Timber vanity top

[Uncle Henry]

I've been asked to make a timber vanity top.
It's only 900 x 400.

Likely to be Blackbutt or Vic ash at this point.

I dont have an issue glueing and flattening the boards (router sled due to width).

My only concern is the nature of its use. They want the top to be 20 to 25mm thick but I'm a little concerned about warping or damage due to moisture.

Other than ensuring the top is well supported, is there anything else I should be aware of?
Is this thickness suitable? I dont want to make something thats isn't suitable.

Cheers

[artme]

I would be inclined to go for thicker timber.

[Uncle Henry]

I had made the same recommendation.
They didn't want to go thicker.

I declined to make it in the end. I wasn't confident in the longevity of the item given the thickness required, they were going to cut their own holes for taps etc and install themselves.
Too many variables for me to be confident it would last and I didn't want to have to re-make it in 6 months if it failed.

[david.elliott]

+1 for thicker...especially if it's a solid timber top...

I made a complete vanity many moons ago from Jarrah in the style of an old washstand and used the Thompsons water seal on all the timber not on show.. then a satin varnish on the rest. All good several years on