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Laying down the battens.
In principle the roofer always tries to finish with a whole tile at the ridge.
To do this, final rafter length may be determined on site. This first course is crucial, position the batten allowing the tile adequate overhang into the centre of the gutter in order to begin and finish with a complete row. n the case of renovation and when the roof timbers already exist, it is sometimes inevitable that the last row will have to be cut.
However if the job allows it is best to choose tiles with a variable exposed length (variable gauge). By being able to adjust the length of the exposed surface of each tile it is always possible to end with a full tile : this saves time and costs plus gives added strength at the ridge.
To do this, final rafter length may be determined on site. This first course is crucial, position the batten allowing the tile adequate overhang into the centre of the gutter in order to begin and finish with a complete row. n the case of renovation and when the roof timbers already exist, it is sometimes inevitable that the last row will have to be cut.
However if the job allows it is best to choose tiles with a variable exposed length (variable gauge). By being able to adjust the length of the exposed surface of each tile it is always possible to end with a full tile : this saves time and costs plus gives added strength at the ridge.
Planning your battening
1/ definition of (variable gauge):
The "gauge" is the visible part of a tile on the roof and is also the part which is directly in contact with the elements.
The gauge corresponds to the gap between the battens/laths measured from top edge to top edge. The manufacturer usually indicates the theoretic gauge which enables you to work out the length of battens needed to complete the roof.
2/ to determine the average gauge:
The roofer selects at random a minimum of 10 tiles from the delivery. He places them upside down on a flat surface interlocking them and making sure that they are spread to their maximum length measuring the distance between the 1st and the 10 th tile. The tiles are then pushed (butted) together into a position of minimum spread and the distance measured between 1st and last tile. These two distances are then added together and divided by 10 to establish the average gauge.
P = L + « 1 »
20
P = 360 + 345, soit 35,25 cm L = 360 cm
20 « 1 » = 345 cm
The "gauge" is the visible part of a tile on the roof and is also the part which is directly in contact with the elements.
The gauge corresponds to the gap between the battens/laths measured from top edge to top edge. The manufacturer usually indicates the theoretic gauge which enables you to work out the length of battens needed to complete the roof.
2/ to determine the average gauge:
The roofer selects at random a minimum of 10 tiles from the delivery. He places them upside down on a flat surface interlocking them and making sure that they are spread to their maximum length measuring the distance between the 1st and the 10 th tile. The tiles are then pushed (butted) together into a position of minimum spread and the distance measured between 1st and last tile. These two distances are then added together and divided by 10 to establish the average gauge.
P = L + « 1 »
20
P = Pureau
L =maximum length
« 1 » =minimum length
20 = 10 maxi pureau + 10 mini gauge
P = 360 + 345, soit 35,25 cm L = 360 cm
20 « 1 » = 345 cm
This formula will establish the nominal batten gauge required. Always refer the manufactures brochure for technical guidance or contact the Imerys technical department.
