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Black film from furnace/AC

My walls and tv screen gets a black film on it. Could it be coming from the furnace. Just cleaned my bathroom tile above furnace vent and the wall had a black film on it.

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I would be concerned that exhaust is not venting properly and the soot is getting into the fresh air side of heater. Have unit checked for carbon monoxide presence in fresh air ducting. Heaters use a heat exchanger the is heated by the furnace and fresh air is blown through yje exchanger to be warmed before it gets out the vents. If the exchanger is damage or rusted through the good and bad ai can exchange creating a serious/ life threatening condition. I recommend professional inspect and repair and have a carbon monoxide detector in place and functioning. Be safe and good luck

Posted on May 21, 2009

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The tiles behind my wall hung geberit tiles are cracking and the toilet seems to be moving a little. Ian afraid it is going to pull out of the wall. It has been there for 10 years but is a spare washroom...


Never herd of wall tiles cracking. If you have access to the underside of the bathroom (via basement ceiling), you may want to check of the wall(s) has proper support for load or a non-supported floor plywood joint may have been installed the wrong way/not supported properly. You should be able to see the nails coming through the floor plywood where the wall(s) is located above. You may have to add blocking and/or brace(s) with joist hangers for support as required. Interior wall studs may also been spaced at 24"c/c instead of 16"c/c if the wall tiles were not installed by the builder not accounting for heavier than normal load.

If by chance the washroom is in the basement::
  • Non-load bearing walls (interior non-loading will be supported by the slab.
  • Load bearing walls will be supported by footing foundations
As for your toilet moving: the wax gasket may need replacing if not seated properly (rocking). If it just seems a bit loose, try to just tighten the flange bolts on both sides of the bottom of the toilet after removing caps. If no spacers are present between the bolts and the ceramic, they need to be there to not crack the base or reduce the chance of over-tightening that would do the same. There may be water coming from a shower that's close by or from the sweating of the tank in the humid summer months.

If the ceiling are closed for access below, you have the choice of tackling the job from within the bathroom by removing the some of the plywood floor to inspect the problem OR by the ceiling below. I would should the ceiling below if it was me.

Good Luck!

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First clean floor down to plywood. Then buy mastic, notched trowel and tile spacers from hardware store. Lay out tile in the pattern you want by cutting them with a tile saw you rented. take out dry laid tile and mastic a small area and install til making sure you press the tile into mastic. Insert spacer and install next tile.

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Should i use the same drywall in the bathroom as in the rest of the house?


I recommend using MR (Moisture Resistant) drywall for the bathroom, and possibly for the basement if there are moisture issues. It is not much more expensive, and it can save you a big headache later

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As per my view, before applying anything to your bathroom walls, you should take some advices and tips from a professional as they have the proper idea about such quires.

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There are a couple of designs, one is surface mount and the other is recessed. Surface mount mounts with silicone (hard to imagine it would last) and the other installed similar to a tile, but using grout. The grout install gets a hole cut in the tiles, goop everything up with grout, and goosh it into the wall, clean same as you would when working with grout.

Both designs need support until the adhesive dries.

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1 Answer

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contact Daltile to see if they have a replacement. If they do you will have to have contractor purchase for you as Daltile does not sell to general public

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The consensus here is a medium to pale/light blue - black or dark blue would blend better, but it would be one darn dark bathroom. You want something that blends, not accentuates the purple.

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