Tiling for shallow pitch roof

[economiser]

I want to reroof my double garage which currently has decayed fibre cement panels. I would like to use some sort of tiles if possible but would welcome any other suggestions for an aestheticlly pleasing roof. Problem is that it is only an 11.5 degree pitch.

[noseall]

11.5 degree!

.........sharp intake of breath!

tut tut!
there are metal tiles on the market which might suit. masona will tell you.

[big-all]

no expert but i think 3x that fall required for tiles to work normaly 34% ish in other words as rain can be driven underneath

[noseall]

minimum pitches for tiles.
rough guide.
30-35deg pitch plain tiles.
20 deg slates.
17-30 deg conc. interlocking.
there are a number of designs of interlocking tiles, only a few of which will allow for a shallow pitch. marley make a "wessex" which will go down to 15 deg with 100mm headlap.

[andymarshal]

redland regents go to 12.5 deg. or you could ply and felt under the tiles as to make an independant roof, the tiles would only really be for decoration.

Cheers

[noseall]

andymarshal wrote:

redland regents go to 12.5 deg. or you could ply and felt under the tiles as to make an independant roof, the tiles would only really be for decoration. Cheers

this method always amuses me, especially by the time youve fixed the lathes and punctured the felt several times.

[roofer4u]

A friend of mine has just had plans passed to put on a 9 degree roof using calderdale concrete tiles.

I have to board out the roof with 18mm ply then one layer of good quality torch-on, then lath out the roof.

My arguement was the same in that you are punturing the felt and also the laths would hold any water behind them.

His answer is to put a rubber grommet under that lath and nail through!!!!

We have come to an agreement on me putting offcutts of torch on felt packing under the point I nail the laths down, roughly every 2'!!

You just cant tell some people!!!

[JohnD]

Wouldn't you counterbatten down the slope before attaching the tiling battens, to enable water flow?

[vinty]

roofer4u wrote:

A friend of mine has just had plans passed to put on a 9 degree roof using calderdale concrete tiles. I have to board out the roof with 18mm ply then one layer of good quality torch-on, then lath out the roof. My arguement was the same in that you are punturing the felt and also the laths would hold any water behind them. His answer is to put a rubber grommet under that lath and nail through!!!! We have come to an agreement on me putting offcutts of torch on felt packing under the point I nail the laths down, roughly every 2'!! You just cant tell some people!!!

The problem is at such a low pitch the roof battens are constantly wet and eventually rot away

[datarebal]

Regents will go to 11.5 if no detailing on roof

[ban-all-sheds]

Can't decide whether to move this: http://www.diynot.com/forums/viewtopic.php?p=858471#858471 to this topic or leave it where it is...

[kujina]

Can anybody recomend any shingles that would be ok for a shed roof with a slope of 5 degrees? Or do I have to use normal roof felt?

[SurreyRoofingEstimator]

The tiles you want are Decra tiles that go down to a minimum 10 degrees

www.decra.co.uk

[gordonbee]

Ok, so from the above and other posts, for low pitch roof tiles, you can look at:

http://www.sandtoft.com/tiles/our-products/concrete-range/slate-appearance/calderdale-slate/product/
http://www.slecladding.co.uk/ondutile.htm
http://www.decra.co.uk/
http://www.forticrete.co.uk/products/40/centurion-low-pitch-roof-tile.html
http://www.marleyeternit.co.uk/Roofing/Concrete-Tiles/Wessex-Interlocking-Tile.aspx
http://www.monier.co.uk/products/product-catalogue/product-range/product/regent.html

For example, the Forticrete Centurion is spec.d down to 10'. BUT, in all cases, read the manufacturer's brochure for installation restrictions conditions and details. Then choose for yourself.

Also, try other threads like: http://www.diynot.com/forums/viewtopic.php?p=858471

DON'T get discouraged by comments in these threads like 'sharp in-take of breath' (not picking on anyone - just pointing out that, to be really useful, advice aught to be qualified). Other things like allowing sags in breather membranes/roofing felt will greatly reduce the chance of water going through nail holes, as will using thicker battens to prevent tile nails puncturing the felt. Proper ventilation will also help dry out those wet battens!

The Building Regs guys are there to help. In some cases they may be a bit over zealous but the other day I was told of one case of a private Regs company certifying what the council would not.

After all, The Building Regs are down to acceptable levels of risk.

When you see a problem, think of a way around it...

[chappers]

JohnD wrote:

Wouldn't you counterbatten down the slope before attaching the tiling battens, to enable water flow?

yes and in this situation the correct method is to use torch on under felt, then counter batten then torch on over and around the counter battens before fitting the slate battens.