Wall vs Roof Insulation in Sheds: What Matters Most?

If you’re insulating a shed in Perth and only have the budget or time to do one section — should you focus on the walls or the roof first? The answer depends on how you use the space and what Perth’s climate throws at you. Let’s break it down.

Understanding Heat Transfer in Sheds

Sheds are typically lightweight structures with metal cladding, meaning they absorb heat fast and lose it just as quickly. In summer, the roof is exposed to direct sun for most of the day, making it the largest contributor to internal heat gain.

In winter, uninsulated walls allow heat to escape and cold air to enter. Both matter — but they impact comfort and function differently.

When Roof Insulation Should Come First

Insulating the shed roof is the #1 priority if:

• Your shed gets full sun exposure
• You use the shed during hot afternoons
• It’s a workspace or studio that needs cooling

Start with products that reflect radiant heat and provide thermal resistance:

• Ametalin SilverSark – Reflects radiant heat before it enters
• ThermalBreak 7 – Combines foil and thermal resistance in one board
• Earthwool R4.0 Batts – For enclosed roof cavities with ceiling lining

When Wall Insulation Is Just as Important

If your shed is used in the evening, at night, or is near noisy surroundings — wall insulation becomes a higher priority.

• Improves heat retention in winter
• Reduces outside noise (especially near fences or streets)
• Essential if you're adding lining or electrical work

We recommend high-density wall batts such as:

• Earthwool R2.7 HD – Great for framed shed walls
• Wall Insulation Collection →

What If You Can Only Choose One?

Still can’t do both right now? Here’s a general guide:

• For summer use or full-sun locations → start with roof insulation
• For comfort in winter or better noise control → insulate the walls first

Bonus: Use a Thermal Break

Even if you’re not fully insulating, a thermal break helps reduce radiant heat transfer from metal cladding into the shed frame. Options like ThermalBreak 7 or SilverSark are easy to install and ideal for new builds or renos.

Conclusion

If your shed is more than just a storage box, insulation is a smart investment. The roof and walls both matter — but where you start depends on how the space is used.

Need help choosing the right product for your shed? Call us on 0417 910 326 or browse our full shed insulation range today.