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Old 07-16-2010, 02:10 PM   #16
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In the 2009 IRC, it says the following... It's around the part "...be covered with an approved filter membrane material". Just looking for some clarification.

Thanks!



R405.1 Concrete or masonry foundations. Drains shall be provided around all concrete or masonry foundations that retain earth and enclose habitable or usable spaces located below grade. Drainage tiles, gravel or crushed stone drains, perforated pipe or other approved systems or materials shall be installed at or below the area to be protected and shall discharge by gravity or mechanical means into an approved drainage system. Gravel or crushed stone drains shall extend at least 1 foot (305 mm) beyond the outside edge of the footing and 6 inches (152 mm) above the top of the footing and be covered with an approved filter membrane material. The top of open joints of drain tiles shall be protected with strips of building paper, and the drainage tiles or perforated pipe shall be placed on a mini- mum of 2 inches (51 mm) of washed gravel or crushed rock at least one sieve size larger than the tile joint opening or perforation and covered with not less than 6 inches (152 mm) of the same material.
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Old 07-16-2010, 02:36 PM   #17
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The section of the IRC I referenced above DOES seem to mention covering both the perforations of the drain tile and the "drain." The drain consists of the gravel and may or may not include drain tile: "Where a drain pipe or perforated tile is used . . ."
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Old 07-16-2010, 03:36 PM   #18
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thanks for the response.

Sometimes these codes are a little confusing.
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Old 07-16-2010, 04:10 PM   #19
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The purpose of the drain tile is to maintain the groundwater table lower than the basement floor slab. In some cases, the footer is considerably deeper than the slab, for example a slab on grade design with footers around the perimeter. There is no reason to place the pipe more than 6 inches below the bottom of slab, the goal is to keep the slab dry, NOT the footers.

The purpose of the clean gravel (or crushed stone) is to provide a path for the groundwater to enter the perforated pipe. That is why the gravel is installed wider than the pipe, below the pipe, and above the pipe. The purpose of the fabric is to protect the gravel from entrance of fine material, hence you need to wrap the gravel with filter fabric. Wrapping the pipe is unnecessary if the gravel is surrounded by filter fabric. Wrapping the pipe alone does little good if the gravel becomes choked with fine material, since the groundwater will be unable to percolate freely through gravel choked with fines, and your pipe will not effectively collect water.

I prefer to design the system to bring the gravel up to within a foot or so of the surface, that way you can collect surface water and direct it downward to the drain. If you have sandy or gravelly soil, this is not necessary.
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Old 07-16-2010, 05:16 PM   #20
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http://www.servicemagic.com/article....age.13702.html

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Old 07-16-2010, 06:46 PM   #21
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Quote:
Originally Posted by Daniel Holzman View Post
The purpose of the drain tile is to maintain the groundwater table lower than the basement floor slab. In some cases, the footer is considerably deeper than the slab, for example a slab on grade design with footers around the perimeter. There is no reason to place the pipe more than 6 inches below the bottom of slab, the goal is to keep the slab dry, NOT the footers.

The purpose of the clean gravel (or crushed stone) is to provide a path for the groundwater to enter the perforated pipe. That is why the gravel is installed wider than the pipe, below the pipe, and above the pipe. The purpose of the fabric is to protect the gravel from entrance of fine material, hence you need to wrap the gravel with filter fabric. Wrapping the pipe is unnecessary if the gravel is surrounded by filter fabric. Wrapping the pipe alone does little good if the gravel becomes choked with fine material, since the groundwater will be unable to percolate freely through gravel choked with fines, and your pipe will not effectively collect water.

I prefer to design the system to bring the gravel up to within a foot or so of the surface, that way you can collect surface water and direct it downward to the drain. If you have sandy or gravelly soil, this is not necessary.

Very well said Dan, I couldn't agree more.

Plus, the benefit of stone to within 12-18" of grade is that you don't need to mantain the settling soils for man years to come.
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