I am trying to figure out the number of Acrow props / Strongboy heads needed to support the floors / walls while I install an RSJ, but the numbers aren't making much sense.
Plan is to prop / scaffold board under the floor joists to take most of the load off the wall, and use strongboys to take the remaining load of the wall itself.
So, using the SE's load table, the floor dead, & floor live loads come out to 24.38kN (unfactored total, both sides)
Using a kN to kgf calculator, this results in 2486kgf. The size of Acrow prop I need has a working load of 1500kg, so that's only 2 props!
Then I take the wall & loft dead load which is 25.48kN = 2598kgf (unfactored) = 8 strongboys (max load 340kg)!!!
This doesn't seem realistic to me because the RSJ is only a 2.1m span, so it would mean a strongboy every 250mm! And this is with the floor load already taken out!
Is there a fault in my calculations or are strongboys really that weak?
Plan is to prop / scaffold board under the floor joists to take most of the load off the wall, and use strongboys to take the remaining load of the wall itself.
So, using the SE's load table, the floor dead, & floor live loads come out to 24.38kN (unfactored total, both sides)
Using a kN to kgf calculator, this results in 2486kgf. The size of Acrow prop I need has a working load of 1500kg, so that's only 2 props!
Then I take the wall & loft dead load which is 25.48kN = 2598kgf (unfactored) = 8 strongboys (max load 340kg)!!!
This doesn't seem realistic to me because the RSJ is only a 2.1m span, so it would mean a strongboy every 250mm! And this is with the floor load already taken out!
Is there a fault in my calculations or are strongboys really that weak?
