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

Jump to: navigation, search

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

(→‎WORK INCLUDED)
 
(3 intermediate revisions by the same user not shown)
Line 8: Line 8:
 
<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>
 
<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>
 
{{Template:Construction Details Header}}
 
{{Template:Construction Details Header}}
−
<div class="panel panel-success">
+
<div class="panel panel-info">
 
<div class="panel-heading"><big>'''SBS Details'''</big></div>
 
<div class="panel-heading"><big>'''SBS Details'''</big></div>
 
<div class="panel-body">
 
<div class="panel-body">
Line 14: Line 14:
 
<br>
 
<br>
 
<div style="text-align:center; vertical-align:center">
 
<div style="text-align:center; vertical-align:center">
−
[[File:Part 10 - Construction Detail - Control Joint - SBS 1.png| link=https://rpm.rcabc.org/images/4/40/Part_10_-_Construction_Detail_-_Control_Joint_-_SBS_1.png | Drawing A | class=img-responsive]]
+
[[File:Part 10 - Construction Detail - Control Joint - SBS 1.png | thumb | 700px | link=https://rpm.rcabc.org/images/4/40/Part_10_-_Construction_Detail_-_Control_Joint_-_SBS_1.png | '''Drawing A''']]
  
−
[[File:Part 10 - Construction Detail - Control Joint - SBS 2.png| link=https://rpm.rcabc.org/images/8/89/Part_10_-_Construction_Detail_-_Control_Joint_-_SBS_2.png | Drawing B | class=img-responsive]]
+
[[File:Part 10 - Construction Detail - Control Joint - SBS 2.png| thumb | 700 px | link=https://rpm.rcabc.org/images/8/89/Part_10_-_Construction_Detail_-_Control_Joint_-_SBS_2.png | '''Drawing B''']]
 
</div>
 
</div>
  
Line 25: Line 25:
  
 
;(1) [[SBS Roof Systems Standard#PART_10|'''Control Joint (Roof Divider)''']]:  
 
;(1) [[SBS Roof Systems Standard#PART_10|'''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 [[SBS_Roof_Systems_Standard#10.1.6.2. Control Joints (Roof Dividers) |  Article 10.1.6.2.]] concerning permissible design heights for control joints.
+
:Typically framed with dimensional lumber and plywood on site by the ''Contractor'', or by others (as specified).  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).
 
  
−
: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''.
+
:Two models are illustrated here.  A ''control joint'' may be as low as 101.6 mm (4”), shown in '''Drawing B''', provided it is not capped with a ''linear metal flashing''.  If a metal cap flashing is specified, the minimum height of the ''control joint'' must be 127 mm (5”), shown in '''Drawing A''', and screw fasteners securing the cap flashing must be kept at least 88.9 mm (3-1/2”) above the ''finished roof system surface''.
 +
;(2) [[SBS Roof Systems Standard#PART_10|'''Roof membrane''']]:
 +
:Carried up and over the top of the ''control joint'' as stated above. Membrane flashing is required for ''control joints'' when the membrane is “SBS”.
 
;(3) [[SBS Roof Systems Standard#PART_13|'''Metal Cap Flashing''']]:
 
;(3) [[SBS Roof Systems Standard#PART_13|'''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 [[SBS_Roof_Systems_Standard#PART_13 | Part 13]].  
+
:Cap flashing may be employed for protection of the waterproofing, and must be designed and installed as required in [[SBS Roof Systems Standard#PART_13 | 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. [[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”]]).
 
: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”]]).
 +
 +
:Fasteners used to secure metal flashing must be at least 88.9 mm (3-1/2”) above the ''finished roof system surface''.
  
 
<hr>
 
<hr>

Latest revision as of 19:49, 12 November 2025



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


Drawing A
Drawing B

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). See Article 10.1.6.2. concerning permissible design heights for control joints.
Two models are illustrated here. A control joint may be as low as 101.6 mm (4”), shown in Drawing B, provided it is not capped with a linear metal flashing. If a metal cap flashing is specified, the minimum height of the control joint must be 127 mm (5”), shown in Drawing A, and screw fasteners securing the cap flashing must be kept at least 88.9 mm (3-1/2”) above the finished roof system surface.
(2) Roof membrane
Carried up and over the top of the control joint as stated above. Membrane flashing is required for control joints when the membrane is “SBS”.
(3) Metal Cap Flashing
Cap flashing may be employed for protection of the waterproofing, and 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.

Back to "SBS" Roof System Details

Home

© RCABC 2025
RoofStarTM is a registered Trademark of the RCABC.
No reproduction of this material, in whole or in part, is lawful without the expressed permission of the RCABC Guarantee Corp.

Retrieved from "http://rpm.rcabc.org/index.php?title=SBS_Control_Joint_(Roof_Divider)&oldid=53021"