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Drain Pipe perforations orientation
Conventional practice calls for placing retaining wall drain pipe with the perforations down. A contractor on one of my jobs was confused by the pipe he got that had perforations on opposite sides. If he put the perforations down, there would be perforations up. What to do? He compromised and...- rollofox
- Thread
- Replies: 10
- Forum: Foundation engineering
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Coefficient of Friction for Slab on Grade
By the way, a sand cushion under a slab may be a liability. See; http://www.buildingscience.com/resources/foundations/sand_layer_under_slab.htm- rollofox
- Post #6
- Forum: Structural engineering general discussion
