4. Barriers to flow: Many of the walls, unless modified, will provide barriers to water drainage. There are two possibilities: a) install these walls over high-strength sheet drains that will allow free flow of water under the length of these walls, or b) provide substantial scupper openings at all low points. We recommend building rectangular scuppers into the walls, each several inches high and a foot, or more, in length. We can work with the design team to determine how best to design and position scuppers.
Refer to detail attached (from #3). We had planned on providing weep holes at the bottoms of walls to allow drainage of water. // See comments above—we recommend large rectangular scuppers or, alternatively, casting the walls on top of sheet drain. Please provide a drawing showing the size and locations of weep holes so that we can submit these to our structural engineer. Please note that the engineer has already given us a max penetration through beams (of which we have a few we will need to drain through) of 2" diameter. // beams are a special case, since these must be cast in the initial pour and they are structural. You mentioned that circular penetrations are not as effective as rectangular. Please confirm your preference. // We definitely want rectangular openings. If a 2” clearance is dictated by the engineers, then we would suggest a series of 2”x8” or 2”x6” sleeves be placed through the beams before the pour (we suggest Certainteed Form-A-Drain for this purpose). Can you confirm this with your engineers? Also, we need to think about installing 2” diameter pipe sleeves through the beams (and walls) for electrical and irrigation lines. A preliminary layout for plumbing stub-ups, irrigation supply lines, and electrical conduit should be prepared before the slab and beams are cast. William Koh the structural engineer will need to know the the worst case scenario of the spacing between weep hole locations along the planter walls.
No comments:
Post a Comment