Figure 20.—Lashing purlins to principal rafters. 1, purlin; 2, rafter:

a, the braid is brought up with a transverse turn (3) around the purlin close to its outer edge; b, it passes diagonally over the back of the rafter to where its inner edge meets the purlin; c, the braid is continued transversely upwards over the inner surface of the purlin to form another transverse turn (4), parallel with the first turn (3) and separated from it by the width of the rafter; d, the braid crosses diagonally over the back of the rafter to its outer edge, where it reaches the starting point; e, the two previous turns over the purlin are repeated to form two pairs of transverse turns around it; f, the diagonal turns over the back of the rafter have also been repeated to get the braid into position; g, diagonal turns are now made over the purlin, commencing from the lower outer corner and running upwards to the upper inner corner; h, from the upper inner corner, the braid passes transversely across the back of the rafter to its outer edge; k, from the upper outer corner, the braid makes a diagonal turn downwards to the lower inner corner, crossing the first diagonal turn in the middle of the space defined by the transverse turns around the purlin; m, the braid makes a transverse turn across the back of the rafter to its outer edge where it is in the position (f) to repeat the diagonal turns; n, two more diagonal turns are made just below the previous ones and these are sufficient for the lashing. After making the last diagonal turn, the braid makes a circumferential turn around the lashing between the purlin and the rafter. p, The circumferential lashing (5) is shown in section passing between the two wooden elements and through its own loop which fixes the lashing. Another circumferential turn may be taken. The circumferential turns besides drawing the lashing additionally taut, prevents the outer transverse turns around the outer end of the purlin from slipping over the edge. The remainder of the working hank is usually left hanging to be used later in lashing the thatch rafters to the purlin. All the purlins are similarly lashed to all the rafters including the middle set.