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# Hip &amp; Valley

Hip &amp; Valley. Hip Valley Roof. This is to be used in conjunction with the following plan which can be found here. Is the Roof a True Hip &amp; Valley Roof. Spans are equal. Is the Roof a True Hip &amp; Valley Roof. Rise will be the same and ridges will meet in the centre.

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## Hip &amp; Valley

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1. Hip & Valley

2. Hip Valley Roof • This is to be used in conjunction with the following plan which can be found here

3. Is the Roof a True Hip & Valley Roof Spans are equal

4. Is the Roof a True Hip & Valley Roof Rise will be the same and ridges will meet in the centre

5. Is the Roof a True Hip & Valley Roof If Spans are not equal ridges will not meet

6. Is the Roof a True Hip & Valley Roof If Spans are not equal ridges will not meet This part of the roof is still going up

7. Is the Roof a True Hip & Valley Roof If Spans are not equal ridges will not meet This part of the roof is going down This part of the roof is still going up

8. Is the Roof a True Hip & Valley Roof To Solve this we have to construct a Broken Hip which is the next roof

9. Determine The Spans

10. Determine The Spans Every Ridge must have a Span

11. Determine The Spans Span is tied to the Basis of the Common Rafter Calculation

12. Determine The Spans Same Rafters Span is tied to the Basis of the Common Rafter Calculation

13. Determine The Spans Same Rafters Must be same Span Span is tied to the Basis of the Common Rafter Calculation

14. Hip & Valley Roof • STEP 1 • As always Determine the 1 metre triangles • Please review Gable & Hip roofs if you do not know how to do this Hip Length per 1m of Rafter Plan length Rafter Length per 1m of Rafter Plan length Rise per 1m of Rafter Plan length 1.000 1.414

15. Hip & Valley Roof • STEP 1 • As always Determine the 1 metre triangles • Please review Gable & Hip roofs if you do not know how to do this Pitch 32° 1.546 1.179 0.625 1.000 √2

16. Hip & Valley Roof • STEP 1 • As always Determine the 1 metre triangles • Please review Gable & Hip roofs if you do not know how to do this Rafter = Plan Length x Rafter per m 1.179 1.649 0.625 32° 1.000 1.414

17. Determine Common Rafter Rafter = Plan Length x Rafter per m = (5400 – 9.5) x 1.179 = 6356 Rafter 90 x 35 @ 450 c to c Ridge 140 x 19 Valley 140 x 45 1.179 1.649 5400 0.625 32° 1.000 1.414

18. Determine Valley Rafter Valley is determined in the exact same manner as the Hip Rafter Valley Rafter = ½ Span x Hip / m = 2700 x 1.649 = 4452 The hip is usually measured as per the Hip Rafter. Calculation is only for estimating Rafter 90 x 35 @ 450 c to c Ridge 140 x 19 Valley 140 x 45 5400 1.179 1.649 0.625 32° 1.000 1.414

19. Determine Valley Rafterfor Estimating Valley is determined in the exact same manner as the Hip Rafter Valley Rafter = (½ Span + O/H )x Hip / m = (2700 + 600) x 1.649 = 5542 + 140 (Plumb Cut) = 5682 = 5700 Note if Hip is required to be joined you should allow at least 300mm Rafter 90 x 35 @ 450 c to c Ridge 140 x 19 Valley 140 x 45 Overhang 600 5400 1.179 1.649 0.625 32° 1.000 1.414

20. Plumb Cut ValleyUsing Steel Square 209 ÷3 471 Rafter 90 x 35 @ 450 c to c Ridge 140 x 19 Valley 140 x 45 Overhang 600 5400 1.179 1.649 0.625 32° 1.000 1.414

21. Plumb Cut ValleyPitch Mathematically Tan Pitch° = Rise ÷ Plan Length = 0.625 ÷ √2 = 0.442 Inv Tan (0.442) = 23.8° or 23.8° (Note Inv is not mathematical inverse Function but the Calculators Trig inverse Rafter 90 x 35 @ 450 c to c Ridge 140 x 19 Valley 140 x 45 Overhang 600 5400 1.179 1.649 0.625 32° 1.000 1.414

22. Valley True Length ½ Span = 2700 Valley Plan Length = ½ Span – ½ Ridge Thickness = 2700 – 17.5 = 2682.5 Ridge 140 x 35 ½ Span – ½ Ridge Thickness

23. Valley True Length ½ Span = 2700 Valley Plan Length = ½ Span – ½ Ridge Thickness = 2700 – 17.5 = 2682.5 True Length = Plan Length x Hip/m = 2682.5 x 1.649 = 4423 Ridge 140 x 35 ½ Span – ½ Ridge Thickness

24. Valley Creepers Plan Length = ½ Span – (½ Valley x √2 + ½ Rafter) – ½ Ridge = 2700 – (22.5 x √2 + 17.5) -17.5 = 2618 ½ Span = 2700 Ridge 140 x 35 Valley 140 x 45 Rafter 90 x 35

25. Valley Creepers – 1st Creeper Plan Length = ½ Span – (½ Valley x √2 + ½ Rafter) – ½ Ridge = 2700 – (22.5 x √2 + 17.5) -17.5 = 2618 True Length = Plan Length x Rafter /m = 2618 x 1.179 = 3087 ½ Span = 2700 Ridge 140 x 35 Valley 140 x 45 Rafter 90 x 35

26. Valley Creepers – 1st Creeper Plan Length = ½ Span – (½ Valley x √2 + ½ Rafter) – ½ Ridge = 2700 – (22.5 x √2 + 17.5) -17.5 = 2618 True Length = Plan Length x Rafter /m = 2618 x 1.179 = 3087 Creeper Shortening = Spacing x Rafter Length / m = 450 x 1.179 = 531 This will be the same as the Hip ½ Span = 2700 Ridge 140 x 35 Valley 140 x 45 Rafter 90 x 35 @ 450 c to c

27. Valley Creepers – 1st Creeper Plan Length = ½ Span – (½ Valley x √2 + ½ Rafter) – ½ Ridge = 2700 – (22.5 x √2 + 17.5) -17.5 = 2618 True Length = Plan Length x Rafter /m = 2618 x 1.179 = 3087 Creeper Shortening = Spacing x Rafter Length / m = 531 ½ Span = 2700 Ridge 140 x 35 Valley 140 x 45 Rafter 90 x 35 @ 450 c to c

28. Valley Creepers – All Creepers Plan Length = ½ Span – (½ Valley x √2 + ½ Rafter) – ½ Ridge = 2700 – (22.5 x √2 + 17.5) -17.5 = 2618 True Length = Plan Length x Rafter /m = 2618 x 1.179 = 3087 Creeper Shortening = Spacing x Rafter Length / m = 531

29. Valley Creepers Plumb Cut As it is the same pitch as the Rafter it is the same Steel Square 313 500

30. Valley Creeper – Edge Bevel Same as Hip Creeper Rafter Centreline Length ½ Span Ridge

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