Underfloor insulation services across Auckland.

When installed properly, it takes the edge off the cold immediately. Floors feel noticeably warmer, the home feels less draughty, and your heating actually starts working for you instead of fighting the subfloor.

We install underfloor insulation across Auckland using polyester underfloor blanket. No sales pitch from a salesperson that’s never crawled a metre past the manhole. Straight advice from people doing the work backed by a quality and trusted install.

Underfloor insulation is famous for bad installs because no one can see it once it’s done. It’s far from glamorous work, but that’s why workmanship and reputation matter.

Polyester underfloor blanket (our preferred system)

We strongly prefer polyester blanket, because it’s the best all-round product for retrofit underfloor work. It’s durable, moisture resistant, and holds its shape long term. Underfloor insulation lives in a harsh environment — dampness, dust and the occasional rodent resident. Blanket polyester handles that better than most alternatives.

Installed properly, it’s a clean, consistent result that performs for decades. We stock a full range of R-values and widths. Underfloor insulation comes in different materials. On request we can touch up or install glasswool underfloor insulation. Whilst we’re happy to fix or replace polystyrene option we can’t install it as full solution.

Existing underfloor insulation (what we usually find)

A lot of properties already have something under the floor. The issue is most of it either doesn’t last well, wasn’t installed properly, or simply isn’t high-performing enough for long-term comfort.

Here are the most common types we come across:

Foil insulation (almost always needs replacing)

Foil insulation is common in 70’s-00’s homes. It relies heavily on reflection, so the shinier it is, the better it performs. The problem is it degrades over time, it gets dusty, dull, torn, and loses a lot of its effect. Less shine = less performance. We almost always recommend removing and replacing foil with a modern insulation solution.

Important: foil must be removed before installing new insulation.

Existing polyester blanket (usually R1.5)

This is one of the better things to find under a house. R1.5 polyester blanket is very common, often installed to a high standard and generally holding up well.

That said, there are higher performing options available. R2.0 is the current modern standard, and we can go higher again - which we often recommend for villas and older homes where comfort is a bigger issue.

Real talk though: the value of upgrading needs to make sense. Replacing decent existing polyester just for a performance bump is only justifiable it if the rest of the home’s energy efficiency has been prioritised (draft stopping, ceiling insulation, moisture control etc).

Polystyrene (EXPOL – commonly R1.4)

This is also common, usually white polystyrene sheets (around R1.4). It has its place, but it’s frequently associated with bits falling down and poor installation.

The main issue: older homes often have irregular joist spacings, bearer overlaps, and awkward sections that require a lot of “puzzle work”. When that puzzle work isn’t done properly, you end up with gaps and leaks which result in loss of performance.

Again, value matters. Sometimes it’s worth replacing, sometimes it isn’t - it depends on condition, access, and what outcome you’re chasing.