PIR or Rockwool..

Hans_25 said:

PIR is known for its high thermal efficiency and ease of installation, making it a popular choice for construction projects. Many users find that while Rockwool might offer lower initial costs, it requires extra steps that can increase overall project expenses and time commitments. It's important to weigh these factors against the specific needs of your project and budget considerations. I'd lean towards using PIR unless budget constraints are critical.

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When comparing PIR and Rockwool, the cost and complexity can differ significantly, and much depends on whether you're applying insulation from below or above the boards. Here’s my reasoning:
1) The thickness of Rockwool needs to be doubled to match the insulation capabilities of PIR.
2) Using Rockwool necessitates a draught/moisture barrier beneath the boards to prevent air leakage.
3) Rockwool requires proper compression to maintain contact with the floor.
4) Rockwool must be adequately supported to avoid sagging and ensure it remains effective over time, as well as having a top layer to guard against wind.
On the other hand, PIR addresses all these requirements seamlessly and includes a reflective silver surface, enhancing its insulation properties.

With PIR, you can easily install it by placing long clout nails into the sides of the joists, allowing the PIR to sit just above the joists. After foaming any gaps, you can secure the boards down, with the PIR adapting to the support provided by the nails. For added stability, I’ve utilized old curved bed laths affixed to the undersides of joists, ensuring that the PIR consistently maintains contact with the floorboards.

Using 100mm PIR is straightforward, while using 200mm of Rockwool within 100mm joists can present complications.

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Insulation is an essential aspect of improving energy efficiency in any building. It plays a key role in maintaining comfortable indoor temperatures, generating savings on heating and cooling costs, and even reducing noise levels.

Polyisocyanurate (PIR) insulation boards are made of a rigid closed-cell foam core that is laminated on both sides. Among the various insulation options available, PIR boasts one of the highest thermal performances per millimeter. This characteristic allows for thinner and lighter PIR boards to deliver the same insulation value as thicker, heavier counterparts.

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