[DannyT]

is this for a kitchen? I wouldnt think oak would be the best choice for a kitchen counter.
the biscuits help align the pieces, they used to just glue and clamp before they had biscuits.

 

[screwy]

I agree. Since I am doing this as a favour I am not too concerned with the application but I am more interested in the process of joining multiple pieces of wood to produce a larger slab.

Basicly, would you just glue the pieces of wood together or use biscuits or another method?

Thanks

 

[Termite]

Biscuits aid in alignment but will not add much strength to an edge-glued joint.

I would strongly suggest using Titebond III or a similar waterproof glue. With proper glue application and correct clamping pressure, the glue joint will be stronger than the wood itself.

Oak is a poor choice for a countertop if food preparation will occur on it. The open grain will easily harbor bacteria and will be a real challenge to clean. Hopefully you're going to be using bar-top epoxy on it or something similar to seal it up as opposed to mineral oil butcher block finish.

 

[tcleve4911]

I am ready to glue the wood together and am wondering if I should be using biscuit? If so how many and what size?

Are you making this 3'x4' x 3" thick?

Biscuiting is for alignment. A solid glue joint (done properly)is stronger than a biscuit.
If you're going to biscuit, use a #20.

I would alternate your growth rings.