Which wrap is specified for protecting underground cellular glass installations?

• A. Pitt wrap
• B. Foam wrap
• C. Plastic film
• D. Foil tape

Answer: (A)

Protection of underground cellular glass insulation relies on a durable, moisture-resistant wrap that can withstand soil and backfill conditions. Pitt wrap is an asphalt-impregnated protective wrap designed for this purpose, providing abrasion resistance and a moisture barrier to keep the insulation dry and intact in the trench. This specific wrap is specified because it stays in place through burial, seals around the insulation, and shields it from damage during backfilling.

Foam wrap isn’t durable enough for underground use and can compress or degrade, breaking the protective barrier. Plastic film may tear or fail under soil pressure and doesn’t offer the needed mechanical protection. Foil tape is an adhesive seal, not a full protective jacket, and cannot substitute for a proper wrap around the insulation in burial conditions.