Difference between revisions of "SBS Control Joint (Roof Divider)"

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Difference between revisions of "SBS Control Joint (Roof Divider)"

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=== WORK INCLUDED ===
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(1) <b>Gypsum Underlayment:</b> If required by design authority.
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<big><big>Division D - Construction Details</big></big>
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<big><big><big><big><big>SBS | Control Joint (Roof Divider) ([[SBS_Roof_Systems_Standard#10.3.2.3._General Application Requirements for Perimeters and Walls | Article 10.3.2.3.]]; [[SBS_Roof_Systems_Standard#10.3.4.1._Parapets | Article 10.3.4.1.]])</big></big></big></big></big>
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<div class="panel-heading"><big>'''SBS Details'''</big></div>
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(3) <b>Insulation:</b> See list of accepted materials in Section 2.2.
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Use arrows to scroll through related images (A, B, and C).  Click any image to expand.
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<gallery mode="slideshow" showthumbnails>
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Image:Part 10 - SBS Control Joint (Roof Divider) - A.png | Drawing A
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Image:Part 10 - SBS Control Joint (Roof Divider) - B.png | Drawing B
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Image:Part 10 - SBS Control Joint (Roof Divider) - C.png | Drawing C
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(4) <b>Insulation Overlay:</b> Where required. See <i>RGC Guarantee Standard B4.1, B4.2 </i>and<i> C4.1</i>
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(5) <b>Primary Membrane and Membrane Protection</b>
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=== WORK INCLUDED ===
  
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(6) <b>Membrane Flashing:</b> Lap over top and mechanically fasten.
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;(1) [[SBS Roof Systems Standard#PART_10|'''Control Joint (Roof Divider)''']]:
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:Typically framed with dimensional lumber and plywood on site by the Contractor, or by others (as specified).  Insulated control joint shown in Drawing (A).  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.
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;(2) [[SBS Roof Systems Standard#PART_10|'''Base sheet membrane flashing''']]:
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: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).
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;(3) [[SBS Roof Systems Standard#PART_10|'''Cap sheet membrane flashing''']]:
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: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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(7) <b>Metal Base Flashing: </b>Mechanically fasten to top of wood blocking. Optional on flexible membrane systems. Required on assemblies using gravel ballast filter mats. See <i>RGC Guarantee Standard A6.9.</i>
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:When the height of the control joint exceeds 203.2 mm (8”) (Ref. Drawing (A)), no fewer than two plies of sheet membrane flashing shall be carried up at least 203.2 mm above the ''finished roof system surface''.
  
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(8)<b> Metal Cap Flashing:</b> Flashings
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;(3) [[SBS Roof Systems Standard#PART_13|'''Metal Cap Flashing''']]:
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: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]].
  
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(7) and (8) may be one piece.
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: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”]]).
  
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=== RELATED WORK BY OTHERS ===
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:Fasteners used to secure metal flashing must be at least 88.9 mm (3-1/2”) above the finished roof system surface.
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(A) <b>Acceptable Deck</b>
 
  
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(B) <b>Control Joint Assembly:</b> Required to separate new systems from existing roof systems and at dissimilar roof decks or on BUR assemblies over 45 m x 45 m (150&#8217; x 150&#8217;). See <i>RGC Guarantee Standard Section A1.4</i> and <i>Section B1.3.</i> Primed where applicable. Slope top if wider than 100 mm (4").
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(C) <b>Existing Roof Assembly: </b>If applicable. Prepared for application of membrane flashing at control joint.
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=== RELATED WORK BY OTHERS ===
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;(A) [[SBS Roof Systems Standard#PART_2|'''Acceptable deck''']]
  
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'''NOTE''': Refer to <i>RGC Guarantee Standards</i> for additional requirements.
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'''NOTE''': See the [[SBS Roof Systems Standard | '''Standard''']] for additional requirements.
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Latest revision as of 22:07, 23 August 2024



Division D - Construction Details

SBS | Control Joint (Roof Divider) ( 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 (A). 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 (A)), 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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