how to determine the angel of a pitch roof?

Answer 1

45 degrees is 12-12 thats 12 inch rise in 12 inch run
10-12 is 40 degrees
8-12 is 35
7-12 is 30
6-12 is27
5-12 is 23
4-12 is19
3-12 is14
2-12 is 10
1-12 is 5
0-12 is flat

if you have a framing square or speed square just check the angle cut ont the gable end trim

Answer 2

if you can get on the roof safely, or preferably, lean an extension ladder against the roof soffit, I know a quick way to determine the pitch, we do it all the time on my crew.

Find a four ft. level and a tape measure. Let one end of the level rest on the roof and bring the other end up or down until the bubble centers. Measure from the end of the level straight down to the roof. Divide this by four and viola! your pitch.

Example: If you read 24 inches from the end of the level to the roof, you have a 6 / 12 pitch. These numbers mean the RISE and RUN of the roof. Meaning that for every 12 inches you go horizontally, the roof rises 6 inches. Look at Aaron A's reply to see the corresponding angles.

Answer 3

Sorry, no being awkward but do you mean the angle of an existing roof , or one you are about to build ?

Measurements of existing roofs are covered above.

For a new roof its often best to use the same angle as the next roof sp it blends in and looks the same. Councils will have guidlines on whats required for building regs, maybe ask them.

Our house has built up over 400 years, so its got all sorts of pitch roofs varying between 22 and 45 degrees.

22 degrees is too low, you can get wind driven rain blown under the slates onto the felt.

Answer 4

Well I am going to attempt to tell you in terms that I believe you might be able to understand. First do you know what a framing square is? O.K. if not the blade of a framing square is 24 inches long and the tongue of the framing square is 18 inches long and are at right angles from one another, there are a lot of numbers on both sides of a framing square, you will only be interested in aether the inside or the outside numbers. You will be working with the inch side, if you are able to climb a ladder go to the edge that you are wanting to know about, Lets say you go to the bottom right hand corner, with the blade of the framing square in your right hand and the tongue of the framing square in your left hand hold it against the roof edge with the of the blade level read the inch scale on the tongue, lets say you are reading 4 inches that would mean you have a roof pitch of 4 and 12, if you are reading 6 inches on the tongue you have a 6 and 12 pitch. I tried not to make this to difficult, and it isn't, but when you don't know it's hard to explain in the terms you may understand. by the way you may need a small level for the blade to know if it is level. Hope this helps.

Answer 5

The angle, or pitch, of a roof is calculated by the number of inches it rises vertically for every 12 inches it extends horizontally. For example, a roof that rises 6 inches for every 12 inches of horizontal run has a 6-in-12 pitch.

Knowing the pitch of your roof is useful when designing an addition, installing skylights, or cutting new rake boards. Here's an easy, safe way to determine the pitch from inside your attic. You'll need an 18- or 24-inch level, a tape measure, and a pencil.

The angle, or pitch, of a roof is calculated by the number of inches it rises vertically for every 12 inches it extends horizontally. For example, a roof that rises 6 inches for every 12 inches of horizontal run has a 6-in-12 pitch.

Knowing the pitch of your roof is useful when designing an addition, installing skylights, or cutting new rake boards. Here's an easy, safe way to determine the pitch from inside your attic. You'll need an 18- or 24-inch level, a tape measure, and a pencil.

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First, measure 12 inches from one end of the level and make a mark. Then, in the attic, place the end of the level against the bottom of a roof rafter and hold it perfectly level. Now measure vertically from the 12-inch mark on the level straight up to the underside of the rafter, as illustrated. That measurement is the number of inches the roof rises in 12 inches.

Answer 6

I assume you meant "angle", not "angel."

Draw an isosceles triangle where the base is the width of the building and the legs are the distance from the edge of the roof to the peak. Drop a perpendicular from the vertex to the base. Use the inverse cosine function to determine the angle you seek.

Answer 7

I didn't know angels belonged to pitch roofs. I suppose you measure them with a tape measure

Answer 8

Oh, I want one. An Angel of my roof - in good time for Christmas, too.

Answer 9

Very simple. You buy an angle finder for £3.00 or so, lay it on the roof and read the angle displayed. Any tool shop or Ebay should have loads.

Ignore all that drawing squares stuff! That went out with the Egyptians, or maybe it was the Romans :-)

http://cgi.ebay.co.uk/ANGLE-FINDER_W0QQitemZ150040716951QQihZ005QQcategoryZ303QQrdZ1QQcmdZViewItem

Answer 10

easiest way go to b&q they sell a t/roof square £6-00 gives you all the angles simple to use, any d.i.yer can use it