IPVMU Certified | 07/21/14 06:17pm
1. It does not appear you have enough mounting surface to use that parapet mount. You'll need an area ~16"x12", and it appears that you might have 4"?
2. Parapets have a max weight rating (for the PP450 it is 45 lbs), however that is for safety, not necessairly picture quality. Even if all three cameras weigh less than 45 pounds, the picture may shake or buffet in the wind.
In this case, using a tripod mount might be a better option, both in terms of installability and stable picture quality, ie:
Thanks Brian, at what point do you start worrying about height and grounding (i.e. lighting) when placing the cameras off the tripod. Have you had a lot of success with this style of mounting?
Cliff, We have had several installs with this type of challenge. The way we solve this is with plate steel in the form of a large "L" bracket or sled. 1/4" plate with several gussets works really well. We use (2) 24 x24" plates joined at 90 deg., (think shelf-shaped). The shape can be modified but there are some things to remember.
- Weight keeps it stationary (sandbags hold down the bottom piece)
- Rigidity mitigates wind vibration (thats what the gussets are for)
- Safety cables to keep it all on the roof just in case a freak tornado or vandal shows up.
Ground as normal. The parapet mount is no different attractor of lightning that any other protruding bits on a roof.
Drill and mount with quality fasteners.
Lastly, keep the building engineer in the loop on this. You want that person as an ally not an enemy to this type of project. Involve them early and ask for help in implementing such an idea. Maybe they would like to fabricate and paint the new bracket?
Does the client know you are goin to mount the parapet mount on the face of his building? If so make sure you use stainless steel fastners. Nothing like rust rivers down a building to make a client happy.
I would avoid mounting anything on the membrain roof, it is expensive to repair.
I would assemble a pipe with 1 quad and 4 T's. The quad attaches to the parapet mount. The quad has 3 openings left. the bottom one gets the PTZ, the one on the right gets a short pipe with a 90 deg elbow the left gets the same. The two fixed cameras hang off the right and left 90deg elbows.
Here is a sketch.
I would attack it the same way as Brian, but with a different product; communications style non-penetrating roof mount.
Much more stable than a tripod, and you can find them with an offset mast so it can be right up to the edge of the roof, and then just use pole mount adapters for the cameras.
Worst part is carrying cement blocks up to the roof...
Norris, Inc., S. Portland, ME
We use non-penetrating roof mounts a lot. You can get them with mat at tessco for about 150 bucks each. The one problem you would face is that you generally can not view along the walls of the building. Keeps you from liability with the membrane and service is a snap. Normally come with 4 x 4 sled and 5 foot 2.5 inch pole.