Xbox, solo, 0.5.0.

The game will not allow me to place a clay/pebblet foundation next to an already built foundation. I can place one on top of another foundation or by itself, not attached to another foundation.

 

Hmm. That is strange, considering that you do have some foundations side by side. Can you please submit a support request so that we can properly record and investigate this issue? 

1. Platform (Xbox Console, PC Game Pass, PC Steam). 
2. Multiplayer or Single Player Game (if multiplayer, can you let us know how many players in total in the game and their platforms if you know this) 
3. Description of issue. 
4. Last thing you did in the game before the issue occurred, if applicable.

Thanks!

Submitted a support request. The existing clay foundations you see in the image were built prior to the 0.5.0 update.

Tenta colocar uma embaixo ja de outra construída ao lado que nao consegue e depois tentar colocar onde nao consegue.
 

I am having the same issue building a new outpost base in 0.5.   Within the first image there are four gaps in the intended 4x5 structure (pebble foundations used).  The second image shows that despite snapping to the edges of the previous foundation lines, it will not allow placement.  The same is true for the other three gaps seen in the image, and it will not allow me to place a foundation anywhere on the left side if I wanted to expand to 5x5.  This is a single player game on PC.  The location is on the rock right of the rock containing the juice box container near the pond.  The last thing I did was run to my other base to get supplies to construct the foundations once placed.

You can put clay foundations under the ground then put the pebblet ones on top of them. Then after you build them you can use the debug menu to get rid of the blueprints under the ground.

If this is the stone next to the raspberry punch the best way to get the most foundations on that rock is start on the south edge in the middle so you are not too low or too high off the ground.  I have a full 8 x 12 here with shorter sections attached as you follow the curve of the rock. You will need to place some foundations into the rock below the visible surface but they can be removed with the blueprint removal debug.

I have the same issue and I tried building in several different locations.  I also tried building at different heights to make sure all of the foundation pieces were touching the ground.  I eventually found a location where I could build enough foundation for a small house but the corner is missing out of it.  It is very frustrating.