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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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Pitched roof angle
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Pitched roof angle
When I had an extension done I thing the pitch was 22.5 degrees. Done
to fit under an upstairs window. Try ringing local building control tend to be very helpfull. Will probably also depend on the tiles. On Wed, 10 Sep 2003 13:32:32 +0000 (UTC), "Trevor Smith" wrote: Could anyone tell me the minimum angle for a pitched, slated roof. We have a flat felted kitchen roof at present and I'd like to change it to a pitched, lean-to, type roof for better looks and relaibility. Also, does location matter - we're in a seaside town on Cornwall where you tend to get horizontal rain! Lawrence usenet at lklyne dt co dt uk |
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Pitched roof angle
On Wed, 10 Sep 2003 14:45:02 +0100, Lawrence
wrote: When I had an extension done I thing the pitch was 22.5 degrees. Done to fit under an upstairs window. Try ringing local building control tend to be very helpfull. Will probably also depend on the tiles. On Wed, 10 Sep 2003 13:32:32 +0000 (UTC), "Trevor Smith" wrote: Could anyone tell me the minimum angle for a pitched, slated roof. We have a flat felted kitchen roof at present and I'd like to change it to a pitched, lean-to, type roof for better looks and relaibility. Also, does location matter - we're in a seaside town on Cornwall where you tend to get horizontal rain! It depends on the roofing material. My kitchen extension has a pitch of 17.5 degrees, and it had to have special roof tiles that worked at that pitch (which had a minimum useable pitch of 17.5). The tiles had to be laid with a certain overlap, and the architect was so paranoid about the angle that he specced trussed rafters, much to the builder's annoyance. Suggest you find a suppplier of slate tiles and ask them about pitch. --- Regards, Colin Swan |
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Pitched roof angle
In article , Trevor Smith wrote:
Could anyone tell me the minimum angle for a pitched, slated roof. If slate type interlocking tiles are acceptable you can get down to 15 degrees with Redland Cambrian http://www.lafarge-roofing.co.uk/cgi..._cambrian_3 0 or http://www.lafarge-roofing.co.uk then follow the trail -- Tony Bryer SDA UK 'Software to build on' http://www.sda.co.uk Free SEDBUK boiler database browser http://www.sda.co.uk/qsedbuk.htm |
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Pitched roof angle
Could anyone tell me the minimum angle for a pitched, slated roof.
I've heard it can be done down to 18 degrees without it getting too complicated, but much further takes some doing. Christian. |
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Pitched roof angle
Trevor Smith wrote:
Could anyone tell me the minimum angle for a pitched, slated roof. We have a flat felted kitchen roof at present and I'd like to change it to a pitched, lean-to, type roof for better looks and relaibility. Also, does location matter - we're in a seaside town on Cornwall where you tend to get horizontal rain! It is totally dependent on the tiles or slates used. I had one - still got teh tiles if you want - horrid things - at about 20 degrees - wasn't bad till the valleys strated leaking. So I knocked the house down and built a new one. Normal tiles 42 degrees is roughly it, but builders like 45 cos it makes the maths doable by a gibbon with a CSE in Graffiti. Thatch is 50 minimum. |
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Pitched roof angle
"Trevor Smith" wrote in message ... Could anyone tell me the minimum angle for a pitched, slated roof. We have a flat felted kitchen roof at present and I'd like to change it to a pitched, lean-to, type roof for better looks and relaibility. Also, does location matter - we're in a seaside town on Cornwall where you tend to get horizontal rain! The pitch depends on the tiles or slate you are going to use ..if you look at the web site of whoever's tiles you want to use, the tech sheet will state the minimum pitch. There is typical no max pitch as you can carry out vertical tiling. Rick |
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Pitched roof angle
Not quite what the OP asked but...
