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My query is what is can the cavity wall below DPC be left empty i.e. Air only or does the cavity need to be partially filled with concrete? I have found an LABC document from 2023 that suggest that the void should be left free a minimum of 225mm below DPC. My cavity is currently 350mm below DPC...

I am building a garden room, two of the external walls are constructed of blue engineering brick externally, 110mm cavity, dense concrete block internally. The cavity from DPC to concrete foundations is 350mm. I am finding conflicting information regarding filling the cavity, filling some of...

Correct. 150mm from floor to DPC, 2100mm to top of Bifold, 200mm wooden Joists spanning 4.5mts plus 50mm fiirrings and 25mm OSB and I’m just over the 2.5mts. I will have a 150 / 180 UB on top of the Bifolds which means that I can’t continue the joists. Hope this makes sense. I think the only...

I was thinking the same thing ref stubs off the UB.

Yes exactly. I can’t cantilever in the traditional way due to 2.5mtr height restriction

Im building a garden room. I will have a UB above the bi fold door but would like to extend the roof to form a canopy similar to the below image. Due to the max building height of 2.5mts under permitted development i will need to fix the joists using joist hangers to the steel UB. Is there any...

All, Is it possible for a structural engineer to calculate the lateral load of the blockwork wall to fix bifold doors to? Im assuming that this is possible but maybe more difficult / time consuming to calculate than steel? Is there any rule of thumb data anyone is aware of?

Thanks freddie mercurys twin, just having another think on this as the vertical steel is 100mm and the bifolds fixing to the inner face there wont actually be any steelwork on the inside of the warm building? The two Bi folds will butt up against each other at the corner, if that makes sense so...

No masonary over the top as the building is within permitted development so need to keep the height to 2.5mts from external floor level. Was going to use joist hangers from the top of the steel to support the wooden joists. Ive just spoken to a builder and he is suggesting the RSJ should sit...

Thanks you. Just wondering the RSJ will not sit directly over the Bifold. Will i need a plate welded to the bottom of the rsj to fix the bifold to and the same with the vertical shs to meet the bi fold doors?

Thanks freddiemercurys twin. Just to clarify you would install the steel as shown on the layout below? If so how would you finish round the post?

Im in the process of building a garden room, two walls will be block and the other two will be Bi-fold doors. I was originally going to build a brick pillar where the two doors meet but my friendly builder suggested installing a steel 4 inch post between the doors. This will support the two...