How To Work Out The Gauge On A Slate Roof

Rounded up this becomes 13 then divide this into the original measurement 246 15mm.

How to work out the gauge on a slate roof.

Holing gauge mm battening gauge mm m batten per m2. Batten gauge length of slate headlap 2. 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.

Finally divide the measured distance between the battens by the rounded number you now have the gauge that your roof requires. Total linear run of tile batten in metres. Therefore if your rafter length was 4 linear meters your calculation would be 4 x 2 5 10 quantity slate half s. Height of slate minus desired headlap divided by two gauge i e.

Holing gauge batten gauge headlap 10mm. Measurement between battens 3 2m manufacturers gauge 260mm so total recommended gauges required 12 31. Tile batten gauge for slate. The holing gauge can be calculated as.

X the nail hole clearance so that a nail does not strike the top of the slate underneath. The result is the number of courses of tile on the roof rounded to a whole number. As a guide a slate of 500 x 250 sizes uses a slate and half of 500 x 375. Holing gauge for holing slates.

Slate length mm battening gauge mm m batten per m2. The most commonly used slate size in southern england is 500x250mm and 400x250mm in scotland and the north of england. This calculator will estimate the following number of slates required per square metre. Divide the distance by the maximum gauge of the tiles being used and round the result up to the next largest whole number.

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. The gauge is in fact the same as the margin which is the length of the slate exposed. Holing gauge mm battening gauge mm m batten per m2. Now we can work out the holing gauge with gauge headlap x.

Measure the distance from the top of the lowest batten to the top of the highest batten. 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. For a 500mm long slate with a 100mm headlap the gauge is 500 100 400 2 200 so we know the gauge is 200mm.