Splicing 120mm x 120mm post in the middle?

I need some expert advice guys, I have a 16ft post going from ground to roof. About 8ft up theres a decking so the beams are notched into the post. The problem is the pine is untreated so the rot has got really bad up around the 8ft mark. So whats the best way of fixing this. I can't get a new post because its too big, would cost too much. I was thinking of cutting out the rotted section and splicing a new post in? maybe using a half lap join? Because its in the middle of the timber it would have a half lap join maybe 300mm then solid section 4-500mm then another half lap join 300mm. Then use 2 bolts in each of the half lap joins? Does this sound safe? Or the right method?

I will also need to make a recess in the 500mm solid section for the beam to sit into?

Any advice guys would be much appreciated? Thanks

Sorry I forgot to mention. The post has been machine turned but thankfully the ornate part is at the top and bottom. No where near the piece I'm thinking of joining in...

Little bit smaller but treated for outdoor and structural, job done as one piece.
http://www.bunnings.com.au/pine-post...nated_p8401290

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Originally Posted by Wrongwayfirst

Little bit smaller but treated for outdoor and structural, job done as one piece.
http://www.bunnings.com.au/pine-post...nated_p8401290

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Thanks but replacing the whole piece is not an option. The posts are ornate have been machine turned like 20 years ago, would never find a match (thats cost effective) and it has to match in with the other 5 posts.

Do you think my method listed above is feasible?

Well if the ends are machine turned posts I will assume they were not done on a 5Mtr lathe.:U So have a close look at the other posts, there may be remnants of a join. Check also around the half way point, the deck area, maybe sand back to bare timber (I assume you will need to paint the new post anyway) might show up a join to compare. they could have also made the original join with an 80mm dowel in the centre of the post to hide the join too.

OR

http://www.craftsmanspace.com/knowle...ng-joints.html

scarf joints increase the timber to timber face which means more glue surface area and stronger joint, basically a variation on a half lap, consider the dovetail scarf with bolts. Liquid nails "original" should add strength.

apart from that when the longest timber is unavailable or cost prohibitive joining timber will provide an economical solution just not the same strength,
cheers