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21

The white marks are joint compound (aka "drywall mud") - kind of like plaster. The stripes are where separate sheets of drywall are joined with tape and mud and the little splotches are where screw holes have been covered over with mud. Those actually are good places to install your storage rack because they indicate the locations of the lumber framing that ...


9

This is what an unpainted surface looks like. Those white marks are joint/drywall compound and under them are screws holding the drywall to the joists. The long white lines are the same thing except on a junction between two sheets of drywall. So there are screws and a seam under them. You can install a rack along the white marks but not directly in the ...


4

To me that looks like a water leak that is being pushed by the air flow. I would be checking for a leak above that location.


3

It's a water stain, either from a leak as Ed stated or condensation. Check the ductwork for leaks. Once you have fixed the problem, brush on two coats of stain blocker, prime and then paint. Whether you have to paint the entire ceiling will depend on how well you can match the paint.


2

If you want to run your rack/whatever in the other direction or in a specific location, you can screw 2x4s as needed flat against the ceiling and perpendicular to the red lines in MonkeyZeus' photo. Add a screw into every joist (green dots) (and there should be one right at the wall), and then you can screw your rack to those 2x4s (magenta oval). So you can ...


2

FWIW, I believe your ceiling joists actually run perpendicular to the long mud seams.The give-away for me is the screw pattern near the light and the orientation of the electrical outlet. To answer your actual question: The white stuff is drywall compound which covers the drywall seams and screw holes. The screw holes are a good indicator of where you can ...


2

What that needs is a good scrubbing with warm soapy water. If the paint comes off because it is old or because it is no longer durable enough to survive a good scrubbing... then it needed repainting anyway. Use a high quality gloss or semi-gloss paint if you do it.


1

You've done the right thing with the plaster as you stated. You sent a sample to a lab and had it tested. That is the only way to know for sure. We cannot tell you from a photo with certainty.


1

Green is indeed ground pretty much everywhere except old work in the Soviet Bloc. You need to attach the new light the same way the old light was attached. It is likely of the 4 wires from the wall, two of them were attached to each other and not to the lamp. Reconnect those same ones the same way. In wiring, colors don't mean a whole lot, becuase ...


1

The streaks are actually strips of "clean" or at least cleaner than the surroundings. Unless adjacent to a kitchen, or the room used by smokers the dirt is unlikely to have an oil component. Try the following: Hot water (as hot as you can stand with kitchen gloves on) and laundry detergent. This is generally good for the mix of dust and water that is ...


1

Likely too late to be of use to OP, but for others who may come looking. Look what's up there? Lath? Joists? Cut a nice rectangular wallboard patch larger than the hole. Trace its outline on the ceiling. Remove plaster within the outline so patch can fit in snugly. Ensure that opening is wide enough to access a joist to which box can now be affixed. ...


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