Reccomended sealant 1

[WARose]

I have a situation where I have a (wood) post that is cast into a slab in sort of a pocket. I want to keep the slab isolated from the wood column on those sides. I've typically used a metal insert for this application in the past.....but here the client doesn't want one. I've thought about using something like a isolation joint.....but I don't know how good a lot of them are as far as mositure protection goes. Can anyone recommend a product? I see some on the net....but I like recommendations.

 

[jayrod12]

Interior exposure? Why not just wrap the post in poly?

Exterior exposure? Find a better detail. That post will 100% rot out extremely quickly. If you were to successfully protect the wood from the concrete, you'd essentially be creating a tub for the post to sit in water all the time.

 

[oldestguy]

Consider setting a galvanized pipe in the concrete, then set the post on the pipe via a hole drilled so there is a tight fit. If possible use a treated post or at least thoroughly so treat the exposed ends. I suppose this is your "metal insert". Of course one can do what the owner wants, but be sure he is warned in writing. Any sealing will be obvious and likely not permanent and questionable to begin with.

 

[MikeHalloran]

A pocket with a drain should work better, or less badly, than a blind pocket.

The drain should probably end in a large screened area, to mitigate against mud daubers and such.



Mike Halloran
Pembroke Pines, FL, USA

 

[Whoopdedo_LSU]

You need a barrier. Period. Wood is not going to cut it in the hole unless its sealed. I would think about using BASF or SIKA epoxy grout to embed the post. No moisture is going to penetrate that.

 

[dik]

Have you looked at Simpson's CPT66Z POST BASE, and I'd use PWF treated wood.

Dik

 

[dik]

What I did at Eganridge was to use a 1/2 steel plate the size of the post and a 3/4"hole with a rod welded to it and a hole drilled in the end of the post and the other end of the rod, embedded in concrete... no uplift, and, still standing.

The plate kept the wood from being in contact with the concrete and HDG assembly.

Dik

 

[dik]

Something like...

The original post was 10x10...

Dik

 

[WARose]

Thanks for the advise all.

 

[Whoopdedo_LSU]

dik,

The wood will still be in contact with the cement. There will be moisture there seeping in. You have to seal that. Cement grout will not do that.

 

[dik]

The wood will still be in contact with the cement

It's separated from the concrete by 1/2" steel and welded assembly is HDG...

Dik

 

[dhengr]

I’ve used Dik’s detail before and think it works fine. I would make the base pl. a little thicker, .75” or 1” to lift the wood a bit further off the conc. and out of the splash zone. I would also make the base pl. .5” on a side smaller than the wood col. size to minimize water from flowing (wicking) down and into the joint btwn. the stl. and wood. The base pl. can be dapped up into the bot. of the wood col. a bit to protect that horiz. surface; a drip edge can be routed onto the col. end; a sht. metal drip edge can be applied.