Hello everyone!
I am wondering what to do when the flooring for the upper floor is too weak.
I live in an old mission house that I have been renovating over the past year. The house has previously been used as, among other things, a craft shop, and the previous owners built an upper floor to use as storage.
However, the flooring is only 120*45mm rough-sawn wood and too weak to build proper rooms on.
The question now is whether I have to remove the wood shavings and replace the joists or if I can lay 95*45 cross-laid on top, or will this not be sufficient?
Does anyone know?
Take care
Mattias
I am wondering what to do when the flooring for the upper floor is too weak.
I live in an old mission house that I have been renovating over the past year. The house has previously been used as, among other things, a craft shop, and the previous owners built an upper floor to use as storage.
However, the flooring is only 120*45mm rough-sawn wood and too weak to build proper rooms on.
The question now is whether I have to remove the wood shavings and replace the joists or if I can lay 95*45 cross-laid on top, or will this not be sufficient?
Does anyone know?
Take care
Mattias
If you have good ceiling height downstairs, you might consider adding for example 95x120 mm beams crossed against 45x120 in the ceiling. It can look fantastic in the ceiling if they are roughly sawn or planed. A few in each room might be enough.
But what is the span then?
If it is a reasonably normal span, it is probably more normal with 45x170 to 45X220, depending on the span you have.
If it is a reasonably normal span, it is probably more normal with 45x170 to 45X220, depending on the span you have.
I have plenty of space in terms of height. About 5.5 m to the ridge, roof ridge-roof, so height is not an issue. I have already nailed the ceiling on the lower floor.
I undoubtedly have space to build 95mm in height, but I'm wondering if the load-bearing capacity is sufficient. The span that the timber is on now is a total of 11 m; I have a glulam beam after about 3.5 m that replaced a previous "load-bearing" wall, and an I-beam in steel after another 4 meters, leaving the last section about 3.5 meters to the opposite wall. I hope you understand what I mean.
The width of the room is about 8m, so does the load-bearing capacity suffice with 9555 timber?
The alternative as I see it is to cut up the floor (platform floor) and place 220*45 alongside the old joists, I have no desire to replace them, they can stay, which of course becomes a larger project.
//
Mattias
I undoubtedly have space to build 95mm in height, but I'm wondering if the load-bearing capacity is sufficient. The span that the timber is on now is a total of 11 m; I have a glulam beam after about 3.5 m that replaced a previous "load-bearing" wall, and an I-beam in steel after another 4 meters, leaving the last section about 3.5 meters to the opposite wall. I hope you understand what I mean.
The width of the room is about 8m, so does the load-bearing capacity suffice with 9555 timber?
The alternative as I see it is to cut up the floor (platform floor) and place 220*45 alongside the old joists, I have no desire to replace them, they can stay, which of course becomes a larger project.
//
Mattias
Actually, you should have a structural engineer take a look at that. If the floor is built with such weak joists, there's a risk that neither the glulam beam nor the steel beam have been properly dimensioned. The fastening of the beams can also be critical. With some (rough) quick calculations, it becomes 3 - 4 tons that need to be supported by each support point for the beams.
But I can give an example from our house. We have added a floor to part of the house. We have a steel beam (HEA 160) 5m long running in one direction. Then the floor joists 45x220 are inserted into the beam, so the total thickness of the intermediate floor with the beam and all is 220mm. The longest span for the joists is 4m.
But I can give an example from our house. We have added a floor to part of the house. We have a steel beam (HEA 160) 5m long running in one direction. Then the floor joists 45x220 are inserted into the beam, so the total thickness of the intermediate floor with the beam and all is 220mm. The longest span for the joists is 4m.