General Questions

LoftZone StoreFloor is suitable for almost all attics, including cut, purlin and truss-roofed types, if you are looking to insulate the floor of the attic. It's frequently fitted in both houses and commercial buildings. Your joists or chords will be need to be timber and be at least 1.25" (32mm) wide and 3" (75mm) tall.

Most people would like to board their whole attic, but you don't have to. StoreFloor is modular so you can start small and build more later when your storage requirements go up. Most people choose a square or rectangular deck, or an L or T shape near the hatch. Some people have more than one deck, on either side of the hatch. Don't board right up to the eaves though, as you'll want to keep a gap for ventilation.



StoreFloor is extremely strong and LoftZone is the only raised attic floor manufacturer to have put its products through robust accelerated lifetime tests in extremes of temperature. Even in these conditions, a StoreFloor deck survived loads of over 100 lbs. / sq. ft. (500kg/m2), without failure.

In addition to being strong itself, StoreFloor's lattice-beam structure also strengthens the joists it is screwed into. Nonetheless, StoreFloor is only intended for storage and occasional access, and we recommend that you don't overload your joists, as these will be weaker than the StoreFloor deck. If in doubt, consult a structural engineer.

The deck will be raised 11” (279mm) above the top of your joists. This is to allow for a full depth of attic insulation up to 13.5” (350mm), measured from the floor of the attic plus an air gap above the insulation and below the boards. This essential air gap is there to allow air to flow over the insulation, thereby taking away any humidity which might otherwise condense on the underside of the boards and cause damp.

Note that this height, including the air gap, will allow you to achieve an R-49 depth of insulation, using standard insulation products, suitable for most states in the USA. Consult this guide to see which insulation depth is recommended for your area. If you wish to raise the deck even higher, then we recommend using one row of timber joists beneath the StoreFloor components

The vast majority of joists are either 16" (400mm) or 24" (600mm) apart when measured from the centre of one joist to the centre of the next one. That is why our Cross-Beams are designed to span 4 ft (1200mm), so they fit perfectly. Importantly, there is also up to 3" (75mm) tolerance in case your joists weren't built exactly to these dimensions (many aren't!). And because the Cross-Beams bridge over intermediate joists, if you find there are any that are uneven or warped, you can just miss these out. So for most properties, everything will work fine.

Some houses however have other, or variable, joist spacing. In that case, you'll need to cut the Cross-Beams to the right size, so that they span between joists without overhanging or falling short. Cutting the Cross-Beams is easy; just use a saw or tin-snips. The beams are strong thanks to their design but only 0.7mm thick.

If you need help working out exactly how many parts you need, get in touch with us.

StoreFloor has been installed in thousands of properties, from new build right through to heritage period houses. It works well in all of these but some older properties do cause certain issues when the joists are of uneven height or not flat. This doesn’t stop StoreFloor being fitted, but it’s worth considering the following points:

  • The first point to note is that StoreFloor bridges over, and completely misses out, most joists, since the Cross-Beams span 4 ft. (1200mm). Therefore, with a bit of planning, you can often choose to place the supports in such a way as to completely miss out the joists that cause the problem.
  • Occasionally however you will find that, even with the best planning, some of the joists you fix the supports to could be higher than others, or too uneven to screw into. The way our installers get around this is either by fitting a wooden shim underneath some supports, to make everything level, or to screw a small new piece of wood to the side of the original joist, and to fit the support on to that.