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Fillable sq 1 1481 combination roof and overflow

Roofdrainexpress josam-22500-combinationJosam 22500 Combination Roof Drain & Overflow 2025

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The document describes a combination roof drain designed for flat roofs, which functions as both a conventional roof drain and an emergency overflow drain. It includes specifications such as dimensions, materials, and optional features like vandal-proof domes and stainless steel components. The document emphasizes the importance of proper installation and provides contact information for the manufacturer.

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Where should the secondary overflow drain discharge on a flat roof?

The secondary roof drains shall be located not less than 2 inches (51 mm) above the roof surface. The maximum height of the roof drains shall be a height to prevent the depth of ponding water from exceeding that for which the roof was designed as determined by Section 1101.12.

How often do you need a roof drain?

At minimum, you should inspect flat roof drains once a month. Other times to inspect roof drains, include: After a storm, especially one with heavy winds and/or hail. In the fall, daily if the roof is exposed to leaves and other debris.

How far apart should roof drains be?

A good rule to follow is to provide two roof drains for a total roof area less than 10,000 square feet. An additional roof drain should be added for each 10,000-square-foot area. The drains should be placed at a maximum of 75 feet in each direction away from each other.

Why are there two roof drains?

This is a plumbing code requirement. The overflow or backup roof drains protect the flat roof from caving in under the weight of standing rainwater should the main drains become clogged with debris.

What is the spacing for roof drains?

a drain at most 50 ft. from the edge of a valley. Keep the distance between drains to at most 200 ft. Provide adequate flashing for parapets, openings, walls, joints, skylights, etc.

Are overflow roof drains required?

An overflow roof drain system is not required for a flat style roof if parapet walls are on no more than three sides and provided that the open side of the roof edge has an elevation of two inches or less above the low point of the roof. (For sizing requirements, see Tables 49-1204a and 49-1204b.)

What is the rule of thumb for roof drains?

The rule of thumb for roof drains is that you should have at least two drains for areas up to 10,000 square feet, and at least four drains for larger roofs, accounting for the overflow rate as well. Proper drainage is crucial to prevent water accumulation and damage.

How do you calculate the number of roof drains?

Take the roofs total square footage and divide by the total square footage handled by one drain. The result is the number of drains needed. For example: 50,000 / 4,400 = 11.36; or 12 drains required.

Roofdrainexpress josam-22500-combinationJosam 22500 Combination Roof Drain & Overflow 2025

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