How Far From A Metal Roof Should A Hexbeam Be

Planning my first stationary antenna for 2 6 meters.

How far from a metal roof should a hexbeam be.

The 20 000 plus ampere current of a lightning bolt discharging to ground. The sheet metal in this type of roofing can be penetrated by heavy falling limbs or dented by. Because the metal panels run unhindered from the top to the bottom of the roof not only are there no horizontal seams but in total the roof has far fewer seams. Some slight overhang is recommended in conjunction with a drip edge flashing to prevent water from getting under the roofing and onto underlying wood.

I m not too sure about your vertical question. A metal roof can withstand decades of abuse from extreme weather like high winds heavy snow hail storms and even wildfires. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. Correctly measure the spacing of furring strips for a metal roof to further decrease condensation.

However if most of your antenna is high and over the ground i don t think you need worry. 3 amount of disposable to do roof mods. The base station will be in my metal garage. A grounded metal roof is a more attractive target for lightning than one that is floating at atmospheric potential.

A typical metal roof overhang may be 2 to 4 inches or even less. It s probably better if the roof is not grounded as far as lightning protection is concerned. Maximum rafter spans for a patio roof in areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. 27 should be fine for 40m.

Metal is tough and durable but it s not impervious to all hazards. Metal roofing has a 140 mph wind rating meaning it can withstand wind gusts up to 140 miles per hour. Hopefully there will be others along shortly to offer you more helpful advice. If your metal roof has a slant it may act as a reflector and enhance signals in certain directions.

2 need a lot of structure mods to support antanna base. I can t put the antenna on the roof because 1 the roof panels aren t bonded for a ground plane. I m not exactly sure about the hex beam top to bottom distance perhaps 10 and your tower must be 25 to 30 tall which would leave approximately a 20 distance between the metal shed roof highest point and the wire elements of the antenna. Twenty four inches is a common spacing of furring strips for a metal roof.

Double the hill and valley width since this is the amount that the panel will overlap the one next to it on each side.