Constructing and Deconstructing Walls
From Unofficial Stationeers Wiki
Summary
Getting the basic structure for your base is usually the one of the first things you do. You will need a base to install your solar panels, solid fuel generator and get the battery charger hooked up to an APC to get power from the solar panels. You need frames to attach these structures too.
What you need
Iron Frames
Iron Frames are your basic building blocks. Iron walls can be used but they don't allow structures to be placed. Iron frames do not have to have iron sheets added on them to place structures. You can use the frame itself. The frame without sheets allows you to walk through it and place cables and pipes inside. Which you can seal up after to pass connections through rooms.
Iron Frames
Placed
One sheet added
Second sheet added completed
Constructing
Grab Iron Frames into active hand, use right-click to bring up place mode and left-click when frame is in desired spot.
Then equip a welder in one hand and Iron Sheets in the other hand, two per frame you wish to install. The welder needs to be the active hand.
Use the 'O' button to toggle the welder on.
Then aim at the frame of the Iron Frames and left click. The welder will go through a green progress bar adding one Iron Sheet from the inactive hand.
That completes one wall/ceiling/floor that you can place structures on.
Deconstructing
The frame is broken down in stages. First you remove the sheets using a wrench and then the angle grinder to take down the actual frame once all sheets are removed.
It is often needed to remove one layer of Iron Sheets so you can pass new cables through a wall. In which case on wrench is needed.