150mm Insulation
(9 Products)150mm insulation represents a heavy-duty specification used to achieve high-performance thermal barriers in a single application. Selecting this depth is a strategic decision to reduce multi-layering on-site, providing a robust profile for floors,
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Engineering & Specification Requirements
Specifying 150mm insulation is a technical choice driven by the need for maximum thermal resistance within a fixed structural depth. In ground-floor applications, 150mm boards provide the necessary compressive strength to support heavy screeds and concrete slabs while maintaining a consistent thermal break across the entire footprint. The substantial mass of a 150mm profile also offers enhanced acoustic dampening in mineral wool formats compared to thinner alternatives.
The utility of a 150mm thickness lies in its efficiency during installation. By using a single 150mm lift of PIR or EPS, contractors can eliminate the air gaps and potential "thermal bypassing" that often occurs when stacking multiple thinner boards. For timber frame and rafter applications, 150mm slabs provide a friction-fit depth that fills a significant portion of the structural void, ensuring a tight fit that minimises heat loss through convection.
Application & Format Selection
- Ground-Bearing Floors: 150mm PIR or EPS150 boards installed beneath concrete slabs to manage heat retention in high-mass structures.
- Warm Flat Roofs: 150mm rigid PIR or Phenolic boards laid over a vapour control layer to create a continuous, rigid thermal cap.
- Suspended Timber Floors: 150mm Mineral Wool or Flexi-slabs supported between joists to provide both thermal insulation and sound reduction.
- Inverted Roof Systems: 150mm XPS (Extruded Polystyrene) for moisture-resistant, high-load-bearing insulation placed above the waterproof membrane.
Frequently Asked 150mm Insulation Questions
Can I fit 150mm insulation into 100mm joists?
You should never compress 150mm insulation to fit a 100mm space. Compressing the material removes the air pockets that provide the insulation. Instead, you should either use loft legs to raise the floor level or use a thickness that matches the joist depth.
What is the best way to cut 150mm insulation?
For 150mm rigid boards, a fine-toothed insulation saw or a long-bladed knife is recommended to ensure a square, flush cut. For 150mm rolls, a sharp insulation knife or large shears will provide the cleanest edge for tight butt-jointing.
How do I secure 150mm boards to a wall?
Due to the thickness and weight, you will need specialist extra-long insulation fixings (thermally broken) that can penetrate the board and anchor at least 40mm - 50mm into the masonry or timber behind it.
