Difference between revisions of "Draft CD 4"

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Difference between revisions of "Draft CD 4"

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</div>
 
</div>
 
<gallery mode="slideshow" showthumbnails>
 
<gallery mode="slideshow" showthumbnails>
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Image:Part 10 - SBS Parapet A1.png | link=https://rpm.rcabc.org/images/a/a9/Part_10_-_SBS_Parapet_A1.png
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Image:Part 10 - SBS Control Joint (Roof Divider) - A.png | Drawing A
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Image:Part 10 - SBS Parapet A2.png | link=https://rpm.rcabc.org/images/f/f9/Part_10_-_SBS_Parapet_A2.png
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Image:Part 10 - SBS Control Joint (Roof Divider) - B.png | Drawing B
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Image:Part 10 - SBS Parapet B,C.png | link=https://rpm.rcabc.org/images/c/cf/Part_10_-_SBS_Parapet_B%2CC.png
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Image:Part 10 - SBS Control Joint (Roof Divider) - C.png | Drawing C
 
</gallery>
 
</gallery>
  
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=== WORK INCLUDED ===
 
=== WORK INCLUDED ===
  
−
;(1) [[SBS Roof Systems Standard#PART_10|'''Base sheet membrane flashing''']]:  
+
;(1) [[SBS Roof Systems Standard#PART_10|'''Control Joint (Roof Divider)''']]:  
−
:On ''standard parapets'' (609.6 mm (24”) or less in height), install continuous base membrane flashing, from the roof field to outer face of the parapet top.  The machine direction of the membrane shall be oriented vertically. Carry membrane flashing in one piece over the top and down the exterior face as required in Article 10.3.2.3.
+
:Typically framed with dimensional lumber and plywood on site by the Contractor, or by others (as specified).  Insulated control joint shown in Drawing (C).  See [[SBS_Roof_Systems_Standard#10.1.6.2. Control Joints (Roof Dividers) |  Article 10.1.6.2.]] concerning permissible design heights for control joints.
 +
;(2) [[SBS Roof Systems Standard#PART_10|'''Base sheet membrane flashing''']]:
 +
:Fully envelope the control joint to ensure water-tightness on all sides.  The base membrane flashing also separates metal cap flashing (when specified) from any organic substrates (plywood, dimensional lumber).
 +
;(3) [[SBS Roof Systems Standard#PART_10|'''Cap sheet membrane flashing''']]:
 +
:Installed as required in Part 10 and applied as the second or third of a multi-ply membrane system, providing required coverage above the ''finished roof system surface'' (note that the required minimum coverage may be reduced when the joint is fully enveloped with two plies of membrane flashing (see illustration).
  
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:An alternative method of flashing for may be used (see Drawing (3C)) and is permissible <u>only if allowed in writing by the ''manufacturer''</u>.  Refer to the Standard for specific requirements.
+
:When the height of the control joint exceeds 203.2 mm (8”) (Ref. Drawing (C)), no fewer than two plies of sheet membrane flashing shall be carried up at least 203.2 mm above the ''finished roof system surface''.
  
−
:Note the minimum height requirement for parapets (127 mm (5”)), illustrated in Drawing (A).
+
;(3) [[SBS Roof Systems Standard#PART_13|'''Metal Cap Flashing''']]:
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;(2) [[SBS Roof Systems Standard#PART_10|'''Cap sheet membrane flashing''']]:
+
:Required only when the low control joint (less than 203.2 mm (8”) in height) is not fully enveloped with at least two plies of sheet membrane flashing.  Cap flashing must be designed and installed as required in [[SBS_Roof_Systems_Standard#PART_13 | Part 13]].
−
:Installed as required in Part 10 and applied as the second or third of a multi-ply membrane system, providing required coverage above the ''finished roof system surface''.  The three illustrated colours in Drawing (1) indicate various permissible methods, depending upon the ''manufacturer's'' published requirements:
+
 
−
::'''Option A''': Cap sheet membrane flashing terminated at the top inside edge of the parapet.
+
:Note that the cap flashing is sloped at least 2% (mono slope illustrated) when the width of the flashing exceeds 101.6 mm (4”) (Ref. [[SBS_Roof_Systems_Standard#13.1.3.6. Cap Flashing, Counter-flashing, and Reglet Flashing | Article 13.1.3.6., “Cap Flashing, Counter-flashing, and Reglet Flashing”]]).
−
::'''Option B''': Cap sheet membrane flashing carried onto parapet top surface at least 50.8 mm (2”).
+
 
−
::'''Option C''': Cap sheet membrane flashing completely covering top surface of parapet, terminated at outside edge.
+
:Fasteners used to secure metal flashing must be at least 88.9 mm (3-1/2”) above the finished roof system surface.
−
:Parapet in Drawing (A) illustrates the lowest permissible height (127 mm (5”)).  Note that for parapets with an inside face height up to 203.2 mm (8”), no fewer than two plies of sheet membrane flashing must cover the inside face of the parapet.
 
