Renovating barn, some extra studs and flooring etc

[Uttis]

Hi and ho, I have seen others do similar things, but nothing is quite like mine.

I would like to lay a new floor in my hayloft (I have some 20x95 raw wood lying around) and would like to add extra joists between the existing ones so the floor doesn't sag (cc 900mm today).

As you can see in the picture, the existing ones are tucked into the wall and I have no desire to do that with the extras; I also don't want to lower the ceiling height on the first floor, so my question is how to attach the new joists and what dimension should they be?

The width is about 10 meters and in the middle, there are two crossbeams where the existing beams are supported.

 

[huggan]

What is the wall made of? Balksko might be a solution.

 

[Uttis]

Dry crumbly concrete, I think there are some larger stones inside as well. Did you mean that the beam hanger would be attached to the wall?

 

[öringen]

attach a ledger/beam to the wall under the existing joists, secured with expansion bolts or similar, and you will have a support for the extra joists.
The joists should be fine with the same dimension as your old joists, whatever they are, 6 inches?

 

[Lutte]

Screw a 45x95 onto the existing beams 45mm from the wall, protruding 200mm, then insert a 45x195 behind against the wall and secure with long sturdy screws. Then you have a support to be able to add more beams, that's how I, as a happy amateur, would do it.

 

[Uttis]

I would prefer not to attach anything to the wall; I don't think it can hold much if I use expansion bolts. Can I attach a joist hanger to each existing beam, place a short stud between them with an additional joist hanger in the middle where the new stud is placed?




Yep, the existing beams are around 145mm, I thought I might get away with using smaller ones, but it's probably not a good idea to skimp since they are fairly manageable.

 

[Lutte]

If it is porous, you can chem-anchor threaded rods.

Otherwise, the first option you've drawn is sensible.

 

[Uttis]

Around the door, it is rock hard, seems to be some rectangular blocks embedded there, the rest is crumbly, wouldn’t call it concrete exactly, maybe some type of quick-drying concrete they had a long time ago with large stones mixed in. You could probably take a brush and just brush right through where it’s crumbly, as the small grains of sand just fall away. Does anyone know what material the wall is made from and if it can be repaired in some way where it’s damaged?

Great, then I'll go with my first idea or alternatively pull a steel pipe under all the joists and some columns here and there and use it as a setup.