Measure your loft insulation in five minutes
Grab a ruler and a torch. Here’s how to measure what you’ve got and what the number means.
| You need | A torch, a ruler, gloves and a dust mask |
|---|---|
| Takes | About five minutes |
| Never | Step between the joists |
How to measure
Stand on a joist or board, never between. Push a ruler straight down through the insulation until it touches the ceiling. Check a few places.
What it means
- Under 100 mm: very thin; a top-up or full insulation.
- Level with the joists: too thin; top up across them.
- Around 270 mm, even and clean: likely fine.
Common questions
Can you measure my loft and quote?
Yes. The quote is free and in writing, with every part priced.
Full depth below. Room to store above. Get a price.
Tell us about your loft and we’ll quote the insulation, boarding and ladder in writing. Free, no obligation.