Sawing and Drying

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ceiling boards swelling before timber frame is dried in

5/30/20       
dave Member

I have 2x10 ceiling boards over purlins spaced about 3 feet apart. I was a little worried that I might have over dried them. I don't trust my moisture meter much. Had a friend bring his and it said 15 percent. So i installed them real tight. Now 2 weeks later they are even tighter and some pulling up even though installed with 4 and 5 inch GRK 5/16. His meter must not work either. I was planning on pulling up roof paper and running saw blade between them. I was going to set the blade to leave maybe 1/8 of an inch at the bottom to keep a nice appearance from the exposed under side and hope that that small amount of material left can compress if needed. that will be at least a week of work for me probably . A friend is trying to convince me to cover with plastic until the panels arrive and put dehumidifiers in. I am concerned that maybe i got the boards even drier than typical interior air anyway and think the safest bet may be to cut all the seams. So one question is how long should I think it would take for yellow pine with 2 coats of polyurethane all sides except the cut ends to acclimate. Should I think it may be acclimated now or will it keep swelling for weeks and weeks. I though the polly would keep it from swelling until it was conditioned. also I think it might be hard to get the humidity down quickly even with several home dehumidifiers because of the green timbers. Thanks for any ideas.

5/30/20       #3: ceiling boards swelling before timb ...
rich c.

Why did you put up the ceiling boards so soon? The interior is open to the outside? Personally I would take the stock down and wait till the place is dried in. I can't imagine doing a good job over my head with a skilsaw at every seam. If the boards are pulling away, it shouldn't be a big deal to bring them down. Poly just delays the moisture exchange, it doesn't stop it. Plus it sounds like you have no idea what the moisture level is anyway.

5/31/20       #5: ceiling boards swelling before timb ...
GeneWengert-WoodDoc

15%MC is possible but unlikely. If they were stored outside protected from the rain, 13% is more likely and if stored in a garage or building 11% MC. But it sounds like they were kiln dried, so would be drier.

Appreciate that a 10” wide pine piece will swell 1% for a 4% increase in moisture. So, that is about 1/32” for a 1% MC increase. So, you need to get the right MC, and then maintain that !C prior to installation. Even then, you can expect a 3% change, summer to winter. For that reason, we would suggest that you use tongue and grove with a long enough tongue to accommodate winter swelling and a slight gap exposing the tongue during installation. There are a few other ways to accommodate the movement too.


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