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System guide

Insulation bags & pillows

Loose-filled fabric pillows stuffed with fibre — the budget cousin of engineered covers: no pattern, just a bag wired around the component.

Where it belongs

When this is the right system

Quick fixes and one-offs. Honest assessment: cheaper upfront than engineered covers, but fit is approximate (gaps = hot spots), no defined closure, and they rarely survive removal — most are single-use in practice. For components opened more than once, an engineered, snap-closed cover pays for itself.

Standard: no dedicated standard — quality varies wildly by fabricator; ASTM C1695 covers the engineered category.

FAQ

Questions on this topic

What is a insulation bags & pillows system?
Loose-filled fabric pillows stuffed with fibre — the budget cousin of engineered covers: no pattern, just a bag wired around the component.
When should I use insulation bags & pillows?
Quick fixes and one-offs. Honest assessment: cheaper upfront than engineered covers, but fit is approximate (gaps = hot spots), no defined closure, and they rarely survive removal — most are single-use in practice. For components opened more than once, an engineered, snap-closed cover pays for itself.
Which standard governs it?
no dedicated standard — quality varies wildly by fabricator; ASTM C1695 covers the engineered category.