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  1. mjr6550

    Waterproof Concrete Block from inside?

    If you have a public water supply you could install a water powered sump pump. They use a lot of water when operating, but no battery to worry about.
  2. mjr6550

    Limitations to strengthening a steel I-beam

    I am looking for some input from those with more experience. I seldom do much engineering with steel. I have a client who wants to remove a column in the basement of a single family dwelling. The existing beam is a W10x26. The full span is approximately 29 feet with concrete foundation walls...
  3. mjr6550

    Foundation compaction grouting

    I've only seen it used for lifting slabs. One company I looked up says lifting forces up to 6000 psf are possible.
  4. mjr6550

    Structural Ridge Splice

    I assume that this is a structural ridge based on the size. As in no ceiling joists or suitable collar ties. What had been supporting the post?
  5. mjr6550

    Foundation compaction grouting

    IMO polyurethane injection is a good substitute for mud jacking-filling voids below a slab. I have never heard of it being used for compaction grouting. Maybe it is a legitimate method and maybe it is just someone with a franchise winging it.
  6. mjr6550

    Ripping TJIs to Stiffen a Floor?

    Over 16' span is pushing it for 2x10's. You only have 10' of floor load, but the knee walls can transfer roof loads down to the joists, unless the roof is stiffer than the floor. You will also get some additional deflection over time added to what you have. I would second the option of using...
  7. mjr6550

    Drilling a new drain hole in floor

    I often use a rotary hammer drill. Not much vibration. You could buy a cheap core bit just to get a clean cut at the surface and then drill the rest.
  8. mjr6550

    Eastern Red Cedar

    You could try Northeastern Lumber Manufacturers Association: NELMA www.nelma.org/
  9. mjr6550

    I-beam out of plumb-2

    The plate looked level. The web buckled near the bottom flange.
  10. mjr6550

    I-beam out of plumb-1

    I saw that this I-beam (24 inch deep) shifted out of plumb by about 2 inches. Then I looked at the other side and saw that it was well braced ;)http://files.engineering.com/getfile.aspx?folder=6a4866ad-b6cd-4aba-8f4f-3a312e7c64b1&file=P9211752_(1024x683).jpg
  11. mjr6550

    I-beam out of plumb-2

    I saw that this I-beam (24 inch deep) shifted out of plumb by about 2 inches. Then I looked at the other side and saw that it was well braced ;)http://files.engineering.com/getfile.aspx?folder=a4ac69fa-ab2b-41a1-a865-5fe40a7f6872&file=P9211750_(1024x683).jpg
  12. mjr6550

    Moving Cart Design

    Limited info to go on, but solid plywood sides, even if only half the full height may help quit a bit if properly nailed or screwed and glued at the bottom edges and corners.
  13. mjr6550

    Digging out a crawlspace

    I have seen this done quite a few times. It typically seems to have worked,but I would not be comfortable specifying this method.
  14. mjr6550

    Rolls-Royce Merlin Engine

    I would like to know what they are doing around 18:10 in the film. Looks like a hollow pushrod or similar. Are then brazing?
  15. mjr6550

    Workman's comp insurance

    I am in PA and that is the case. Not required and cannot file a claim.
  16. mjr6550

    Erosion under driveway

    With no rain gutters it is not surprising that this would happen. Water has to go somewhere, and the soil below the driveway was fill. Urethane injection could work (if you plug the open ends), but the job may be too small for many contractors. The price has come down and there are more...
  17. mjr6550

    Deck post footing at edge of a 45-degree hillside

    You will not find any references in the IRC that will be applicable. If a concrete pier footing is used it will have to extend deep enough to stable soil and meet requirements for depth based upon the geographic area. Another option could be helical piers and perhaps a reinforced cantilevered...
  18. mjr6550

    structural wood glue

    It has been a while, but a couple years ago I looked into structural adhesives quite a bit. If I recall correctly, very few adhesives did not exhibit creep. Also, almost all had disclaimers about structural use. I believe that polyurethane was an exception. I don't typically specify using...
  19. mjr6550

    Failing retaining wall at existing driveway

    PEinc. You suggested that maybe nothing has to be done to the wall. If that is the case and they are concerned about the driveway, then my suggestion may be a way to address the driveway.
  20. mjr6550

    Failing retaining wall at existing driveway

    PEinc, I don't know how bad the wall looks. If injection is done carefully to fill voids and not lift the driveway it can be performed without exerting much pressure. That may prolong the life of the driveway. The concern seemed to be damage to the driveway. If the retaining wall is in bad shape...

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