ro_dlg.dcl — Roof Features Configuration¶

File: ro_dlg.dcl
Version: v3.60
Category: Dialog Definitions
Size: 7.1 KB (215 lines)

Note

Roof/Parapet Features

Configure roof-related features including parapet walls, coping, drains, scuppers, cant strips, and roof penetrations for complete roof panel detailing.

Functional Purpose¶

Roof Features - Configures all roof-related elements on panels: parapets, coping caps, roof drains, scuppers, cant strips, and penetrations for complete weatherproofing and drainage.

Key Functions:

Creates parapet walls (height, thickness, coping details)
Positions roof drains (internal drainage points)
Adds scuppers (overflow drainage through parapet)
Defines cant strips (45° concrete fillet at base of parapet)
Configures coping (protective cap on parapet top)
Manages penetrations (roof hatches, vents, equipment curbs)

User Need¶

Roof features for:

Parapets (roof edge walls for safety, aesthetics, drainage control)
Drainage (prevent water ponding, structural damage, leaks)
Weatherproofing (protect roof membrane, prevent wind uplift)
Code compliance (guardrail height, drainage requirements)
Aesthetics (coping profiles, architectural appearance)

Typical Workflow¶

1. User in mp_dlg clicks [Roof] button
2. ro_dlg opens
3. User enables parapet:
   • Height: 3'-6" (42" code minimum guardrail height)
   • Thickness: 6" (same as panel)
   • Location: Top of panel (all 4 edges)
4. User adds coping:
   • Type: Precast concrete coping (matches panel)
   • Profile: Sloped top (water runoff)
   • Width: 8" (covers 6" parapet + overhang)
   • Drip edge: 1" overhang with groove
5. User positions roof drain:
   • Type: 6" diameter cast-iron drain
   • Location: 3'-0" from corner (low point)
   • Sump: 1" deep depression around drain
6. User adds scupper (overflow):
   • Size: 4"×6" opening through parapet
   • Location: Opposite corner from drain
   • Elevation: 2" above roof surface
   • Purpose: Emergency overflow if drain clogs
7. User adds cant strip:
   • Height: 4"
   • Base: 4" (45° angle)
   • Location: At base of parapet (all edges)
   • Purpose: Transition for roof membrane
8. User clicks OK
9. Roof features drawn on panel elevation

Control Semantics¶

Parapet Configuration¶

Parapet Enable:

rop - Parapet toggle (enable/disable)

Parapet Dimensions:

roph - Parapet height:
- Code minimum: 42” (3’-6”) for guardrail
- Typical: 42”-48” (3’-6” to 4’-0”)
- Tall: 60”+ (5’-0”+) for architectural effect
- HVAC screen: 8’-10’ (hide rooftop units)
ropt - Parapet thickness:
- Matches panel: 6” typical
- Increased: 8”-10” for tall parapets (lateral stability)
- Tapered: Thicker at base, thinner at top
rope - Parapet edges:
- All edges (typical for perimeter panels)
- Selected edges only (interior panels)
- Front edge only (facade parapet)

Coping¶

Coping Type:

roc - Coping material/type:
- Precast concrete (matches panel, most common)
- Metal (aluminum, steel - economical)
- Stone/granite (high-end)
- None (roof membrane wraps over, not recommended)

Coping Profile:

rocp - Profile shape:
- Sloped top (most common):
  - 15° to 30° slope for water runoff
  - Prevents standing water
- Flat top:
  - Cheaper but water pools
  - Not recommended
- Beveled:
  - Both sides sloped (center peak)
  - Aesthetic, self-cleaning
- Custom profile

Coping Details:

rocw - Coping width:
- Minimum: Parapet width + 1” overhang each side
- Typical: 8”-12” (6” parapet + 2” overhang)
roco - Overhang:
- 1”-2” typical (drip edge)
- Prevents water running down face
rocd - Drip groove:
- 1/4” × 1/4” groove on underside
- Breaks water surface tension
- Prevents water from tracking back

Drainage¶

Roof Drains:

rod1 through rodN - Drain positions (up to 16)

Per Drain:

rodsize1 - Drain size:
- 4” diameter (minimum, light duty)
- 6” diameter (standard)
- 8” diameter (heavy flow, large roofs)
rodx1, rody1 - Drain position (X, Y coordinates)
rods1 - Sump depth:
- 1”-2” (collects water at drain)
- Radius: 2’-3’ around drain
- Sloped surface to drain

Scuppers (Emergency Overflow):

rosc1 through roscN - Scupper openings

Per Scupper:

roscw1 - Scupper width: 4”-6” typical
rosch1 - Scupper height: 4”-8” typical
rosce1 - Scupper elevation:
- 2”-4” above roof surface
- Higher than drain (overflow backup)
- Code: Required if primary drain can clog

Cant Strips¶

Cant Configuration:

roca - Cant strip enable
rocah - Cant height:
- 4” typical (45° angle)
- 6” for steep membrane transition
rocab - Cant base width (equals height for 45°)
rocae - Cant edges:
- At parapet base (all edges with parapet)
- At equipment curbs
- At penetrations

Penetrations¶

Roof Penetrations:

rop1 through ropN - Penetrations (hatches, vents, etc.)

