Concrete tiles which are usually lighter than clay tiles can easily place over 10 pounds of weight per square foot on a roof.
Setting out concrete roof tiles.
Having settled on an arrangement the battens should be marked every third or fifth joint.
3 2 setting out for tiling 61 3 3 loading of the tiles on to the roof 61 3 4 laying of tiles 62 3 5 eaves 63 3 6 valleys 64 3 7 ridges 66 3 8 hips 68 3 9 verges 69 3 10 abutments and flashings 71 3 11 inspection after tiling 75 ii.
Start tiling by loose laying a row at the eaves in order to establish the spacing between tiles to get a whole number to minimise cutting to make any adjustment you can use a tile and a half at one end or adjust the side gaps between tiles to achieve a suitable fit for a whole number of tiles.
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.
Interlocking clay tiles require more sorting and care when setting out and laying than interlocking concrete tiles.
The results are well worth the extra effort.
If the pitch of the rafter is below 30ยบ check that the tile used is suitable for the pitch.
Consider the impact of weight.
In january 1987 the roof tile committee of the frsa ntrma was commissioned to develop and write consensus guidelines for the installation of concrete and clay roof tiles.
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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.
Just short of the centre of the gutter.
Make sure the tile lugs are seated snuggly onto the top edges of the battens.
To put it in simplest terms a basic asphalt shingle perhaps the most common roofing material in america will typically place a weight of less than 3 pounds per square foot on a roof.
Next place your two tiles one on top of the other loose onto the battens without anything being fixed.
Recently the national tile roofing manufacturers association ntrma changed its name to tile roofing institute.