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  1. rlmengineer

    Squash blocks detailing for concentrated loads on trussed floors

    I would ensure the column doesn’t fall on a floor truss. Cut out the subfloor and support the column on a footing or pier. Unless the floor truss was designed to carry a concentrated column load your going to cause a localized dip in the subfloor.
  2. rlmengineer

    Fire Damage to Roof Framing

    I recommend replacing any member charred over 1/8” deep and any sistered rafters need to be full length. Ridge boards would not be necessary if the rafters are directly opposite each other, but one of your photos shows the new sistered rafters with nothing on the opposite side. Not knowing the...
  3. rlmengineer

    Radiant Heated Floor Slab

    Since most airplane hangers are large what are your plans to protect the PEX tubing from gas and oil spills at construction and expansion joints?
  4. rlmengineer

    Strength grading for small cross section timber

    Would any fasteners have enough pullout capacity needed for lateral or uplift wind forces, plus the potential of fasteners splitting the 2x2 lumber?
  5. rlmengineer

    Perpetually moist concrete slab

    You might try lowering the water table by installing a few sump pumps several feet below the floor.
  6. rlmengineer

    Precast Parking Structure: Double Tee Production & Bearing Connection

    Salt water will rust any exposed steel bearing plates. I would recommend using elastomeric neoprene bearings to allow for some thermal movement
  7. rlmengineer

    Residential Girder Detailing

    Designing the temporary support for the existing floor, exterior wall and brick veneer will need to be designed first in order to remove anything. You will have to stage the construction to remove the existing wall, insert the new beam, support columns and footings, if needed. Your temporary...
  8. rlmengineer

    Pole barn spike

    Try to pull one of the spikes out or at least far enough to measure the spikes head and shank diameter. Cross reference that information with published data.
  9. rlmengineer

    Basic Overturning Question

    Take moments about the left edge of the foundation because that's where the foundation would rotate if it were to overturn. Check the bearings capacity of the soil under tge slab and check the required reinforcement in the slab.
  10. rlmengineer

    Contractor needs to drill holes through W16 for utilities

    Make sure the holes are cut smooth with a diamond core saw. A jagged hole cut with a torch will likely cause stress concentrations creating cracks that radiate outward.
  11. rlmengineer

    More Engineered Beam Issues?

    The PLS beam appears weathered where the I-joists look like new. My guess is the beam was exposed to the weather prior to installing the I-joists. Engineered beams can’t take much water before dry rot starts to damage the beam. Sagging and crushing over the supports are usually a sign of dry...
  12. rlmengineer

    Wall sign on building

    What is the wall covering?
  13. rlmengineer

    Residential Monolithic Footing Exposed Rebar

    I have seen several foundation walls were with horizontal cracks where snap ties were not removed and patched properly. Water will seep in around the snap ties and corrode any reinforcement that was placed on the snap tie for support. The rebar expansion will form horizontal wall cracks, which...
  14. rlmengineer

    PARKING STRUCTURE TOPPING SLAB

    I would be concerned with chloride intrusion and section loss in the reinforcement inside the double tee beams. I would recommend a forensic assessment before doing anything.
  15. rlmengineer

    new concrete retaining wall / abutting existing rubble wall

    I recommend removing the rubble wall and extend the new retaining wall. Too many hidden issues with the existing house and foundation. I would recommend a construction joint between the new retaining wall and whatever your client wants to do with the existing house and foundation to allow future...
  16. rlmengineer

    CMU Wall Removal

    Stage 1 - Prepare to support the remaining masonry block wall by grinding out part of the horizontal mortar joint and inserting an angle iron. Stage 2 - Install the new vertical steel column. You may have to beef up the new columns to accommodate the moment induced by the remaining block wall...
  17. rlmengineer

    CMU Wall Removal

    Though about offsetting the support column to the side of the wall and supporting the remainh masonry wall on the side?
  18. rlmengineer

    contractor not following plans... at all

    If the project looks good and everyone likes it they ask who was the contractor. If something goes wrong everyone, including the attorneys, will ask who was the engineer.
  19. rlmengineer

    Soil Supporting Garage Slab

    How deep is the fill material?
  20. rlmengineer

    Punching Shear

    My thought is the blocks would not necessarily crush, but the mortar joints of the blocks supporting the plate would shear along the red line as depicted in the attached graphic.http://files.engineering.com/getfile.aspx?folder=b3b9af2c-70fe-42de-9bee-16ba9eddea07&file=Punching_Shear.jpg

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