This is due to the updraft of air currents created by the heat of the light bulb. Often homeowners will report dark circular spots above vanity lights. Ghosting can produce other unusual results. Increase the insulation and reduce the humidity. The solution is the same as with regular ghosting. Notice how there’s no mold growth where the framing lines up with the ceiling. These rectangular areas of growth line up with the framing in the ceiling cavity. Notice the angular pattern of the mold in the image below. In some situations, the same conditions that cause ghosting can lead to mold growth. The temperature differences are due to missing insulation (warmer in this case because the inspection was performed in the summer). Notice how the colored spots in the thermal imaging on the left match the discolored ceiling on the right. Thermal imaging cameras are excellent at detecting the missing insulation that leads to ghosting. Insulation is missing in this section, leading to a decrease in temperatures and condensation. Notice how the grey, discolored area matches the exact width of the attic rafters. The photo below is an example of this scenario. We just don't use them.While ghosting often mirrors the attic framing/rafters, it can also occur due to missing insulation. *You're not expected to have ever seen a wire nut in the UK. There's a difference between 'technically safe' & 'murphy's law safe' ) I'd put them in a piece of terminal block & tape that up, just so it can't get knocked. Otherwise just wrap the bundle in tape.Īs the OP has mentioned in comments that they want the power back on for a week before the plasterer arrives, then… you're asking for trouble with them just taped. If there's any chance, no matter how remote, that someone would possibly think it a good idea to switch the power back on… then tape them individually, then all together. The tape around the wires is for your convenience not his - when he's finished you can take the tape off again & still have clean cables, for when you re-fix the light fittings.Īs to whether you tape each individual wire in each cable - that's really a matter of where you put the removed fuse/RCD once the fixtures are out. He'll let you know if he's not happy with that )Īll he needs is for you to switch off the power at the fuse box/RCD so there is no live mains where he needs to work. If you do have back boxes, tape up the cables & stuff a carrier bag in the box with some extra tape, so the boxes don't get filled with plaster. I don't imagine these light fittings have back boxes, they just fasten to the wall, where there are cables coming out from behind the existing plasterwork, buried in the walls. The cables will have to stay in situ & he'll have to work round them. He wants the light fittings out of his way because he needs to be able to work under where they usually sit. You won't have to worry about chipping plaster off the already stripped ends of wires, potentially damaging the insulation in the process and needing to cut & restrip wires which could leave you without enough wire to reattach the devices. When you're done, pulling off the tape leaves you with a clean box and clean wires. It might clog up the device mounting holes, or there could be enough that devices won't fit in the boxes without having to chip it out. While plaster in the box isn't a safety item, it can make your life more difficult because you may have to chip the dried plaster out to get wires to move where you need them to. To protect the wiring and boxes, I'd use some painters tape (or even duck tape) to cover over each box to keep stray plaster out. This will help protect workers should someone accidentally turn on a breaker. An added safety measure would be to put a wire nut (or Wago™-style lever-locking terminal, screw terminal, or other common wire connecting/insulating device) on each individual wire (make sure you get a batch of wire nuts of the correct size for the individual wires you'll be capping). If the breakers are off and stay off, there won't be any live wires for the workers to touch, so they'll be safe. Having seen the impact that plaster and paint jobs can have on wiring, I'd be more concerned about protecting the wires from the workers!
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