Undulations after sanding pine floors?

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Old 07-26-08, 05:47 AM
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Undulations after sanding pine floors?

I think something went wrong with the recent sanding of our floors (reclaimed 150 year old pine, milled 4 weeks ago from old logs into flooring) - there appear to be these regular lines/waves in them! They can't be felt with my hand but you can certainly see them. I actually noticed the lines on the freshly sanded floor but being a novice went ahead with sanding anyway. They only got worse. My contractor is being a jerk about it. Anyone have any idea what happened? I assume it has to be the sanding job but he is saying no. And the sanding guy is saying it is my fault, that is has to do with the stain. Any help or advice would be greatly appreciated!

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Old 07-26-08, 06:17 AM
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It looks to me like the drum sander was used incorrectly. If the sanding isn't done at a consitent rate more wood will be removed in some places than others. I suspect if you laid a straight edge on the floor, some areas will be tight against the straight edge while others will be slightly above. A 4' level will work for a straight edge although a longer straight edge would be better. Most 2x4s are not straight enough for this purpose.

btw - it's never a good idea to stop staining in the middle of a floor - you run the risk of a lap mark in the stain.
 
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