My low pitched corrugated asbestos garage roof drips condensation from the underside in cold damp conditions. What pitch does the roof need to be to cause the condensation to run down rather than drip off? Roger |
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Pitched roof angle
"Trevor Smith" wrote in message ... Could anyone tell me the minimum angle for a pitched, slated roof. We have a flat felted kitchen roof at present and I'd like to change it to a pitched, lean-to, type roof for better looks and relaibility. Also, does location matter - we're in a seaside town on Cornwall where you tend to get horizontal rain! I built an extension where the roof had to have a very shallow pitch - about 10 degrees. It was slated, but under the slates was felt laid in the normal way. On top of the felt were vertical laths with horizontal laths nailed across to take the slates. This way no nails went through the felt and the thing has been perfect so far (10 years). Rob Graham |
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Pitched roof angle
Bluestars wrote:
Not quite what the OP asked but... My low pitched corrugated asbestos garage roof drips condensation from the underside in cold damp conditions. What pitch does the roof need to be to cause the condensation to run down rather than drip off? Now there is a curious question. With MANY variables, like teh surface tension ofteh water, and teh stickiniess of the roof interiors, its roughness and so on. In short, it depends on too many variables to give any answer other than a really rough one. Roger |
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Pitched roof angle
robgraham wrote:
"Trevor Smith" wrote in message ... Could anyone tell me the minimum angle for a pitched, slated roof. We have a flat felted kitchen roof at present and I'd like to change it to a pitched, lean-to, type roof for better looks and relaibility. Also, does location matter - we're in a seaside town on Cornwall where you tend to get horizontal rain! I built an extension where the roof had to have a very shallow pitch - about 10 degrees. It was slated, but under the slates was felt laid in the normal way. On top of the felt were vertical laths with horizontal laths nailed across to take the slates. This way no nails went through the felt and the thing has been perfect so far (10 years). Rob Graham However the felt is not supposed to stop water, but airflow. Its NOT a good idea to have sagging felt with puddles forming in it around your timber battens. Mind you, as a bodge, its a good one. You can use slates on a low pitched roof but you need to overlap more. I suppose the true answer is something to do with the maximum height water can be driven up a slope for a given airflow. Machine tiles fit very accurtely, so aiflow through the gaps is very restricted, hence they water dosn't drive up very far. Slates are a lot worse, and don't have interlocking ridges, but my guess is that 30 degrees is probably (near) the limit unless you go for BIG overlaps. Peg tiles - especially hand made - are the worst as they are irregular with large gaps. |
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Pitched roof angle
"Bluestars" wrote in message ...
Not quite what the OP asked but... My low pitched corrugated asbestos garage roof drips condensation from the underside in cold damp conditions. What pitch does the roof need to be to cause the condensation to run down rather than drip off? That's surely going to depend hugely on the nature of the surface which the condensation is running down... I would imagine a completely smooth surface like glass would allow drops to run at a much shallower angle than say, rough sawn timber, where there will be a tendency for drops to propagate at a high point like a splinter, and fall off. I expect it might make a difference whether the surface is absorbent or not? David |
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Pitched roof angle
IIRC, Redland (now LaFarge) do a tile down to 12 degrees. I think it
is the "Regent" interlocking concrete tile. Manufacturers specify the minimum angle, but with proper precautions in terms of lap, fixing and underfelt, then you can go down a few degrees more. dg "Trevor Smith" wrote in message ... Could anyone tell me the minimum angle for a pitched, slated roof. We have a flat felted kitchen roof at present and I'd like to change it to a pitched, lean-to, type roof for better looks and relaibility. Also, does location matter - we're in a seaside town on Cornwall where you tend to get horizontal rain! |
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Pitched roof angle
In article , The Natural Philosopher wrote:
However the felt is not supposed to stop water, but airflow. Its NOT a good idea to have sagging felt with puddles forming in it around your timber battens. That's what the counter battens are for. We used to allow low pitched roofs built like this, but only with ply over the rafters to support the felt -- Tony Bryer SDA UK 'Software to build on' http://www.sda.co.uk Free SEDBUK boiler database browser http://www.sda.co.uk/qsedbuk.htm |
#15
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Pitched roof angle
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