Hello,
I'm installing a 22' LVL on the 1st level of my home and I need to support the 6"x8" posts I bought with bases.

The 2 bases for the 1st floor posts just need to be nail-on type, but I will probably still need them sized for 6"x8" posts.

The 2 bases for the basement need to be mounted with a bolt into the concrete.

I have checked the Simpson catalog, and I couldnt find any bases for 6"x8" posts, does anyone know of another source?

Thanks,

Rick

To understand what you’re doing is that you’re removing some sort of wall upstairs. Then with posts and LVL taking the load down through the floor into the basement where the load is going to sit on the cement floor? If that is correct have you cut the cement floor and put new footings in yet? If not I suggest you do so next. Cement floors are NOT structural and will settle and crack over time. If you have done this great, then as you know you need to attach the wood posts to the cement floor so they do not move. Which is what you’re trying to do now?

The wood as you realize cannot be placed directly onto the cement for fear of decay. Which is what the metal mounting posts are used for. To separate the wood from direct contact from the cement and to hold them into place. You cannot use this type of metal support on something like this, as based on the size your speaking of. The load would be much to great for a simple Simpson tie to support.

You could have a metal ones made out of 1/4 inch steel, but lots of money for one or two brackets.

I would suggest that you use a lolly column filled with cement to support this load in the basement. Then simply cover over with pine box to make it look nice if its in a finished exposed area. I would also use a steel lolly column in the walls upstairs as well. This prevents any shrinkage of the length of the posts which will cause settlement of the supported areas above. May cost a whole lot less as well.

The metal posts will come with plates that can be welded if its required. And prevents the need for these little metal brackets you’re not going to find.

I found one on the Simpson site that will work. This one is for a 6x6 but the base is open on two sides allowing for a wider post. When you install this make sure the bottom rests on the concrete....the weight of the post will rest on top of the bolt. Those bolts can hold tons of weight and you won't be relying on the standard stand off post base.

Simpson post base.

You can buy all the plates and connectors you want, but you could have a big problem.

Do you really know how thick the concrete slab is? - You could end up punching a hole in the slab around the posts or creating more cracks. Many basement floors are 3 5/8" thick at the maximum and may be thinner elsewhere. If the soil is not compacted properly or has settled there could be a void under the slab.

the normal construction is to pour a concrete footing under a column (concentrated load). How do you think you can get a permit if you try to get one to protect you from yourself.

The fact that they are 6x8 indicates a substantial load can be expected.