Setting-Out: Stage 1
The first task is to establish the general line of the long side of the garage, parallel to and 1m away from the existing building. As shown in Fig 51, two pegs are positioned 1m (to the centre of each peg) from the side wall of the existing building – these first two pegs are only to establish the side wall line of the garage and need to be positioned away from the corners of the proposed new building.
When setting-out, all measurements are to the centre point of the peg in order to ensure the greatest accuracy at the point of intersection between ranging lines. After positioning and levelling the pegs, a clout nail is hammered into the top/ centre of each peg, projecting from the top of the peg by approximately 20mm, to allow the ranging line to be attached.
When measuring the distance from the wall, a builder’s square should be used to ensure that the measuring tape is being held at 90 degrees on plan to the wall. Failure to do this will result in a mismeasurement and the pegs will end up being too close to the wall. For the same reason, the tape must also be held horizontally. All setting-out must be carried out in a horizontal plane if correct dimensions are to be achieved. Accordingly, when a string-line is attached to the nail at the top/centre of every peg, it must also be horizontal, so the tops of all the setting-out pegs must be at the same level before hammering in the nail. Methods of transferring levels and ensuring that the tops of pegs are level as shown later in this chapter.
Having correctly positioned and levelled the pegs, hammer a clout nail into the top/centre of both pegs and attach a ranging line. As a secondary check, a line-level can be attached to the ranging line to ensure it is horizontal. Ranging lines must be kept tight at all times to ensure straightness and accuracy.
Set a temporary peg (‘T’) a distance of 2m from the front of the existing building to the centre of the peg (see Fig 51), then, using a ‘long-arm’ builder’s square, transfer the position of temporary peg ‘T’ to the ranging line and insert a peg (‘A’) under the ranging line. This is the first corner peg of the new garage. Temporary peg ‘T’ can now be removed.
From peg ‘A’, measure a distance of 5m and position peg ‘B’ (which is the second corner peg of the new garage) level with peg ‘A’. Line ‘A’-‘B’ represents the right-hand side wall of the new garage. Insert a clout nail into the top/centre of both pegs ‘A’ and ‘B’.