Engineered commercial drainage.

Why do commercial roofs need engineered drainage instead of standard gutters?

Commercial roofs shed far more water per linear foot than a house, so drainage has to be sized from the actual roof area, pitch, and valley concentrations — not picked off a shelf. Under-sized box gutters, clogged scuppers, and undersized downspouts are one of the most common causes of premature membrane failure and interior leaks on Twin Cities commercial buildings, because ponding water backs up under flashing and seams that were never designed to hold standing water.

We calculate drainage capacity from your roof's actual square footage and rainfall intensity data, then size box gutters, internal drains, and downspouts to move water off the roof faster than it accumulates.

• ✓6"–8" box gutters engineered to roof area, not guesswork
• ✓Internal roof drains and scuppers for low-slope membrane roofs
• ✓Downspout sizing that matches the actual load, not the building next door
• ✓Heated edge and ice-melt cable for entry awnings and valley areas
• ✓Drainage tied into your roof warranty requirements where applicable

What causes ice dams and ponding on commercial roofs?

Ice dams on commercial buildings form the same way they do on houses — heat escaping through the roof deck melts snow, which refreezes at unheated eaves, valleys, and rooftop equipment curbs, then backs up under the membrane or flashing. Ponding water is a separate problem caused by low slope, clogged drains, or a roof that has sagged slightly with age, and it accelerates membrane breakdown wherever water sits longer than 48 hours.

We address both by verifying drain and scupper capacity during every roof inspection and recommending heat cable or tapered insulation crickets where ponding is chronic rather than treating it as unavoidable.

Does insurance cover damaged commercial gutters and drains?

Yes — gutters, downspouts, scuppers, and fascia are soft components that adjusters check for hail impact, usually as part of a broader roof claim rather than a standalone one. Because drainage failure often causes secondary interior water damage, documenting the gutter and drain condition alongside the roof strengthens the overall claim.

We inspect drainage as part of every roof assessment and include it in the claim documentation when storm damage is present.