General construction: how buildings go together
Insulation types and where they go
Insulation slows heat moving through the building envelope. Different materials suit walls, roofs, floors and below-grade areas. Here is a practical map of what goes where and why placement matters.
Insulation slows heat moving through the building envelope. Different materials suit walls, roofs, floors and below-grade areas. Here is a practical map of what goes where and why placement matters.
Common types
- Fibreglass and mineral wool batts: fit between studs and joists. See mineral wool vs fiberglass.
- Rigid foam boards: high resistance per thickness, used on exteriors, under slabs and on roofs. See rigid foam vs mineral wool.
- Spray foam: fills irregular cavities and seals air leaks, with product-specific rules.
- Blown-in loose fill: used in attics and cavities.
Where it goes
Insulation belongs on the boundary between conditioned and unconditioned space: roof or attic floor, exterior walls, floors over unheated space, and slab edges where required. Interior partitions need it only for sound or fire reasons.
Continuity matters
Gaps, compression and thermal bridges, such as steel studs conducting heat, reduce performance more than people expect. A continuous layer outside the frame reduces bridging, and the engineer or energy designer should specify it for steel framing.
Insulation and moisture
The wrong layer in the wrong place can trap moisture. Where the vapour control layer sits depends on climate, see moisture and condensation in walls and the vapour layer buying guide.
Reading the label
R-value (or U-value) is the tested resistance to heat flow, stated for a defined thickness and test method. Compare like with like, and require the data sheet rather than a marketing claim.
Quick answers
- How much insulation do I need? The code or energy standard for your climate zone sets the minimum. Your designer or authority will have the figure.
- Is thicker always better? There are diminishing returns, and installation quality matters as much as thickness.
- Can I add insulation later? Often yes, in attics and sometimes walls, but moisture behaviour must be checked first.
Keep reading
- Mineral wool vs fiberglass insulation
- Rigid foam vs mineral wool insulation
- Air sealing the building envelope
- Moisture and condensation in walls
Always check the project drawings and specification, and confirm requirements with the engineer of record and the local authority.
Questions people ask
How much insulation do I need?
The code or energy standard for your climate zone sets the minimum. Your designer or authority will have the figure.
Is thicker always better?
There are diminishing returns, and installation quality matters as much as thickness.
Can I add insulation later?
Often yes, in attics and sometimes walls, but moisture behaviour must be checked first.
Sources and further reading
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