The Seven Steps
Rooftop Mechanical Units
Purpose
To secure rooftop mechanical units.
Caution
When anchoring to post-tensioned slab, locate and avoid reinforcing.
Recommendation
Install clips and blocking.
Supplies Required
- Clips, Z and L—1/8″ thick
- Lag bolts—3/8″ diameter (for wood)
- Sheet metal screws—No. 10 x 3/4″ (for steel)
- 4x blocking (for wood)
- Blocking—L2 x 2 x 3/8″ (for steel)
- Drive pins
- Framing clips (for wood) Simpson A35
Installation
To install blocking and clips for a wood roof, follow these steps:
- Insert 4x blocking between existing joists with framing clips.
- Attach Z or L clip to mechanical unit with corresponding fasteners and attach to blocking. Place clips at 24″ on center minimum.
- Patch roof as required.
To install blocking and clips for a steel roof, follow these steps:
- Insert blocking between existing joists and weld in place.
- Attach Z or L clip as mechanical unit with corresponding fasteners and attach to blocking. Position clips at 24″ on center minimum.
- Patch roof as required.
Mechanical Units with Blocking and Clips on a Wood Roof
Mechanical Units with Blocking and Clips on a Steel Roof
