Boarding Your Loft: Best Practices
Adding flooring to your loft is a great way to create extra storage space, but it must be done correctly to avoid damaging your home's structure or reducing your energy efficiency.
1. Do Not Compress Insulation
One of the most common DIY mistakes is laying flooring directly onto ceiling joists when there is thick insulation between them. Compressing 270mm of mineral wool down to 100mm reduces its thermal effectiveness by over 50%. This is why Loft Legs are essential—they raise the floor level to leave a gap for the full depth of insulation.
2. Choosing the Right Panels
Most loft flooring panels are 18mm or 22mm thick moisture-resistant (P5) chipboard. While large 2400x600mm panels are cheaper, they are often impossible to get through a standard loft hatch. "Handy" panels (1220x320mm) are specifically designed to be easily maneuvered in tight spaces.
3. Weight Limits
Ceiling joists in older homes were designed to hold the weight of the ceiling plaster and a small amount of "dead load." They are not intended to support heavy furniture or serve as a habitable room. Always consult a structural engineer if you plan on storing heavy items.
Expert Tip: Vapor Control
Ensure that you do not block the ventilation in your loft. Air needs to flow from the eaves into the loft space to prevent condensation and rot. Keep your flooring well away from the very edges of the roof.