6 FAQs about Waterproofing on roof photovoltaic panels

How much does it cost to waterproof a rooftop solar system?

Improperly waterproofing a rooftop solar system is expensive. The labor costs to repair smaller leaks often range between $500 and $1,000. If the problem is bigger, flashed mounts or the whole roof may need replaced.

Can solar roof attachments cause water intrusion?

Installing solar roof attachments requires drilling dozens of holes through roofing material, making any roof vulnerable to water intrusion. Given this reality, it's important to understand how water intrusion (and the resulting building damage) occurs and ways installers can prevent it from happening.

What is the best roofing sealant for solar panels?

Asphaltic roofing cement (mastic) with reinforcing mesh is a code approved method for sealing underlayment flashings below tile, and it is also used as sealant on shingles, but most solar installers rely on roofing sealants like those from Chemlink and Geocel. These synthetic sealants can provide decades of performance when properly applied.

How do you prevent roof leaks?

Two basic strategies exist for eliminating the risk of leaks on roofs: “water-proofing” and “water-shedding.” Roofs with a pitch below 2:12 (low-slope roofs) will use waterproofing membranes. The two common types are asphaltic “built-up-roofing” or “single ply membranes” made from plastic or rubber sheets.

How do waterproof membranes work?

Waterproof membranes work by sealing every seam, crack and crevice. This roofing method results in a watertight membrane that protects in the heaviest rains, even when ponding occurs, for 20 to 30 years. These roofing systems require a qualified roofer to seal every penetration, taking great care for long-term reliability.

What is elevating the water seal on a roof?

Elevating this critical barrier is one of the key elements to reliable, long-term waterproofing. On low-slope roofs, this is accomplished by sealing the base of the flashing to the membrane and elevating the sealing area above the flood line. On steep-slope roofs, elevating the water seal has major advantages.

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