Gravel Stop installation sequence
ANSI/SPRI/FM 4435/ES-1 edge system: 22 Gauge Cont Cleat, Strip-In Cover, 10' Lengths. 10" Face Max.
This sequence follows Drexel Metals' published installation guide for the system. The project's specifications, the approved shop drawings and the roofing membrane manufacturer's requirements govern; where they differ, follow them and ask AFS. Source: Drexel Metals, “Installation Guide For Gravel Stop”.
Step 1 of 5
Installing 22GA Galvanized Cleat
- Place the roof-side foot of the cleat squarely on the top edge of the treated wood nailing plate.
- Press the cleats firmly into position and nail through the pre-punched holes.
- At a miter, miter-cut the cleat into the corner as required to keep a continuous cleat line, then nail at a minimum 6" in each direction from the corner, or closer at special conditions.
As printed in the Drexel guide
“nail through the pre-punched holes with 1-1/4" S.S. Ring Shank Nails provided.”
Common mistakes this step guards against
- Do not break the cleat line at a corner - miter-cut it so the line stays continuous.
Parts, lettered as in the guide
- AGravel Stop 10'-0" Std. Lengths
- BSplice Plate 6" Lengths
- C22GA Galvanized Continuous Cleat 10'-0" Lengths
- DGravel Stop Miter (Outside Corner Shown)
- E1-1/4" S.S. Ring Shank Nail at 12" o.c. (6" from ends) (Included & Required)
- FPressure-Sensitive Cured Cover Strip (By Installer)
- GApproved Roofing Membrane (By Installer)
Field checklist
Gravel Stop - from Drexel's guide. Tick each item as it is done; print this page for the crew.
Common mistakes
Each line is the reverse of an instruction the Drexel guide states.
- Do not break the cleat line at a corner - miter-cut it so the line stays continuous. (step 1)
- Do not butt lengths tight - leave the 1/4" gap for thermal expansion. (step 5)
- Do not leave a joint without a splice plate. (step 5)
- Do not cut lengths that leave short sections next to each other. (step 5)
Notes printed on the guide
- Isolate all metal parts from ACQ-treated wood, or any other galvanically incompatible material, with an appropriate membrane.
- Appliance attachments - lightning rods, signs, antennae - that penetrate the water seal, set up a galvanic reaction or otherwise compromise the roof edge system are to be eliminated or isolated, per section 8.0 of ANSI/SPRI ES-1. Isolate appliances from the edge system or do not attach them to it; the lightning protection manufacturer gives the attachment instructions.
Printed on the section detail
- Face height 10" max. (Gravel Stop print approval DM-15476)
- 1-1/4" S.S. Ring Shank 12" on center through pre-punched hole
Drexel published ratings
Sustained pressure as Drexel publishes it (Drexel Metals DM-19063 "ES-1_GT-1 Certification Program Product Line Card" 12.09.25). Design Engineer must apply the Factor of Safety.
| Cover | Face up to | Wall up to | Cleat | Sustained pressure |
|---|---|---|---|---|
| 24 gauge | 10" | - | 22 ga | -140 psf |
| .040 AL | 10" | - | 22 ga | -130 psf |
