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My basement is unfinished and I have a large concrete wall. Can (should) I drill some small holes in the concrete to hold up a mirror or two?

Are there any serious downsides to drilling into the wall an inch or so?

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    Another option is to attach some 2x2 boards to the floor joists so that your 2x2s are flush with your wall. Then hang your mirror on them. You will see them extending up from the top of your mirror but that is not so bad. – Willk Jan 2 at 21:07
  • @Willk excellent idea - there may be other things to hang later, so adding some framing is much more flexible. Plus you know that the wood is hung with dynabolts or other suitable concrete anchors, not nails or screws. – Criggie Jan 2 at 22:33
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Shouldn't be a problem at all - look in your local hardware store for masonry bits and concrete wall anchors.

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    This. Make sure you use a masonry bit to do your drilling, or else you'll have a bad time. – Tristan Jan 2 at 17:49
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    If you can, borrow a hammer drill, it will take a few seconds to drill each hole. Dipping the bit in a cup of water every few seconds or so can help keep it cool and speed up the work. – JimmyJames Jan 2 at 17:59
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    @JimmyJames comment is good. I go a step further by recommending a rotary hammer over a hammer drill. Any model with an SDS+ shank will probably do. You basically hold the tool in the right direction and the hole virtually drills itself. A word of warning though: Having used a rotary hammer once, I can say from experience, it is highly addictive and leads to buying a rotary hammer which is a slippery slope to drilling many more holes. – Hermann Jan 2 at 20:57
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    If you do go with the hammer/rotary, wear a dust mask and eye protection. Concrete dust can shoot right in your face in a plume. – JimmyJames Jan 2 at 21:29
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    @Hermann obligatory xkcd – JFL Jan 3 at 9:24
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Done exactly this last week. Have a basement with concrete walls and tiles installed on them.

I used tapcon screws. They came with a proper size concrete drill-bit for the screws.

Started off by marking where screws would go with a pencil. Then drilled very small pilot hole using smallest drill-bit I had. Having it made the tapcon drill-bit stay in place instead of sliding on tiles. Screws went in the hole tightly and hold mounts securely

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It depends, if the basement is a prebuilt tub like construction it might void your warranty. I would check with your construction company.

  • Huh? Unless this is a brand new home, there wouldn't be a warranty on the basement walls. A typical "Home Warranty" on an older house includes major systems & appliances, not (as far as I know) wall issues. In any case, a few masonry anchors for a mirror should not cause any problems. – manassehkatz Jan 2 at 20:58
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    Don't know the country, but here in the Netherlands houses(~10 years or newer) that have a basement are mostly prebuilt and can have a warranty up to 50 years. Drilling in them will void the warranty as it can cause cracks and water to seek in. As I said, best to contact the construction company. – yekurtal Jan 2 at 21:03
  • Wow! Nothing like that in the US, that I know of. – manassehkatz Jan 2 at 21:06
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    @yekurtal Consider adding your comment into the answer. As a person who does not live in the Netherlands, I did not understand your answer until reading the comment. – Roijan Eskor Jan 2 at 22:15
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    @manassehkatz More than 50% of the land area of the Netherlands is less than 5 meters (15 feet) above sea level. The level of the water table is important if your house has a basement! – alephzero Jan 2 at 22:59

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