How much batten do you need for a slate roof?

In most cases, irrespective of rafter spacings, 50 x 25mm battens should be used for our standard preholed fibre cement slates. Where BS 5534 suggests 38 x 25mm battens are acceptable, the slates should only be laid with 100 or 110mm lap.

How do you work out batten spacing for slates?

Measure between the top of the top batten and the top of the lower batten and this divide this measurement by the manufacture’s ‘gauge’ – this will give the number of slates/tiles rows need to cover the roof. This number is very unlikely to be a whole number, so round the number up to the next whole number.

How is batten gauge calculated?

1 Measure distance between top of eaves batten and top of ridge batten. 2 Divide distance by maximum gauge of tile being used. 3 Round figure up to give number of courses up slope as a whole number. 4 Divide measured distance by number of courses to give batten gauge.

How do I work out how many roof battens I need?

The total length of battens you need for a roof depends on the number of rows of tiles.

1. Measure the length of the eave, or the bottom edge that hangs out over the home, for each section of the roof.
2. Multiply the number of rows on each section by the length of the eave of that section.

What is the minimum pitch of a slate roof?

25°
Natural Slate: The general recommendation for the minimum pitch for natural slate is 25°. There are some manufacturers that can go slightly lower, such as the SIGA 56M Natural slate, which can go down to 20° in some instances if used with slate hook systems.

What pitch can slate go down to?

20°
Because of this, the general recommendation for slate is a 20° pitch angle. There are some circumstances in which slate roofs can have a minimum pitch as low as 17.5°, but this depends on the type of slate being used, the size of the lap, and some other factors.

How far apart should battens be?

12” to 24”
But how far apart should each batten be? Typically, batten are spaced anywhere from 12” to 24” apart.

How far apart do you put roof battens?

Battens should be fixed to rafters set at centres not more than 600mm apart. They should span at least three rafters and be at least 1.2m long. No more than one in four battens should be joined over one truss for gauges over 200mm.

How do I calculate how many slates I need?

As a guide, a slate of 500 x 250 sizes uses a slate and half of 500 x 375. You would need 2.5 of these slate per linear metre. Therefore, if your rafter length was 4 linear meters, your calculation would be 4 x 2.5 = 10 Quantity slate & Half’s.

How many battens should be on a roof?

Check size and spacing of battens Here are some guidelines to bear in mind: Battens should be fixed to rafters set at centres not more than 600mm apart. They should span at least three rafters and be at least 1.2m long. No more than one in four battens should be joined over one truss for gauges over 200mm.

What roof pitch is 30 degrees?

7/12 roof
What roof pitch is 30 degrees? A 30° roof pitch is roughly the same as a 7/12 roof pitch. To convert from degrees to the American ratio: Find the tangent of the angle, tan(angle).

How do you calculate the Batten gauge for Slate?

It also allows you to determine the holing gauge (distance from hole to tail of slate) and the number of linear metres of batten per m 2 of roof. The batten gauge can also be calculated using the formula Batten gauge = (length of slate-headlap)/2.

What do you use to measure slate for roof?

Roof battens and gauge– The gauge is the space between the roof battens, this will set the overlap of your chosen slate in most cases. What roof pitch do I need for what slate size

How big of a batten do you need for slate roof?

The basics. The slate or tile manufacturer or supplier will specify the size of battens to be used, typically this would be 40 x 20mm (1.5 x ¾ inch), but where the horizontal gaps between rafters is large or the slates/tiles are heavy, then bigger battens may be needed.

How do you measure the size of a roof batten?

Spacing the battens. Measure between the top of the top batten and the top of the lower batten and this divide this measurement by the manufacture’s ‘gauge’ – this will give the number of slates/tiles rows need to cover the roof.