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What's the shallowest allowable slope for a slate roof?

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RayL12 is offline

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What's the shallowest allowable slope for a slate roof?

On 14/08/2017 5:22 PM, wrote:
On Tuesday, 17 March 2009 10:57:50 UTC, hulk hogan wrote:
My architect has specified slate on a roof with a slope of 16.8
degrees. Is that too shallow? Googling implies that 4:12 is the
shallowest you can go with slate. That's 20 degrees.

PS: does anyone have a digital copy of BS 5534 they could... 'make
available for download'?

Thanks.

I would never specify a slate roof at that pitch...Normally a min'm is 30 degrees. At that shallow angle, you would need a waterproof sub layer and the slates would have to be twice nailed at the head and at mid point otherwise they'll lift if a strong gust of wind gets underneath. Marley Eternit do a slate appearance tile with a thin Edge called the Edgemere Duo which looks like slate. That has a guarantee of going as low at 17.5 degrees.

I will back that up. 10degrees is low.

In my experience re-slating, there is a noticeable set of water blooms
on the slate below where the two upper slates bond. As you look at the
slate they appear as an upside down rounded 'V'. At 30 degrees that
bloom is as near as an inch from the top of the slate.

The lower the pitch the less the gravity comes into play.

Ray.

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