FAQ: Attic Insulation Retrofit

Blown fibre fills cavities and irregular spaces evenly, which traditional batts can't always reach. You get better coverage around pipes, wires, and awkward corners without leaving air gaps. It also typically settles less over time compared to some older fibreglass products.

Yes, and it's worth getting right from the start. Without proper airflow, moisture builds up in your attic, which damages timber and reduces how well the insulation works. Irish weather means you'll get damp if ventilation isn't planned before you add insulation. Check existing soffit and ridge vents, and assess whether you need additional ventilation paths.

A typical attic retrofit takes 1–3 days depending on size and how prepared you are. The actual blowing might be 4–6 hours of work, but equipment setup, safety checks, and cleanup add time. Having your ventilation sorted and attic cleared beforehand cuts hours off the project.

For Irish climate conditions, you're looking at 150–300mm depending on your current setup and target energy performance. Most retrofit projects aim for around 200–250mm to balance cost with comfort and energy savings. Your existing insulation, joists, and building regs will influence the final depth.

You'll need a blown fibre machine (usually rented from suppliers), a hopper, hose kit, and basic safety gear: respirator, goggles, and gloves. Most rental packages cost £100–250 per day and include delivery to your site. Some suppliers in Meath and surrounding areas offer weekend rates if that suits your schedule better.

A helper makes it much easier—one person operates the machine while the other manages the hose and spreads material in the attic. You can work solo, but it's slower and more tiring. If you're working alone, plan for longer days and regular breaks.