Spackle or caulk in gaps between plywood sheets

[Ölin]

We are installing pine plywood panels as a surface layer on the ceiling (untreated) but notice that it's hard to get them completely flush against each other. Does anyone know if it would work to fill the gaps with wood filler or if there is a better solution?

 

[Centano]

Isn't it intended that the boards should be mounted with room for movement?

 

[Ölin]

No idea? It's straight edges so they shouldn't be "clicked" together. Standard 10mm 1x2 m

 

[Huzzbutt]

Floor sealant provides movement allowance, expensive but works.

 

[Jonatan79]

Floor joint provides flexibility, expensive but works

Pictures ?

 

[Hans G2]

Milling tongue and groove on them will be the most attractive and best option, but it also requires a bit of work. Filler won't last over time. I don't believe soft caulk will work either if you want them flush.

 

[Markokoistinen]

Cut in a groove and tongue!
That way you get wood even in the joint.

 

[Stefan N]

Putty and sealant will not hold; an alternative is to install trims like in the old days over all the joints.

 

[Ölin]

This is how it looks. It's a maximum of 3-4mm, so shouldn't it still work with putty?

 

[Hans G2]

Here's how it looks. It's only about 3-4mm, so shouldn't it work with filler?

Wood is a living material, the gap size will vary over the year, so the filler will crack. If you're going to use something, it should be an elastic sealant, but routing will look 1000 times better.
Think of a plasterboard, it's a dead material but still cracks if you don't lay tape in the joints, in this case, you have a living material without tape.

 

[Jonatan79]

Try to avoid unnecessary seams, why are you using such small pieces?

 

[Ölin]

Thank you for all the input. I don't know why we went with small pieces. Maybe because the ceiling is 3.5 meters high and it would have been insanely difficult with heavier boards. But now I've decided to put moldings along all the seams. I think it could be cool.

 

[Krickolina]

Thanks for all the input. Not sure why we used small pieces. Maybe because it's 3.5 m in ceiling height and it would have been incredibly difficult with heavier sheets. But now I've decided to put trim along all the seams. I think it could look cool.

Hi, I'm facing the same problem now that we're installing interior plywood in birch. Can you describe how you did it and preferably with pictures?