Guidance on the installation of underlay and tile battens is given in section 7.
First row of roof tiles.
Setting out up the roof gauge set the first batten at eaves to allow the tails of the eaves course tiles to overhang the fascia by 40 to 45mm ie.
Set out the first second and all the rest of slates on a pitched roof.
Just short of the centre of the gutter.
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The lowest row of tiles at the fascia board is made up of shorter tiles to provide the double lap for the first row of full ones the lower edges of these short tiles and the first row of full tiles should be the same.
Lay the first row of shingles directly covering the narrow starter row.
As you roll out the underlay keep the bottom edge of the material aligned with the edge of the eave but above any metal or synthetic edging that may cover the borders of the eave.
Cut six inches off the length of the first starter shingle nailed on then use the rest of them full size.
Next place your two tiles one on top of the other loose onto the battens without anything being fixed.
Firstly get two of your roof tiles and either two full battens or two offcuts of batten and place them onto the roof one above the other.
The height distance up the roof of the starter slate must be at least 3 inches greater than the vertical exposure on the first course of slate.
Underlay and tile battens.
Shifting them in this way will join the ends of the first regular row of shingles placed over the starter shingles.
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Position the first roll of underlayment at one side of the roof perpendicular to the lower edge the eave of the roof.
Although house models from indus valley civilization show that the houses were flat roofed harappan sites such as alamgirpur dated 2600 2200 bce provide evidence of roof tiles.
The exposure on the first course of slates may be reduced by dropping the chalk line for the top of the second course of slates in order to increase the headlap on the starter course.
Make sure the tile lugs are seated snuggly onto the top edges of the battens.
Snap a horizontal chalk line over the starting row to use as a guide.