HELP! Severe bump/separation in hardwood

Old 03-07-14, 07:05 PM
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HELP! Severe bump/separation in hardwood

Hello everyone,

I'm new to the site and hardwood flooring in general. Over the past few days, we started to notice a small bump in our hardwood flooring. Since this morning, the bump has expanded significantly and is now pulling our boards apart. It's in an odd spot, though -- right in the middle of the house, and not near any plumbing lines that we're aware of (all bathrooms/showers are on the other side of the house). Also, we have a raised foundation, so we don't think it's an underground water issue.

However, we have had some pretty significant rain during the past few weeks. Not sure if this is the culprit or just a coincidence. Attached are pictures.

Anyone have any guesses as to what's going on?

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Old 03-08-14, 04:32 AM
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Welcome to the forums!

Is the wood damp at all? can you push the offending board back down?
Old 03-08-14, 04:53 AM
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Have you looked in the crawl space under your house? You may have water or damp ground raising the humidity which the floor is absorbing from below, causing it to expand.

What type of floor is it and how long ago was it installed? It looks like a traditional solid wood tongue and groove.
Old 03-08-14, 01:44 PM
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Look at either parallel walls and see if expansion gaps are present. If not, cutting a relief gap against the wall under the base and shoe should help the problem. If it is center of the room, most likely the floor was put down all in one direction. For large room I like to start in the middle and work out in both directions using a spline to change direction. This causes the amount of expansion to be halved as they will push in opposite directions from the middle of the room.

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