Think I know the answer to this but wanted to check....

numpty with a crowbar · 14 Aug 2012

Is a 9 degree pitch too low for a tiled roof? Tiles are double pantile that I managed to get for free for a workshop I'm planning - the hope was that I can build the front up to 2.5 meters and the rear to 1.9m and just use the front to back difference as the pitch (drop should be .6 meters over 3.4 meters)

If it's a bad plan I'll have to stick a ridge on and make it a drop of about .5m over 1.7m, but that's more of a faff (though not an actual problem to do)

But any advice would be welcomed

Cheers

SurreyRoofingEstimator · 14 Aug 2012

Yup, way too low. Min pitch (assuming something like a Grovebury) is 17.5 with 100m headlap or 22.5 with 75mm headlap

^woody^ · 14 Aug 2012

Board and felt it with seal laps and then tile it at that pitch

SurreyRoofingEstimator · 15 Aug 2012

Woody throws a curveball lol

Yes, we've done that with slates before so good option

numpty with a crowbar · 15 Aug 2012

Cheers for the responses folks - was going to go with option b until:

^woody^ said:
Board and felt it with seal laps and then tile it at that pitch

Right - I was planning on putting some OSB on it anyways, but from what you're suggesting could I:
1) OSB over the trusses
2) Felt over that (any type of felt?? Shed felt ok??)
3) pressure treated battens horizontally
4) tile on top of that

I'd costed in putting breathable roofing membrane under the tiles so can happily replace with roofing felt

Cheers for the advice though

Edit: Would this sort of thing be ok http://www.wickes.co.uk/slaters-felt-15x1m/invt/240007/

Stevetheroofer · 15 Aug 2012

Slaters felt will be no good as over three or four years of your tiles leaking it will rot away.
You need a quality flat roofing felt on your Osb boards then counter battens, then your breather felt and battens then your tiles.
Don't worry about the cost because in three years when you didn't do it properly and it's leaking your mrs will curse you for being a tight tw*t and get someone else into doing it. So do it right first time!

catlad · 15 Aug 2012

I breather membrane is going to be superfluous with that system.

numpty with a crowbar · 15 Aug 2012

Cheers folks, so assuming that I've understood what a counter-batten is and it runs "top to bottom" to allow any water to run down over the felt and escape at the bottom it should look like this??

And I assume by a "quality felt" that means "not £20 a roll shed felt"

catlad · 16 Aug 2012

Looks good to me.

numpty with a crowbar · 17 Aug 2012

Top notch - cheers folks

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Think I know the answer to this but wanted to check....

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