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MrLyn
Seal both sides of butcher block?
MrLyn

Is it necessary to seal both sides of unfinished butcher block so that moisture won't warp it over time? I plan to stain the top and apply polyurethane. Do I need poly on the underside as well?
And is one screw in the middle enough to keep the edges from warping up?

A. Spruce
Re: Seal both sides of butcher block?
A. Spruce

Not near enough info to provide a coherent answer. How large is the BB top? What will it be used for?

dj1
Re: Seal both sides of butcher block?
dj1

Seal all 6 sides.

Without knowing the size: one screw is usually not enough.

MrLyn
Re: Seal both sides of butcher block?
MrLyn

The size is 26 x 56, and 1" thick. It will be a top for a divider between the kitchen and den and won't be used as a food surface. Thanks for the help.

A. Spruce
Re: Seal both sides of butcher block?
A. Spruce

As a non-food surface, poly will be fine. As DJ suggests, finishing all edges and both sides is a good idea, it will be more stable this way, and, if you can view from underneath, will complete the finished look. Basically, anything that is exposed should be finished.

As for fastening, wood is a breathing organism, it will expand, contract, and warp with changes in heat and humidity, even with a good finish on it, and particularly at only 1" thickness. You should install fasteners as close to the perimeter as possible, all the way around. I'd recommend two to three across each end and 4 to 5 on each side.

MrLyn
Re: Seal both sides of butcher block?
MrLyn
A. Spruce wrote:

As a non-food surface, poly will be fine. As DJ suggests, finishing all edges and both sides is a good idea, it will be more stable this way, and, if you can view from underneath, will complete the finished look. Basically, anything that is exposed should be finished.

As for fastening, wood is a breathing organism, it will expand, contract, and warp with changes in heat and humidity, even with a good finish on it, and particularly at only 1" thickness. You should install fasteners as close to the perimeter as possible, all the way around. I'd recommend two to three across each end and 4 to 5 on each side.

Thank you, A.Spruce! Exactly what I needed to know.

Benjamin
Re: Seal both sides of butcher block?
Benjamin

I agree with spruce but would like to add that you need to allow for expansion and contraction. I do this by drilling a large hole in what ever you are mounting the top to and then using a screw and large fender washer so that screw can allow the top to move but it still holds it flat.

Benjamin
Re: Seal both sides of butcher block?
Benjamin

I agree with spruce but would like to add that you need to allow for expansion and contraction. I do this by drilling a large hole in what ever you are mounting the top to and then using a screw and large fender washer so that screw can allow the top to move but it still holds it flat.

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