Glasswool VS Polyester (the straight answer)
We install two types of ceiling insulation:
Glasswool Batts
It's proven, cost effective and available in high R-values. The go-to option for most ceiling insulation jobs.
Polyester Blanket
It's durable, moisture resistant and performs consistently long-term (no settling/compaction).
But premium doesn't always mean "best for your home". Blanket products suit some situations perfectly and look mint — but in older or irregular ceilings, they can be awkward and involve too much cutting to justify the extra spend. This is especially the case when you have no existing insulation.
In these situations, we recommend a hybrid system: glasswool between joists + polyester blanket over the top. It's a high performance result without wasting money.













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