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Frequently Asked Questions
What is the decision these turn on?
Whether the roof may be pierced at all.
Non-penetrating supports sit on the membrane.
They rely on their own weight and friction.
The roof and its warranty stay intact.
Fixed supports bolt through to structure.
Each leg then needs a warranted detail.
Why is load spreading so important?
Roofs are sensitive to concentrated weight.
A small bearing area compresses insulation.
That leaves a permanent depression.
Depressions collect standing water.
Standing water is where roofs fail.
Pad area is part of the design.
How should wind uplift be handled?
By calculation, not assumption.
Equipment presents area to the wind.
Non-penetrating supports resist by mass alone.
Exposed sites need more ballast.
Roof edge zones are worse than the field.
Tall buildings need particular care.
What height should supports be?
More than the minimum anybody would pick.
Water and debris must pass underneath.
A roofer needs to work under them.
Too low traps debris and dams water.
That causes the failure it was meant to avoid.
Allow for future roof re-covering.
What can they carry?
Pipework, cable containment and small plant.
Condensing units and small fans.
Walkways and access platforms.
Anything without a roof opening beneath it.
Capacity varies widely between systems.
Check against the actual loaded weight.
When is fixing through unavoidable?
When mass alone cannot resist uplift.
Or where loads exceed non-penetrating capacity.
Tall exposed buildings often qualify.
Large equipment usually does.
Penetration details must be warranted.
Involve the roofing contractor early.
What maintenance do they need?
Checking pads and the roof beneath them.
Pads harden and migrate over years.
Debris accumulates against supports.
That dams water where it should drain.
Inspect during routine roof surveys.
Clear debris rather than leaving it.