How to Choose the Right Insulation for Your Renovation Project

Creaky timber floors that let the cold in like a welcome mat. Walls so thin you can hear your neighbour’s kettle boil. A roof cavity full of dust and who-knows-what from the 1970s.

Renovating an older Melbourne home usually means discovering a few surprises, and insulation (or the complete lack of it) is often one of them.

That’s why choosing the right home insulation is one of the smartest decisions you’ll make during your reno. It doesn’t just keep you warm in winter and cool in summer, it also makes your house quieter, more energy efficient, and cheaper to run.

In this guide, Plaster Wholesalers walks you through the smartest insulation types to use, how to match them to different areas of your home, and the trusted renovation insulation brands Melbourne builders rely on.

Why insulation deserves a spot in your reno plan

When you’re building from scratch, insulation is a no-brainer.

But in a renovation, it often depends on what’s accessible or what’s already there. That’s why it’s important to make insulation part of your planning process early on.

The benefits go beyond warmth in winter. With the right renovation insulation, you can:

• Cut heating and cooling costs by up to 45%
• Block out external noise
• Minimise indoor temperature swings
• Improve indoor air quality
• Meet new 7-star energy efficiency requirements

And if your renovation includes extending the building envelope, it may trigger insulation upgrades under the NCC.

Know the main types of home insulation

Let’s keep it simple. Most insulation types used in home renovations fall into one of three categories:

1. Bulk insulation

This is your typical batts, blankets or loose-fill material that traps air in its structure to resist heat flow. It’s rated by R-value and ideal for ceilings, walls and underfloor.

2. Reflective insulation

Usually made of foil-lined materials, reflective insulation bounces radiant heat away. Great for roof spaces and areas with strong sun exposure.

3. Composite insulation

Some products combine bulk and reflective properties, like foil-backed blankets. These are ideal in hard-to-access or high-performance areas.

Match insulation to your renovation zone

Not all home insulation performs the same across different parts of the house, and not all renovation types allow for the same upgrades. Here’s what to consider:

Ceiling upgrades

If you’re replacing plasterboard or working on roof access, this is the time to boost ceiling insulation. Aim for R5.0 or R6.0 if you’ve got the cavity space.

Wall cavities

Open stud walls make it easy to slot in new batts. Go for at least R2.5 bulk insulation if you’re redoing internal or external walls.

Underfloor spaces

Timber floors on stumps are notorious for winter chills. Retrofitting underfloor batts can make a big difference in comfort and efficiency.

Bathrooms and laundries

Use water-resistant batts and consider acoustic insulation to block noise from washing machines, dryers and plumbing.

Choose a trusted insulation brand

Whether you’re after thermal or acoustic home insulation, the right brand makes all the difference. At Plaster Wholesalers, we stock leading brands like:

• Bradford Insulation – Known for their Gold and Soundscreen ranges, Bradford offers top-tier thermal and acoustic batts backed by decades of Australian performance testing.
• Knauf Insulation – Designed for easy handling and low dust, Knauf’s Earthwool batts are ideal for renovators and DIYers who want performance without irritation.

Both are stocked in a range of sizes, R-values and applications, ready to be picked up or delivered from our Somerton and Hoppers Crossing locations.

Think about installation

DIY or professional? For ceiling and wall batts, many experienced renovators can manage the install themselves with gloves, a utility knife and proper safety gear. But if you’re working with old insulation, restricted roof cavities or dealing with moisture problems, it’s worth calling in the pros.

And don’t forget, squashing insulation reduces its effectiveness. Always allow it to fully expand and follow manufacturer guidelines.

Bonus tip: don’t forget acoustic insulation

Thermal performance gets all the attention, but soundproofing is just as important, especially in multi-room homes or townhouses.

If you’re renovating a home office, rumpus room or media room, acoustic batts can make a big difference. Products like Bradford Soundscreen or Knauf Acoustic batts reduce sound transfer between rooms and floors, creating quieter, more liveable spaces.

Final checks before you buy

To make sure you’re choosing the right home insulation for your renovation project, always check:

• R-values for your climate zone (Melbourne typically requires R2.5+ for walls and R5.0+ for ceilings)
• Cavity size to ensure a proper fit without squashing
• Fire safety ratings if you’re insulating near electricals or recessed lighting
• Moisture resistance in wet areas like bathrooms and laundries
• NCC compliance, especially if you’re extending or changing building use

Get it sorted with Melbourne’s trusted trade supplier

At Plaster Wholesalers, we’ve helped thousands of builders, renovators and project managers find the right insulation for their needs. Whether you’re after budget-friendly batts or high-performance thermal and acoustic products, we’ve got you covered.

Visit us in Hoppers Crossing or Somerton, or give our expert team a call. We’ll help you choose the best product, get it delivered, and keep your renovation on track.