Hello
I want to install flooring in my attic. The roof trusses are spaced at 1200 mm.
There is already a walkway in place, which is positioned on top of 70*45 battens that lie across the roof trusses. However, as the space is limited, I want to maximize both the floor area and ceiling height by eliminating these 70 mm substructures.
The attic is "warm," meaning the insulation is located in the outer roof. Access to the attic is through a roof hatch with internal dimensions of approximately 0.5*1.1 m. A little flex in the attic floor is not a problem, but it must not fail.
What's the best approach?
1. Can I use regular chipboard flooring and screw battens underneath them so that they fit between the roof trusses?
2. Or do I need to create a more substantial crosswise joist system with joist hangers attached to the roof trusses?
/ Per
I want to install flooring in my attic. The roof trusses are spaced at 1200 mm.
There is already a walkway in place, which is positioned on top of 70*45 battens that lie across the roof trusses. However, as the space is limited, I want to maximize both the floor area and ceiling height by eliminating these 70 mm substructures.
The attic is "warm," meaning the insulation is located in the outer roof. Access to the attic is through a roof hatch with internal dimensions of approximately 0.5*1.1 m. A little flex in the attic floor is not a problem, but it must not fail.
What's the best approach?
1. Can I use regular chipboard flooring and screw battens underneath them so that they fit between the roof trusses?
2. Or do I need to create a more substantial crosswise joist system with joist hangers attached to the roof trusses?
/ Per
Thanks for the inspiration!
It will surely hold, but I can't get full-size boards through the attic hatch. I might have to cut them into 800*1200 pieces if that's the case, which means a joint over each roof truss beam.
How do I attach the boards to the beams in a good way? There aren't many millimeters to work with.
/ Per
It will surely hold, but I can't get full-size boards through the attic hatch. I might have to cut them into 800*1200 pieces if that's the case, which means a joint over each roof truss beam.
How do I attach the boards to the beams in a good way? There aren't many millimeters to work with.
/ Per
I built my attic floor out of 20-21 mm raw plank. However, I only have a cc of about 90, so unfortunately, it will probably be too wobbly with 120 (it's over 100 in one spot near the chimney, and even that feels different). If you can get thicker raw plank, like 28 mm, that would work and, in my opinion, looks much nicer than with boards. Easier to get up through the hatch as well.
This would probably fit well: 26*190 mm floor wood, nice and cheap: http://www.gsbyggvaror.se/?page=product&category=25&product=395#product
That sounds interesting! 5 packages of the longest variant cover exactly what I want without needing to saw. Up to the attic hatch, they have to be brought in through the upstairs window, but then I have to figure out if they'll come up through the hatch without hitting the inside of the outer roof.
Unfortunately, I don't live in southern Halland
.
Unfortunately, I don't live in southern Halland
.Pine floor 30 mm, 3rd grade, with your old 45*70 between each truss, you will remove most of the flex. A tongue and groove glued and screwed floor should meet your needs. Strength-wise, it's more than sufficient. At each support leg, screw on a shorter nogging for support so you can reach far towards the eaves.
https://www.byggahus.se/forum/threads/belastning-fackverkstakstol-har-lagt-golv-pa-vinden.301030/
https://www.byggahus.se/forum/threads/belastning-fackverkstakstol-har-lagt-golv-pa-vinden.301030/
Many older roofs are constructed with roof boarding directly on rafters CC 1200mm. I have also supplemented with roof boarding 21x120 to cover the entire attic and there are no problems. Buy roof boarding that is also end-spliced and go ahead, mine has held up since '62.