SECTION 1807.4.2

FOUNDATION DRAIN

A drain shall be placed around the perimeter of a foundation that consists of gravel or crushed stone containing not more than 10 percent that passes through a No. 4 sieve. The drain shall extend a minimum of 12 inches beyond the outside edge of the footing. The thickness shall be such that the bottom of the drain is not higher than the bottom of the base under the floor, and that the top of the drain is not less than 6 inches above the top of the footing.

The top of the drain shall be covered with an approved filter membrane material. Where a drain tile or perforated pipe is used the invert of the pipe or tile shall be placed higher than the floor elevation. The pipe or tile shall be placed on not less than 2 inches of gravel or crushed stone complying with Section 1807.4.1, and shall be covered with not less than 6 inches of the same material.

CODE INTERPRETATION

This section provides the requirements for foundation drain placement. The section is precise in the requirements and provides a basis for design.

Foundation Drain:

1. Apply a drain around the perimeter of the foundation that consists of gravel or crushed stone. The gravel or crushed stone shall be a minimum of 4.75 mm or larger.
2. The drain shall extend a minimum of 12 inches beyond the outside edge of the footing.
3. The thickness shall be such that the bottom of the drain is not higher than the bottom of the base under the floor, and that the top of the drain is not less than 6 inches above the top of the footing.
4. Cover the top of the drain with an approved filter material.
5. If a drain tile or perforated pipe is used the invert of the pipe or tile shall be placed higher than the floor elevation.
6. The pipe or tile shall be placed on a minimum of 2 inches of gravel or crushed stone. The gravel or crushed stone shall be a minimum of 4.75 mm or larger.

DAMPPROOFING AND WATERPROOFING

SECTION 1504.5

EDGE SECUREMENT FOR LOW-SLOPE ROOFS

Low-slope membrane roof system metal edge securement, except gutters, shall be designed and installed for wind loads in accordance with Chapter 16 and tested for resistance in accordance with ANSI/SPRI ES-1, except the basic wind speed shall be determined from Figure 1609.

CODE INTERPRETATION

The intent of the code is to ensure that the design and installation of roof edge metals and copings meet specific criteria including material specifications, wind resistance of the edge metal and the structural integrity of the substrate that anchors the edge metal, i.e. nailers, etc. The key elements considered in determining the loads on the roof edge are:

• Wind Speed
• Occupancy
• Building Height
• Location of the edge material
• Building Location

ES-1 TEST METHODS

There are three test methods required under ANSI/SPRI ES-1. They are:

• RE-1: Roof Edge Termination Test
• RE-2: Pull-off Test for Metal Edge Flashing
• RE-3: Pull-off Test for Metal Wall Coping

ROOFING

Building Enclosure  |  BuildingEnclosureOnline.com  |  Winter 2023

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