It is a Florida rule and it has no force in Massachusetts. The 25% rule comes from the Florida Building Code Existing Building, where repairing or replacing more than a quarter of a roof within a year can require the whole roof to be brought up to current code. Massachusetts has no equivalent provision -- what governs here is the state building code and your own municipality's permitting. It turns up in searches because national content repeats it without saying which state it belongs to.