  
−
:When the parapet height (measured on the inside face) exceeds 203.2 mm (8”) (Ref. Drawings (C) and (D)), no fewer than two plies of sheet membrane flashing shall be carried up at least 203.2 mm above the ''finished roof system surface''.
+
<hr>
−
;(3) [[SBS Roof Systems Standard#PART_13|'''Metal Cap Flashing''']]:
 
−
:Designed and installed as required in Part 13 and secured on the outside face with a metal cleat (see Article 13.3.2.1., “General Requirements for Linear Metal Flashings”).  Gasketed screw fasteners shown on the inside face of the flashing.
 
−
;(4) [[SBS Roof Systems Standard#PART_13|'''Securement cleat''']]:
 
−
:Ref. Drawing (A).
 
−
;(5) [[SBS Roof Systems Standard#PART_13|'''Counter-flashing''']]:
 
−
:Required if membrane on inside surface of parapet is not protected from UV light (granule-surfaced membrane is considered UV resistant; Ref. Drawing (B)).  The illustrated flashing underlaps the cap flashing and is secured to the inside face of the parapet with S-locked seams and additional gasketed fasteners; all fasteners must be located at least 88.9 mm (3-1/2”) above the ''finished roof system surface''.  Counter-flashing may be removed for future sheet membrane renewal.
 
  
−
;(6) '''Machine direction''':
+
=== RELATED WORK BY OTHERS ===
−
:Membrane oriented in the direction of manufacturing.
+
;(A) [[SBS Roof Systems Standard#PART_2|'''Acceptable deck''']]
  
 
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Revision as of 16:41, 31 October 2022



Division D - Construction Details

SBS | Parapet (Typical) ( Article 10.3.2.3.; Article 10.3.4.1.)

Notice to Reader
Images used in a Construction Detail are representative and not prescriptive, and are not necessarily drawn to scale. They are intended to support the related Standard (Ref. Division A, Article 2.2.1.2.).

The reader may link to the related Article in the detail title, or link to the Standard as it relates to a specific element in the detail. All hyperlinks are displayed blue text.

SBS Details

Use arrows to scroll through related images (A, B, and C). Click any image to expand.

  • Drawing A

  • Drawing B

  • Drawing C

1 WORK INCLUDED

(1) Control Joint (Roof Divider)
Typically framed with dimensional lumber and plywood on site by the Contractor, or by others (as specified). Insulated control joint shown in Drawing (C). See Article 10.1.6.2. concerning permissible design heights for control joints.
(2) Base sheet membrane flashing
Fully envelope the control joint to ensure water-tightness on all sides. The base membrane flashing also separates metal cap flashing (when specified) from any organic substrates (plywood, dimensional lumber).
(3) Cap sheet membrane flashing
Installed as required in Part 10 and applied as the second or third of a multi-ply membrane system, providing required coverage above the finished roof system surface (note that the required minimum coverage may be reduced when the joint is fully enveloped with two plies of membrane flashing (see illustration).
When the height of the control joint exceeds 203.2 mm (8”) (Ref. Drawing (C)), no fewer than two plies of sheet membrane flashing shall be carried up at least 203.2 mm above the finished roof system surface.
(3) Metal Cap Flashing
Required only when the low control joint (less than 203.2 mm (8”) in height) is not fully enveloped with at least two plies of sheet membrane flashing. Cap flashing must be designed and installed as required in Part 13.
Note that the cap flashing is sloped at least 2% (mono slope illustrated) when the width of the flashing exceeds 101.6 mm (4”) (Ref. Article 13.1.3.6., “Cap Flashing, Counter-flashing, and Reglet Flashing”).
Fasteners used to secure metal flashing must be at least 88.9 mm (3-1/2”) above the finished roof system surface.

2 RELATED WORK BY OTHERS

(A) Acceptable deck

NOTE: See the Standard for additional requirements.

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