Working out the pitch of a roof
- Thread starter DonDonson
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Trigonometry.
By measuring the sides of the triangle and doing a bit of arithmetic you can use sin, cosine or tangent to get the pitch in degrees.
Or just use a simple angle finder!
By measuring the sides of the triangle and doing a bit of arithmetic you can use sin, cosine or tangent to get the pitch in degrees.
Or just use a simple angle finder!
All you need is a measuring tape, a spirit level and a scientific calculator.
Use say a 1200mm level and rest one end against the roof slope and hold it level. Measure vertically from the non touching end to the roof.
Divide the vertical measurement by the length of the level i.e. 1200 and then press inv tan (tan-1) on the calculator and you will have the pitch in degrees.
Use say a 1200mm level and rest one end against the roof slope and hold it level. Measure vertically from the non touching end to the roof.
Divide the vertical measurement by the length of the level i.e. 1200 and then press inv tan (tan-1) on the calculator and you will have the pitch in degrees.
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P.S. this can be done inside or outside the roof, but outside means the level will rest and free up a hand.
The level can be any length but the longer the level the more accurate you will be.
The level can be any length but the longer the level the more accurate you will be.
FWIW:
1. take a min. 12" level and a tape measure. Stand some distance from the gable/verge.
2. hold the level at arms length while keeping it even.
3. eyeball one end of the level with the eaves.
4. determine the 12"point along the level.
5. from the 12" point measure up vertical to hit the roof/verge line.
6. eg. say 8" measured from level to roofline.
7. you now have a base of 12", and a rise of 8"
8. given the above measurements, then there are various ways of working out the pitch, or the cut, of the roof - any pitched roof, at any reasonable distance.
note: if you were actually on the above roof, then you would measure out a level 12"from the roof covering, and then measure down - which would be, of course, 8".
1. take a min. 12" level and a tape measure. Stand some distance from the gable/verge.
2. hold the level at arms length while keeping it even.
3. eyeball one end of the level with the eaves.
4. determine the 12"point along the level.
5. from the 12" point measure up vertical to hit the roof/verge line.
6. eg. say 8" measured from level to roofline.
7. you now have a base of 12", and a rise of 8"
8. given the above measurements, then there are various ways of working out the pitch, or the cut, of the roof - any pitched roof, at any reasonable distance.
note: if you were actually on the above roof, then you would measure out a level 12"from the roof covering, and then measure down - which would be, of course, 8".
If it's an existing roof and you have an Android phone or I-phone it's bloody easy, download free app, rest on roof and read angle
Obviously does to me or I wouldn't be asking the question, I'm looking to replace the polycarbonate sheets with ply, felt and felt shingles and they recommend not to lay shingles on a roof with a pitch less then 15 degrees with normal exposure roof with 1 or 2 layer high performance underlay - otherwise minimum 20 degrees pitch.
Can't agree with that, I think it will look worse from the outside being able to see through the plastic 3 ply insect filled damp roof and seeing the back of insulated plaster board. And that's not going to do much to the horrendous noise you get when it rains, and you cant put spot lights in either unless you drop the ceiling, and if you do your left with a mini green house between the ceiling and the roof, Felt shingles are only an idea, have thought of tiles as well but is all down to the pitch, there's some great lightweight alternatives for this common problem, take a look at this website http://www.guardianroof.co.uk/
Well here's a tip ... if the roof goes up to near the bedroom window cill's or about 900mm , then its more than 15 degrees. If it rises by a few course of brick then its less than 15 degrees. That covers 99% of conservatory roof installations
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Can't agree with that, I think it will look worse from the outside being able to see through the plastic 3 ply insect filled damp roof and seeing the back of insulated plaster board. And that's not going to do much to the horrendous noise you get when it rains, and you cant put spot lights in either unless you drop the ceiling, and if you do your left with a mini green house between the ceiling and the roof, Felt shingles are only an idea, have thought of tiles as well but is all down to the pitch, there's some great lightweight alternatives for this common problem, take a look at this website http://www.guardianroof.co.uk/[/QUOTE]
if you think that looks good - God help you.
I thought this site was for gaining help and advice with anything DIY?? Not being made to feel like what you are planning to do will look ****, if you don't like what I'm planning to do then you don't have to do it yourself, but if you have any helpfull advice please comment. Joe-90 obviously stands for joe IQ minus 90. By the amount of posts you have, including others ive noticed that are just silly comments to other questions for advice it seems you need to get out a bit more!!!
I do think this forum is great for help by the way, but I can't say that I will be on here for the rest of my life unlike some other, box room dwelling, chain smoking, animal porn watching forum fanattic!!!
I do think this forum is great for help by the way, but I can't say that I will be on here for the rest of my life unlike some other, box room dwelling, chain smoking, animal porn watching forum fanattic!!!
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