gs412m

so change of plan, the party wall is not an issue so it seems now. As the work would come under the Party Wall Act, so I would only have to give 2 months notice to neighbour before carrying out the work. This means I'll be spanning the joists across the shortest distance across the width of the room, meaning I can reduce the size of the timber to 38mm x 120mm according to NHBC Standards, but will still run them at 300mm centres just or extra strength as suggested. 3000mm C24 38mmx120mm wall plate attached to the brick face with M12 threaded bolts 100mm deep, then the above joist hangers installed to give a 84mm bearing on the joist end.

Sorry for the delay, yes the 140mm internal wall is plaster face to plaster face measurement

Yup.....stays the same

No....the internal wall that the lintel is in currently is 140mm deep. Have had a quick google search and it looks like lintel installation is covered under the Party Wall Act, so all I require is to inform the neighbour with two months notice. Just popped out the door and measured it, if the party wall is this deep through the building it is approx 330mm thick, so 150mm will not even go halfway through

....this product would remove the need for props ? https://www.diversityproducts.co.uk/no-more-props/opening-sizes.html

.....right.... builder it is I'll pass on that DIY job thanks for the information

The opening is going to be greater than 1200mm, so I will have to have 150mm bearing minimum ? No other method / lintel type to reduce this depth into the party wall ?

Currently it's the doorway to the rear 'bedroom' which is lower by approx 400mm than the rest of the first floor

It's the rear wall of the house upstairs so possibly the roof to an extent, as there are two verge large timber beams in the loft ?

Hi, I'm looking to create a staircase landing to a new upper floor I am creating. As part of it I wish to use an existing doorway opening, and double the width of it to create a landing for the new staircase. From what I have read this would require increasing the bearing length of most lintels from 100mm to 150mm. As the new floor will be approx 400/500mm lower than the existing height, what recommendations are there for lintels to ideally keep bearing to a minimum as one side enters a party wall shown in light pink on image attached, and keeping the existing lintel in place to remove some of the load on the new lintel to be installed ? Edit ~ the wall is masonry 140mm Hopefully this makes sense, many thanks in advance Graham

Just had a reply from Simpson Strong Tie as for suitable joist hanger which would provide the minimum solid joist timber bearing length of 75mm. They pointed me in the direction of this product https://www.strongtie.co.uk/products/detail/face-fix-hangers/39 Looking at the installation images, I may not require the timber wall plate, as there are 4 x M12 bolt holes for fixing directly into masonry ??

Great, thank you both for the advice sounds a lot easier and quicker than chasing out the pockets for the new joists to fit into

Thanks for the replies, just like to understand this part please

Thanks for that, the joists will need to run along the 3000mm span, as across the 2200mm span at one side of it would be a party wall, so rather avoid that if I can. I was looking at using M12 threaded bar (rawlplugs R-STUDS-12220-A4) inserted 100mm into the masonary at 400mm spacing (1 midway of each joist space either end) using their R-Kex II resin to bond these into the masonary ? Hadn't thought of the flooring, was going to use carpet as current bathroom is, but 15 or 18mm plywood as the base ?

.......I assume as per nhbc standards, masonary joist hangers are not permitted to be retro fit into masonary walls ? or that would of been an alternative idea to drill out the mortar between the bricks where joists will locate, insert joist hanger then fill with mortar or epoxy resin ....