That last photo shows those ceiling joists being mounted for roof stiffness (which is what they're intended for). Without significant additional strengthening however they would not be able to hold any significant loads. As these cross beams are effectively just hanging down from the rafters with those rafter ties, anything on there would solely rest on those metal pins.

Although you may plan to only store light materials there, I would be very careful mounting anything that even remotely suggests it could support both a person and additional loads. Keep in mind that you may not end up being the only person rummaging around up there, either family members (for example future adult offspring helping out to get something) or if you sell the house, future owners.

As they can still hold light items (for example packs of insulation materials, boxes with clothes and whatnot), I would alternatively opt for denser spaced ceiling joists perpendicular to the roof, with regular openings (say two joists closed, one joist open, and the perpendicular joists spaced 30cm apart) that you can reach with a ladder. Example (top down):

These will be able to hold objects, boxes and packs while in no way suggesting that a person should crawl up there. This will also keep the structure completely visible so you can see any future wear and tear on connections and beams. I might additionally consider stiffening those connections a bit more, they will after all be carrying a higher load than they were designed for.

That last photo shows those ceiling joists being mounted for roof stiffness (which is what they're intended for). Without significant additional strengthening however they would not be able to hold any significant loads. As these cross beams are effectively just hanging down from the rafters with those rafter ties, anything on there would solely rest on those metal pins.

Although you may plan to only store light materials there, I would be very careful mounting anything that even remotely suggests it could support both a person and additional loads. Keep in mind that you may not end up being the only person rummaging around up there, either family members (for example future adult offspring helping out to get something) or if you sell the house, future owners.

As they can still hold light items (for example packs of insulation materials, boxes with clothes and whatnot), I would alternatively opt for denser spaced, thin ceiling joists perpendicular to the roof, with regular openings (say two joists closed, one joist open, and the perpendicular joists spaced 30cm apart) that you can reach with a ladder. Example (top down):

These will be able to hold objects, boxes and packs while in no way suggesting that a person should crawl up there. This will also keep the structure completely visible so you can see any future wear and tear on connections and beams. I might additionally consider stiffening those connections a bit more, they will after all be carrying a higher load than they were designed for.

That last photo shows those ceiling joists being mounted for roof stiffness (which is what they're intended for). Without significant additional strengthening however they would not be able to hold any significant loads. As these cross beams are effectively just hanging down from the rafters with those rafter ties, anything on there would solely rest on those metal pins.

Although you may plan to only store light materials there, I would be very careful mounting anything that even remotely suggests it could support both a person and additional loads. Keep in mind that you may not end up being the only person rummaging around up there, either family members (for example future adult offspring helping out to get something) or if you sell the house, future owners.

As they can still hold light items (for example packs of insulation materials, boxes with clothes and whatnot), I would alternatively opt for denser spaced ceiling joists perpendicular to the roof, with regular openings (say two joists closed, one joist open, and the perpendicular joists spaced 30cm apart) that you can reach with a ladder. These will be able to hold objects, boxes and packs while in no way suggesting that a person should crawl up there. This will also keep the structure completely visible so you can see any future wear and tear on connections and beams.

That last photo shows those ceiling joists being mounted for roof stiffness (which is what they're intended for). Without significant additional strengthening however they would not be able to hold any significant loads. As these cross beams are effectively just hanging down from the rafters with those rafter ties, anything on there would solely rest on those metal pins.

Although you may plan to only store light materials there, I would be very careful mounting anything that even remotely suggests it could support both a person and additional loads. Keep in mind that you may not end up being the only person rummaging around up there, either family members (for example future adult offspring helping out to get something) or if you sell the house, future owners.

As they can still hold light items (for example packs of insulation materials, boxes with clothes and whatnot), I would alternatively opt for denser spaced ceiling joists perpendicular to the roof, with regular openings (say two joists closed, one joist open, and the perpendicular joists spaced 30cm apart) that you can reach with a ladder. Example (top down):

These will be able to hold objects, boxes and packs while in no way suggesting that a person should crawl up there. This will also keep the structure completely visible so you can see any future wear and tear on connections and beams. I might additionally consider stiffening those connections a bit more, they will after all be carrying a higher load than they were designed for.