Per Penetration:

ropt1 - Penetration type:
- Roof hatch (access)
- Vent pipe (plumbing, HVAC)
- Equipment curb (HVAC unit, exhaust fan)
- Skylight opening
rops1 - Size (diameter or width × length)
ropx1, ropy1 - Position
ropcurb1 - Curb height (if required):
- 6”-12” typical
- Raises equipment/hatch above roof surface
- Prevents water entry

Engineering Considerations¶

Parapet Height Requirements¶

Building Codes (IBC):

Roof with access (occupied): 42" minimum guardrail height
Roof without access: 30" minimum (some jurisdictions)
OSHA (construction safety): 42" minimum for worker protection

Most common: 42"-48" (3'-6" to 4'-0")
Satisfies all code requirements

Drainage Sizing¶

Drain Capacity:

Roof area per drain:
Based on rainfall intensity and roof area

Example:
Roof area: 2,000 SF
Rainfall: 4" per hour (100-year storm)
Runoff: 2,000 SF × 4"/hr = 8,000 SF-in/hr

6" drain capacity: ~10,000 SF-in/hr
OK - adequate capacity

Rule of Thumb:
1 drain per 1,000-2,000 SF (verify with calculations)

Scupper Sizing:

Purpose: Emergency overflow if drain clogs
Required flow: 100% of primary drain capacity
Size: Typically 4"×6" or 6"×8"

Number: Minimum 2 scuppers (redundancy)
Location: Opposite corners from drains

Coping Attachment¶

Connection Methods:

Cast-in reglets:
- Metal channel cast into parapet top
- Coping slides into reglet
- Sealed with elastomeric sealant

Through-bolts:
- Stainless steel bolts through coping and parapet
- Countersunk and sealed
- Strong but visible

Adhesive + mechanical:
- Construction adhesive
- Supplemented with pins or clips
- Clean appearance

User Example¶

Scenario: Commercial building roof panel with parapet

1. Panel: 20'×8' roof deck panel
2. Parapet:
   • Enable: Yes (all 4 edges)
   • Height: 3'-6" (42" - code minimum)
   • Thickness: 6"
3. Coping:
   • Type: Precast concrete
   • Profile: Sloped top (15° slope)
   • Width: 8" (6" parapet + 1" overhang each side)
   • Drip groove: 1/4"×1/4" underside
4. Drainage:
   • Roof drain: 6" diameter
   • Location: 3'-0" from northwest corner
   • Sump: 1" deep, 3' radius
5. Overflow:
   • Scupper 1: 4"×6", southeast corner, 3" above roof
   • Scupper 2: 4"×6", southwest corner, 3" above roof
6. Cant Strip:
   • Enable: Yes (all parapet bases)
   • Height: 4"
   • Base: 4" (45° angle)
7. Penetrations:
   • Roof hatch: 3'×3', center of panel
   • Curb height: 8"
8. Result: Complete roof panel with code-compliant parapet, drainage, weatherproofing

Integration¶

Called By: mp_dlg ? [Roof] button Drawing: Roof features drawn on panel elevation and plan views

Variables:

parapet-height, parapet-thickness, parapet-edges
coping-type, coping-profile, coping-width
drains[] - Array of drain locations/sizes
scuppers[] - Array of scupper openings
cant-strip-enable, cant-height
penetrations[] - Roof penetrations

Best Practices¶

Parapet Design:

? 42” minimum height (code compliance)
? Adequate thickness (6” minimum for 42” height)
? Reinforce parapet (lateral wind loads)
? Add coping (protect concrete, aesthetics)

Drainage:

? Minimum 2 drains per panel (redundancy)
? Add scuppers (emergency overflow)
? Slope roof to drains (1/4” per foot minimum)
? Size drains for 100-year storm

Coping:

? Overhang both sides (drip edges)
? Add drip groove (prevent water tracking)
? Slope top surface (water runoff)
? Secure attachment (wind uplift resistance)

Common Mistakes:

? Parapet too short (<42” - code violation)
? No scuppers (drain clogs = water backup)
? Flat coping (water pools, ice forms)
? No cant strip (roof membrane tears at corner)

Documentation Metadata¶

Enhancement Status: ? COMPREHENSIVE - ENHANCED [6/8]

End of Document