Are ‘Hot Roofs’ allowed in Minnesota?

- The code is not intended to prevent the installation of any material or to prohibit any design or method of construction not specifically prescribed by the code, provided that any alternative has been approved. The details of any action granting approval of an alternate shall be recorded and entered in the files of the Department of Building Safety. An alternative material, design, or method of construction shall be approved where the building official finds that the proposed design is satisfactory and complies with the intent of the code, and that the material, method, or work offered is, for the purpose intended, at least the equivalent of that prescribed in the code in quality, strength, effectiveness, fire resistance, durability, and safety. ..More

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Improper Shingle Nailing

- The other most common nailing defect that I find with asphalt shingles is improperly located nails; specifically, high nails.  This is probably why I don’t find this defect all that often; it’s just too obvious of a defect for most roofers to leave uncovered.  When shingles are located too low on a shingle, it’s an obvious defect that anyone with a good eye can usually spot from the ground. ..More

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Low levels of carbon monoxide will not set off UL listed CO alarms

-  Another low-level CO monitor is the NSI 3000.  Even though this web site looks like it was designed in the early 90’s without being touched since, it has some good information. .  There are numerous studies saying that low levels of carbon monoxide exposure cause health problems; there are links to many such studies at CO-Experts Home Page. Does this mean that low levels of carbon monoxide are safe?  No ..More

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Shut-off valve basics

-  The ball valve below is in the open position.  This makes it easy know if a ball valve is open or closed, just by looking at it. .  When it’s perpendicular, it’s closed. When the handle of a ball valve is parallel to the valve or pipe, it’s open ..More

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Plumbing Vents Covered with Frost

- .  The plumbing code requires plumbing vents to terminate at least 12″ above the surface of the roof to help prevent the vents from getting blocked with snow, but the higher the vent the greater the potential for getting blocked with frost. Another way to help prevent plumbing vents from getting covered over with frost is to keep them short ..More

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