How To Work Out The Gauge On A Slate Roof

As a guide a slate of 500 x 250 sizes uses a slate and half of 500 x 375.

How to work out the gauge on a slate roof.

Divide the distance by the maximum gauge of the tiles being used and round the result up to the next largest whole number. Slate length mm battening gauge mm m batten per m2. Height of slate minus desired headlap divided by two gauge i e. Please enter the dimensions in the white fields below and click calculate to show the results.

Holing gauge mm battening gauge mm m batten per m2. Holing gauge for holing slates. X the nail hole clearance so that a nail does not strike the top of the slate underneath. You can assess this in two ways either as the roof pitch angles which the rafters make with the horizontal or the proportion between the run and the rise of the roof.

Therefore if your rafter length was 4 linear meters your calculation would be 4 x 2 5 10 quantity slate half s. Often you express roof pitch as the ratio between the rise and the run in the form of x 12. Finally divide the measured distance between the battens by the rounded number you now have the gauge that your roof requires. Holing gauge batten gauge headlap 10mm.

Holing gauge mm battening gauge mm m batten per m2. Measure the distance from the top of the lowest batten to the top of the highest batten. Total linear run of tile batten in metres. You would need 2 5 of these slate per linear metre.

The supplier of the slates should recommend the spacing up the roof between the battens known as the gauge this usually varies according to the size of the slates the pitch of the roof and the degree of exposure. Rounded up this becomes 13 then divide this into the original measurement 246 15mm. Now we can work out the holing gauge with gauge headlap x. The most commonly used slate size in southern england is 500x250mm and 400x250mm in scotland and the north of england.

Measurement between battens 3 2m manufacturers gauge 260mm so total recommended gauges required 12 31. Batten gauge length of slate headlap 2. The result is the number of courses of tile on the roof rounded to a whole number. Roof pitch refers to the slope which the rafter creates.

The best place being 3 5mm as this gives the best resistance to wind uplift so for our example we will work with 4mm although it can be as high as. This calculator will estimate the following number of slates required per square metre. Tile batten gauge for slate.