Products we use
Knauf Insulation Loft Roll
The glass mineral wool we fit in cold lofts
Loft Roll 44 is the insulation we use for most loft work, including putting a loft back together after spray foam has been removed. This page explains what it is and where it goes.
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Knauf Insulation Loft Roll 44 is a glass mineral wool roll made for cold lofts, where the pitched roof is insulated at ceiling level rather than at the rafters. It is non-combustible with the best Euroclass A1 reaction to fire classification, and is made using Knauf Insulation’s ECOSE Technology bio-based binder.
It is odourless, rot proof and non-hygroscopic, does not sustain vermin, and will not encourage the growth of fungi, mould or bacteria. In a loft that is dry and properly ventilated, mineral wool of this kind will keep working for decades without attention.
Where we use it
On the jobs it suits
Most of our loft insulation work is one of three things. A loft that has never been insulated properly, a loft with 100mm or so from years ago that needs topping up to the recommended depth, or a loft that has just had spray foam taken out and needs insulating again from scratch. Loft Roll goes into all three.
The Energy Saving Trust recommends at least 270mm of mineral wool in a loft where that is suitable. Depth is most of the job, so getting to that figure matters more than the brand on the packaging. What the product choice buys you is consistency, a fire classification you can point to, and a binder that does not smell.
If you want to use the loft for storage as well, the boards have to sit clear of the insulation on a raised deck, otherwise the wool is compressed and stops performing. We quote the insulation and the boarding together where both are needed.
Worth knowing
A note on depth
Depth is what does the work, so when you compare quotations check the depth being fitted and whether the existing insulation is being topped up or taken out and replaced. A thin layer of a good product is still a thin layer.
More on depth, materials and condensation in our loft insulation and boarding guides, and the service itself is on the loft insulation page.
Free no-obligation survey
Loft needs
doing properly?
We measure what is up there, tell you the depth you have, and quote the work in writing. Call, email, or fill out the contact form.
