First Fix Carpentry: Setting the Foundation Right

First fix carpentry sets the foundation for everything that follows. Get it wrong and second fix becomes a nightmare. Here's what matters in first fix work.

What Is First Fix?

First fix happens before plastering. It includes:

• Stud walls and partitions
• Door linings and frames
• Floor joists and decking
• Roof timbers
• Window boards (sometimes)
• Noggins for fixtures

Getting Stud Walls Right

Stud walls need to be plumb, level, and properly spaced. Standard stud centres are 400mm or 600mm depending on the boarding. Noggins at mid-height add rigidity. Use a nail gun for speed, but check alignment constantly.

Door Linings

Door linings take more abuse than most first fix elements. They need to be:

• Plumb in both directions
• Square at the corners
• The right width for the wall thickness
• Securely fixed to withstand door slams

Thinking Ahead

First fix requires thinking about what comes later:

• Where will sockets and switches go? Add noggins.
• Where will heavy items hang? Add backing.
• How will services run? Leave routes clear.
• What flooring follows? Check levels.

Common First Fix Mistakes

• Not checking floor levels before setting out
• Forgetting noggins for radiators, towel rails, TVs
• Door linings too tight or too loose for the door
• Stud spacing that doesn't suit board sizes
• Ignoring moisture movement in new builds

Tools for First Fix

Essential first fix tools include:

• Circular saw or mitre saw for cutting studs
• Nail gun (framing nailer for studs, brad nailer for trims)
• Long spirit level and laser level
• Square and measuring tape
• Chalk line for setting out

Quality first fix makes everyone's job easier. Plasterers, electricians, and second fix carpenters all benefit when the structure is accurate and well-considered.