Do slate roofs have underlayment?
In slate roofing, water migration is controlled primarily by the angle of the roof’s slope. The steeper the slope, the less water migration there will be. Underlayments: Underlayments are installed on the roof deck, prior to the installation of the slate roofing shingles.
What is the minimum slope for a slate roof?
20 degrees
‘The minimum pitch for any double-lap slating is actually only 20 degrees, but there are many design factors that go in to this and so, in reality, this is rarely seen; a more realistic minimum pitch for most slates is around 27.5 degrees, but even this depends on certain conditions’.
How much overhang should a slate roof have?
I agree, we always leave a 50mm overhang regardless (unless we have to match details elsewhere) with a mortared verge onto an undercloak. This also gives the roof a good appearance.
Does a slate roof need battens?
Slates should always be installed double lap. Concrete slates require 38x25mm batten for 450mm joist spans and 50x25mm batten for 600mm joist spans. Timber shingles and shakes will need a timber batten size of 38x25mm for spans up to 450mm, and 50x25mm for 600mm spans.
How do you measure a roof for slate?
The amount of slates you need per square metre (m2) depends on which slate size you’re using. For example, if you’re using a 20×10 slate (500mmx250mm), you will require 21 slate per m2. A 24×12 slate (600mmx300mm) demands only 13 slate per m2.
What goes under slates on a roof?
Roofing felt
Roofing felt, otherwise known as roofing underlay, sits underneath the tiles or slate on your roof and secures them in place. The felt is laid on the top of the supporting rafters and beneath the tiles or slate battens.
Does a slate roof need a membrane?
You’ll also need to use a high-quality breathable membrane beneath the slates, and ensure that sufficient ventilation space is left between the boarding the slates are attached to and the insulation layer beneath to prevent condensation problems with your slate roof.
How much should slate tile overlap?
On a slate roof this is the critical overlap and is necessary to prevent water penetration and leakage. The roof pitch typically relates to the required head lap as follows: 20 degrees: 115 mm minimum head lap. 25 degrees: 85 mm.
What batten spacing for slates?
The minimum size of a batten for slating is 25x50mm. It is recommended that, once battens are fixed, every second perpendicular line is marked for slate joints. A gap of 3–5mm between each slate is recommended.
What is slate roofing?
Slate is a natural material. It has incredible innate characteristics which makes natural slate the best roofing material known to man. It has a lifespan of more than 100 years and once installed it requires no maintenance and can consistently perform against extreme weather conditions.
What is the lifespan of a slate roof?
It has incredible innate characteristics which makes natural slate the best roofing material known to man. It has a lifespan of more than 100 years and once installed it requires no maintenance and can consistently perform against extreme weather conditions. The most durable roofing material: more than 100 years of working life.
How are slate shingles made?
The stone is dug or quarried from the earth, brought to the surface, then hand split with a hammer and chisel into thin sheets about a quarter of an inch thick. These slate shingles are then trimmed into particular shapes, usually punched for nail holes and are then ready to be installed on a roof.
Why choose American slate tiles?
Mined from premiere quarries worldwide and selected for natural strength and dramatic beauty, American Slate tiles are made from natural stone which thrives out in the elements and is ideal for slate roofs and siding. Slate is a natural material.