Standard joist spacing for the installation of attic flooring materials is 16 inches on center oc meaning the distance from the center of one joist to the center of the next joist is 16 inches.
Attic floor risers.
Existing 3 4 inches of insulation.
You can sister the joists by cutting 2 x8 boards the same length as the joists applying construction adhesive and affixing each to a joist with nails.
Attic decking kit for a storage floor above deep attic insulation 8ft x 8ft kit.
The loftleg is a unique design protected solution to avoid insulation compression when using your loft for storage.
Joist dimensions are only part of the equation.
Rip 1 2 thick plywood to 24 widths so it will fit up the attic stairs.
You might open up your attic and find bare joists with fiberglass or cellulose insulation between the joists.
Add insulation to attic.
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You also need to ensure that the joist spacing is adequate.
Build a frame on 16 centers perpendicular to the attic floor joists.
Full the spaces between the frame members with insulation.
Raise ceiling joists also if the attic insulation is thicker than your ceiling joists you can raise the height of the joists to above the insulation by attaching 2 3 s to their top edge before you attach the attic floor boards.
Loft legs are strong and can support weights of 500kg however they do not change the load bearing characteristics of a loft.
Attic joists that are made from 2x8s may be acceptable for building your attic floor but because every room is variable there are no absolutes.
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Fortunately this is a fairly easy fix.
Thermal studies show that compressing insulation can reduce it s thermal properties by more than 50.
Structural engineers recommend never storing more than 50kg per square metre of.
Attic dek flooring is an easy to install floor option that provides additional storage space supporting up to 250 lbs.
Screw the frame to the joists to secure it in place making sure not to screw into electrical wires.