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  1. roberto222

    Vapor barrier under perimeter footing

    To explain basement retaining wall, lets assume that we cut our house/room with slab into the hill. Then the back of this room needs to be retaining wall which stem-footing will be L-shape. So under this footing we should not have vapor barrier to not compromise friction, but this footing could...
  2. roberto222

    Vapor barrier under perimeter footing

    Thanks for your answers. I was discussing with geotechnical engineers and they say that vapor barrier would compromise the friction between concrete and soil. Concrete footing around perimeter needs to "lock" into the soil. But what about if you have basement L-footing retaining wall. This...
  3. roberto222

    Vapor barrier under perimeter footing

    I always show vapor barrier under slab only. Should i extend it under perimeter footing as well? Talking about residential wood framed building with interior slab on grade and perimeter shallow footings. Why yes or why not? Also if you say yes, what about drain rock under the plastic under...
  4. roberto222

    Wood-steel composite beam...DF vs. PSL

    That is correct, but i don't understand that if i "convert" steel to DF, i use DF strength (1000psi). If I convert steel to PSL, I use PSL strength (2900psi), even if conversion ratio is almost the same as if converting to DF. Site conditions is wood framed building, using this sandwich beam...
  5. roberto222

    Wood-steel composite beam...DF vs. PSL

    If i design sandwiched wood beam with steel plates, then i use the ratio of steel elasticity modulus over wood... n=29000/1800=16...so steel converted to DF#1 will be 16x stronger.....and i will use fb of wood for this composite...plus/minus 1000psi What about PSL beams? n=29000/2000=14.5...so...
  6. roberto222

    Post tensioned slab on grade remodel

    Also I was thinking if the wedge effect at the end anchors couldn't be lost when it lost it's tension. So if the splicing with the splicer couldn't be a little without effect? And there is no way to check the original ends of the strands. Any thoughts?
  7. roberto222

    Post tensioned slab on grade remodel

    Here is a better photo. Does anybody know how can i set the prestressing load into the splicer if i don't know what was the stress before? Thanks.https://www.dropbox.com/s/kx40omnwc6b2v7j/20131025_160920.jpg
  8. roberto222

    Post tensioned slab on grade remodel

    Has anybody experience with strand splice chucks? Is it possible to use them inside of the slab cut without exposing the ends of the strands at the ends of the slab?
  9. roberto222

    Post tensioned slab on grade remodel

    here is the link to the photohttps://www.dropbox.com/s/w1q9c6y1ys7rh3i/20131025_110905.jpg
  10. roberto222

    Post tensioned slab on grade remodel

    The footings are most probably grade beams at 15' o.c. with perpendicular tendons over them for the slab. But the slab is sitting right on the soil, there is no any gap between.
  11. roberto222

    Post tensioned slab on grade remodel

    3 story, wood framed, 50'x300'. PT slab on grade with unbonded tendons. On asbuilts are shown continuous footings under bearing walls and regular slab on grade between. The contractor cutted one tendon when he was cutting the slab for new square ftg.
  12. roberto222

    Post tensioned slab on grade remodel

    I am doing remodel where is post tensioned slab on grade. I need to add some square spread footings below to support new columns. How can i get thru the slab? Can I cut the tendons? How would I retrofit them if i cut them? Thanks.

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