Attics are often the most neglected rooms in the house, typically left as a spare storage unit or an area full of dust. Smart homeowners know that these extra roof spaces are not just afterthoughts; the attic holds great potential to become functional living spaces.

To maximise space leverage and efficiency, Australian attics are converted into a variety of useful spaces, including bedrooms, offices, libraries, and walk-in closets.

During the initial planning phase, you should know how to insulate an attic room. Besides compliance with building codes, insulation ensures your loft space is comfortable, moisture-proof, and energy-efficient.

How to Insulate an Attic Room: Understanding the Basics

Why Insulation is Vital to Attic Rooms

It is uncomfortable to stay in lofts without insulation since temperatures can fluctuate rapidly. The simple reason why it is obligatory to insulate attic spaces – regardless of whether it’s converted for enhanced storage or as a new living space – is to maintain a comfortable environment.

Insulation is a must if you are converting your attic into a bedroom, recreational space, office, or any area that people will frequent. While installing an HVAC system can help regulate internal temperatures, energy consumption bills will rise due to quick heat loss.

Types of Attic Insulation

There are various kinds of attic insulation, each with varying performance depending on the space:

  • Fibreglass Insulation – Also called glass wool insulation, it is one of the most common and affordable insulation materials. Fibreglass is considered the ideal insulation for attics because it is cost-effective, easy to install, durable, and has acoustic benefits and high thermal performance.
  • Acoustic Insulation – If you are more concerned with noise reduction, consider getting acoustic insulation. Possessing the thermal properties of other insulation types while reducing unwanted sound from your attic, acoustic insulation is perfect for properties located in noisy areas.
  • Polyester Insulation Batts – Polyester insulation batts are premium insulation that has no breathable particles, making them an outstanding option for people with allergies or asthma. This type of insulation is also the most effective at containing internal temperatures.
  • Reflective Foil Insulation – The radiant heat of the sun is often the biggest problem when regulating attic temperatures. To protect your attic room from strong sunrays, it is best to use radiant foil insulation. This type of insulation safeguards attics from the sun’s heat and controls moisture. It is also lightweight and easy to handle.Attic room


Insulating Attic Rooms: Step-by-Step

Acquire the Necessary Materials

Every renovation project starts with obtaining the needed tools and supplies. When insulating the attic walls, you must also secure proper PPEs to ensure a safe installation. Below is a comprehensive list of everything you might need:

Personal Protective Equipment (PPE)

  • Long-sleeved shirt and pants
  • Dust mask and goggles
  • Heavy-duty gloves
  • Cap or hat




  • Fire-blocking caulk
  • Foam sealant
  • Insulation material
  • Garbage bags
  • Plywood access panel
  • Self-adhesive weather seal
  • Aluminium flashing





  • Caulk gun
  • Tape measure
  • Ruler
  • Utility knife
  • Staple gun
  • Permanent marker
  • Rake
  • Box cutter
  • Notepad



Insulating Your Attic Step 1: Prepare the Attic

Your attic should be clean and free from clutter when working on insulation. Start by removing all items stored inside to create a space. Then, draw a basic outline of your attic on a notepad and mark any possible leaks.


Insulating Your Attic Step 2: Seal Any Air Leaks

Once you have identified all air leaks in the attic, seal them properly to prevent temperature loss. To close them, cut a batt and fold it over, place it at the bottom of a garbage bag, stuff it in the cavity, and then cover it with aluminium flashing. Finish it by caulking the sides.

Note: Air leaks are commonly found in dropped soffits, windows, pipes, exhaust fans, wiring holes, ducts, and furnace flutes.


Insulating Your Attic Step 3: Cut and Install the Insulation

After sealing the air leaks, it is time to install the insulation. Be sure to measure from joist to joist of the wall precisely, then use this as a basis when cutting insulation. Cut an inch less than the centre measurement.

After cutting the appropriate insulation length, stuff them tightly between the joists. Don’t forget to add multiple layers and fill until all joists are covered.


Insulating Your Attic Step 4: Completing the Installation

The walls of your attic are not the only places to insulate. To retain the right temperature efficiently, also insulate the attic floor, door, and stairs.


Unfinished vs. Finished Attics

Insulation installation methods will also differ based on whether your attic is finished or not. This is because you might need to deal with the cold zone of unfinished attics.

Unfinished attics are generally more complicated to navigate than finished ones. Since they are cold spaces, you need to provide proper ventilation from the outdoors while preventing air leaking from heated functional spaces.

When insulating an unfinished attic, it is best to hire the assistance of professionals for optimum installation and prevent accidents.

Meanwhile, finished attics typically have a degree of insulation in them so that you won’t need as much work. However, it won’t be a bad idea to increase the R-value (the insulation’s ability to reduce the rate of heat flow) if you think the room can’t retain sufficient temperatures.

Still, the roof of your finished attic should allow air to flow through the eaves and vents. Ventilation ensures the room can “breathe” and is comfortable to stay in.


DIY vs. Professional Installation

In some cases, attic insulation installation is a no-brainer and can be performed DIY. However, the feasibility of this is based on the type of attic you have and the kind of insulation applicable to your space.

Finished attics can be insulated DIY since they already have some insulation put in place. On the other hand, unfinished attics might need the help of attic conversion experts due to the risks of breaking the drywall and difficult-to-reach spaces.

Regardless, we recommend working with professionals when insulating attics. Insulating loft spaces is arduous, dangerous, and complicated, and any error would result in inefficient performance.

Expert Attic Conversion Services

Insulation is an integral part of every home, especially living spaces. If you are turning your attic into a new bedroom, office, playroom, or library, it is essential to install the right kind of insulation to keep them safe and comfortable.

If you need professional and reliable attic conversion services, don’t hesitate to contact Attic Plus. Attic Plus is one of the fastest-growing companies in Australia, committed to providing high-quality workmanship for all your attic needs.