How to approach support of 2 floor beams

We are considering making our lounge/kitchen open plan and to do this need to remove some wall sections.
The wall sections to be removed are supporting the beams for the first floor and I can see how we would support most of them using a lintel, but there are 2 beams which are more awkward.

Here is a floor plan


The wall sections that need removing are labelled A, B and C
The four beams resting on wall A could be supported by a lintel being installed between Wall 1 and Wall 2
The beam resting on wall 2 where section C is to be removed could equally be accommodated
by moving it back to sit on Wall 2.
It is the 2 beams sitting on the section of wall to be removed labelled B which I need to consider and would be interested in hearing any thoughts.

Here is a 3D showing the part of the current layout where the walls need to be removed.


Hopefully the supplied images give a sufficient idea of what needs doing so you guys might be able to comment on how you would approach the issue of the two 'floating beams' before getting in someone to give me a quote.

Theres not enough info to be specific, but in general, where you have wall B shaded in blue, fit a trimmer there. You might need to double the joists that support the trimmer.

To avoid confusion, what you have termed beams, they are joists

Please note, joists also often act as part of the roof structure -so best not to assume anything.

Pass the nurofen

As per Notch, you would just use a trimmer formed of two joists screwed together, one end off a joist hanger off the last of the 4 beams on A (nearest to the letter "C") and the other end off what's left of the remaining wall just beyond the letter "B".

Notch7 said:

To avoid confusion, what you have termed beams, they are joists

Click to expand...

tony1851 said:

As per Notch, you would just use a trimmer

Click to expand...

Are you chaps aware that the floor joists appear to be engineered fellas, i.e. Posi-Joists or similar? Perhaps refer back to the designers/suppliers for a remedy and their designated metalwork and sundries.

I suppose the principals will be similar albeit less straight forward than suggested. Bear in mind that none of the joist material can be removed.

noseall said:

Are you chaps aware that the floor joists appear to be engineered fellas, i.e. Posi-Joists or similar? Perhaps refer back to the designers/suppliers for a remedy and their designated metalwork and sundries.

I suppose the principals will be similar albeit less straight forward than suggested. Bear in mind that none of the joist material can be removed.

Click to expand...

Good point -I hadnt studied the drawing, I just vaguely wondered why so much detail, with set out dims.

I can see the drawing has eash joist part numbered, ie A06 A09 etc......which indicates its a supplier drawing, so as you say back to them for advice.

Ive not dealt with engineered joists, but the drawing looks very similar to block beam drawings

Thanks for the input guys.
I now have the full drawing which confirms these are definitely posi-joists. The drawing also has the contact details for the specifier/manufacturer so I will call them on Monday.