Metal Roofing. The Devil is in the Details SSRLU3B. I LU/HSW Hour

Transcription

1 Metal Roofing The Devil is in the Details SSRLU3B I LU/HSW Hour

2 Best Practice Slide MBCI is a Registered Provider with the American Institute of Architects Continuing Education Systems. Credit earned on completion of this program will be reported to CES Records for AIA members. Certificates of Completion for non-aia members are available on request. This program is registered with the AIA/CES for continuing professional education. As such, it does not include content that may be deemed or construed to be an approval or endorsement by the AIA of any material of construction or any method or manner of handling, using, distributing, or dealing in any material or product. Questions related to specific materials, methods, and services will be addressed at the conclusion of this presentation. 2

3 Learning Objectives Attendees will learn that long term roof system performance requires long term thinking when designing details incorporated into a metal roof system. Attendees will be visually exposed to both correct and incorrect details and conditions that are best avoided when possible. Attendees will learn how roof penetrations should be specified and installed to provide long term weathertightness. Attendees will learn about dissimilar metals and how they affect a roof s service life. 3

4 Ridge Detail 4

5 Ridge Detail 5

6 Ridge Detail 6

7 Two Basic Principles Think Long Term (20 Years) Don t count on exposed sealant to be a long-term solution. Use trim, fasteners and accessories that will last as long as the roof. 7

8 Rusted Fasteners 8

9 Rusted Valley Gutter 9

10 Rusted Flashing 10

11 11

12 Two Basic Principles Think 20 Years Down The Road The Harder You Make Something, The Less Chance It Will Be Done Right 12

13 Where Do Metal Roofs Leak? Penetrations Roof Curbs 13

14 Roof Curbs Use curbs made from aluminum or stainless steel Use under/over curbs Require a minimum of 12 between the panel end and the diverter on the upslope end and 6 between the curb sides and panel seams Use rib-to-rib curbs Require roof contractor to supply and install curbs, not the HVAC contractor. 14

15 Roof Curb 15

16 Roof Curb 16

17 Roof Curb 17

18 Roof Curb 18

19 Roof Curb 19

20 Roof Curb 20

21 Where Do Metal Roofs Leak? Penetrations Roof Curbs Pipes/Structural Members 21

22 Pipe/Structural Penetrations Do not use residential pipe jacks Do not penetrate the panel seam Do not block the flow of water Require the roofing contractor to install or supervise all pipe and structural penetrations 22

23 Incorrect Pipe Jack 23

24 Incorrect Pipe Jack 24

25 Incorrect Installation 25

26 Correct Pipe Penetration 26

27 Incorrect Installation 27

28 Curb Base 28

29 Correct Pipe Penetration 29

30 Correct Pipe Penetration 30

31 Penetrations By Other Trades 31

32 Penetrations By Other Trades 32

33 Penetrations By Other Trades 33

34 Penetrations By Other Trades 34

35 Penetrations By Other Trades 35

36 Penetrations By Other Trades 36

37 Penetrations By Other Trades 37

38 Penetrations By Other Trades 38

39 Penetrations By Other Trades 39

40 Where Do Metal Roofs Leak? Penetrations Details 40

41 Details Valley Use a vertical leg SSR when possible Use a valley trim that is wide enough to handle the flow of water. At fixed eave valleys, use triple bead tape sealer and place fasteners at a close enough spacing to prevent fish mouthing Do not use offset cleat method on roofs with low pitches Seal the ends of the panel seams Never use a starter J 41

42 Incorrect Bevel Cutting 42

43 Correct Bevel Cutting 43

44 Vertical Rib Panel Installation 44

45 Offset Cleat 45

46 Trim Intersections Seal properly between trim pieces Shingle trim where required Make attachments in the high when you can 46

47 Valley Intersection At Upslope End Of Dormer 47

48 Valley Intersection At Upslope End Of Dormer 48

49 Valley Intersection At Upslope End Of Dormer 49

50 Ridge/Hip/Hip Intersection 50

51 Plan Review Dead Valley 51

52 Details Dead Valley Create an endlap in the roof panel where the valley trim terminates Try to lay out panels so a panel seam does not hit at the valley termination point You may need to press break a special panel 52

53 Dead Valley 53

54 Dead Valley 54

55 Dead Valley 55

56 Dead Valley 56

57 Dead Valley 57

58 Dead Valley 58

59 Plan Review Eave Offset 59

60 Details Eave Offset On short offsets, consider using gutter in lieu of rake trim On long offsets, install a slip joint to allow for the differential in thermal movement 60

61 Eave Offset 61

62 Eave Offset 62

63 Eave Offset 63

64 Eave Offset 64

65 Plan Review Dutch Hip Ridge Ridge Ridge Offset 65

66 Details Ridge Offset Where possible, fix the roof at the ridge and use a simple ridge flash Install an EPDM membrane under the trim intersection at the ridge 66

67 Ridge Offset 67

68 Ridge Offset 68

69 Details Parapet Walls Allow for thermal movement Surface mount counter flashing is the least likely method to stay watertight Build in redundancy at less than perfect conditions Use welded aluminum crickets and other appurtances where needed 69

70 Ridge/Parapet Intersection 70

71 Ridge/Parapet Intersection 71

72 High Eave/Parapet Intersection 72

73 High Eave/Parapet Intersection 73

74 Low Eave/Parapet Intersection 74

75 Parapet Offset 75

76 Parapet Offset 76

77 Details Roof Transitions Try to keep transitions outside the building envelope If this is not possible, seal the wall area with metal or a waterproof membrane before installing the roof Use with caution in areas that experience heavy ice and snow 77

78 Roof Transition 78

79 Roof Transition

80 80

81 Other Areas Of Concern Corrosion Cutting Metal Panels 81

82 Corrosion From Improper Cutting Of Panels 82

83 Rust Debris From Cutting Panles On Roof 83

84 Other Areas Of Concern Corrosion Cutting Metal Panels Dissimilar Metals 84

85 Lead Roof Jack 85

86 Graphite On Roof 86

87 Copper Lightning Cable 87

88 Copper 88

89 AC Condensate 89

90 AC Condensate 90

91 Treated Wood 91

92 Treated Wood 92

93 S-5! Clamps 93

94 Other Areas Of Concern Corrosion Cutting Metal Panels Dissimilar Metals Underlayments 94

95 Felt Underlayment 95

96 Felt Underlayment 96

97 Felt Underlayment 97

98 Other Areas Of Concern Corrosion Cutting Metal Panels Dissimilar Metals Improper Repairs Ice And Snow 98

99 Ice and Snow 99

100 Ice and Snow 100

101 Ice and Snow 101

102 Ice and Snow 102

103 Ice and Snow 103

104 Ice and Snow 104

105 Ice and Snow 105

106 Ice and Snow 106

107 Ice and Snow 107

108 Ice and Snow 108

109 Ice and Snow 109

110 Ice and Snow 110

111 Ice and Snow 111

112 Ice and Snow 112

113 Ice and Snow 113

114 MBCI THANKS YOU FOR YOUR ATTENDANCE QUESTIONS? This concludes the American Institute of Architects Continuing Education Systems Program 114

115 Other AIA Presentations Available Standing Seam Metal Roof Seminar - 1 Hr Standing Seam Roof Design Details & Weathertightness - 3 Hr Insulated Metal Panels 1Hr Retrofit Roof Systems 1 Hr Retrofit Metal Roof Systems-Ensuring A Successful Project 3 Hr A Review Of Metal Panel Warranties 1 Hr 115