180+ S-Line - Fascia construction and drop height detail - metal and concrete roof

Nov 1, 2026

Uploaded by Jiven

180+ S-Line fascia construction reference providing drop height and toe cut dimension tables for metal and concrete roof applications. Includes roof pitch inputs in degrees and soffit width dimensions, with corresponding drop heights (Dimension “A”) and toe cut (Dimension “C”). Drop height calculations are defined using fixed clearances and component heights, plus notes on conditional gable end detailing and when roof pitch over 35 degrees may require additional elements. Guidance points to an online drop height calculator for other pitch/width combinations.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages2

Reading Time5 min

AccessFree to download

Drop height and toe cut dimensions

Roof pitch table by soffit width

Calculation constants and construction notes

| Roof Pitch (Degrees) | Drop Heights (mm)—Dimension “A”(See notes at bottom of table) | | | | | Toe Cut (mm) Dimension “C” | | --- | --- | --- | --- | --- | --- | --- | | | Soffit Width (mm) -Dimension “B” | | | | | | | | 300 | 450mm | 600mm | 750mm | 900mm | | | 10.0 | 89 | 115 | 142 | 168 | 195 | 125 | | 12.5 | 103 | 136 | 169 | 203 | 236 | 126 | | 15.0 | 117 | 157 | 197 | 238 | 278 | 127 | | 17.5 | 131 | 178 | 226 | 273 | 320 | 127 | | 20.0 | 145 | 200 | 254 | 309 | 364 | 128 | | 22.5 | 160 | 222 | 284 | 346 | 408 | 128 | | 25.0 | 174 | 244 | 314 | 384 | 454 | 129 | | 27.5 | 189 | 267 | 345 | 423 | 502 | 129 | | 30.0 | 205 | 291 | 378 | 464 | 551 | 129 | | 35.0 | 237 | 342 | 447 | 552 | 657 | 129 | | 40.0 | 272* | 398* | 524* | 649* | 775* | 129* | | 45.0 | 311* | 461* | 611* | 761* | 911* | 128* | | Drop Height “A” is calculated assuming the following constants:
Soffitt clearance = 10mm ; Roof clearance = 10mm ; Rafter height = 90mm ; Purlin/Batten height = 45mm
* Depending on soffit/window height location, Gable end detail may require a change to a 70x45 outrigger and 70x45 Fly rafter.
NOTE: For different roof pitch’s and soffit widths, visit our online drop height calculator at:
[www.continuous.co.nz/fascia-panel/truss series/180-S-Line](www.continuous.co.nz/fascia-panel/truss series/180-S-Line) | | | | | | | | Roof Pitch (Degrees) | Drop Heights (mm)—Dimension “A”(See notes at bottom of table) | | | | | Toe Cut (mm) Dimension “C” | | --- | --- | --- | --- | --- | --- | --- | | | Soffit Width (mm) -Dimension “B” | | | | | | | | 300 | 450mm | 600mm | 750mm | 900mm | | | 15.0 | 91 | 131 | 172 | 212 | 252 | 101 | | 17.5 | 105 | 152 | 199 | 247 | 294 | 101 | | 20.0 | 119 | 173 | 228 | 282 | 337 | 101 | | 22.5 | 133 | 195 | 257 | 319 | 381 | 101 | | 25.0 | 147 | 217 | 287 | 357 | 426 | 101 | | 27.5 | 161 | 239 | 317 | 395 | 473 | 101 | | 30.0 | 176 | 262 | 349 | 435 | 522 | 100 | | 35.0 | 206 | 311 | 416 | 521 | 626 | 99 | | 40.0 | 239* | 365* | 491* | 617* | 743* | 97* | | 45.0 | 276* | 426* | 576* | 726* | 876* | 93* | | Drop Height “A” is calculated assuming the following constants:
Soffitt clearance=10mm ; Roof clearance=10mm ; Rafter height=90mm ; Batten height=45mm + 25mm packer on last batten=70mm * Roof pitch over 35 degrees may require a horizontal fascia return and boxed soffit at gable corners.
NOTE: For different roof pitch’s and soffit widths, visit our online drop height calculator at:
[www.continuous.co.nz/fascia-panel/truss series/180-S-Line](www.continuous.co.nz/fascia-panel/truss series/180-S-Line) | | | | | | |

FAQs

How do you find the drop height (Dimension A) for a given roof pitch and soffit width?

Select the roof pitch in degrees, then read the corresponding drop height values in the column for the required soffit width (Dimension B).

What constants are used to calculate the drop height (Dimension A)?

The table specifies assumed clearances and component heights, including soffit clearance, roof clearance, rafter height, and batten/fly rafter related heights; refer to the notes under the tables for the exact set used.

Why do some drop height and toe cut values have an asterisk (*)?

Asterisks indicate conditional adjustments based on soffit/window height location or gable end detail requirements, such as changes to outrigger and fly rafter dimensions or additional roof corner detailing.

Nov 1, 2026

Uploaded by Jiven