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Frequently Asked Questions
Why is a curb built to a specific unit?
Its openings must align with the unit's connections.
Footprint and internal divisions come from the model.
Manufacturers publish a curb drawing for each.
An approximate size seals to nothing.
Choose the unit before ordering the curb.
It is not a stock item in that sense.
What sets curb height?
The roofing system, not preference.
The covering turns up the curb side.
It must terminate above the water line.
Insulation thickness raises that line.
Well-insulated roofs need taller curbs.
Confirm with the roofing contractor.
What happens if the curb is too short?
Water finds its way in at the upstand.
The covering cannot terminate high enough.
Correction is a roofing operation, not a mechanical one.
That means opening the roof again.
It is the classic expensive error.
Check the height before fabrication.
Why does a sloping roof need a tapered curb?
The unit must sit level.
A sloping roof means each side differs in height.
A tapered curb corrects for it.
A square curb on a slope drains wrongly.
It also stresses the unit's base.
State the slope when ordering.
Does the curb need insulating?
Yes, and it is sometimes omitted.
An uninsulated curb bridges the roof thermally.
Condensation forms on the inner face.
That drips inside the building.
Insulated curbs are standard for good reason.
Match insulation to the roof build-up.
What is the wood nailer for?
Terminating the roofing membrane.
Roofers fix the covering to it.
Its position sets where the membrane ends.
Different roofing systems expect different details.
Confirm the requirement before fabrication.
Some systems use alternative terminations.
What should be checked before ordering?
Structural capacity for the unit's weight.
The roof warranty position on penetrations.
Slope, roofing system and insulation depth.
The unit make and model.
Access and lifting route to the position.
All of it before fabrication, not after.