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I have a single story extension with lean to roof and with a 3.6m opening for bifolding doors and plan on fitting 2 RSJ's across this span, 1 on each cavity wall. As I've never done this before can I check the installation procedure for this. - RSJ's will be about 4m in length, going to get...

I've got about 19 sq M to screed to a depth of approx 65mm and based on quotes of £250 (labour only) I am thinking of doing it myself, as I've already done everything else. My question is, is this a straightforward job, i.e get the levels/screeds right, mix the sharp sand, fibers, cement in a...

ah that would explain the weep vents I put in, but dont have the step. BC aren't asking for it so hopefully I can leave it. (I sometimes think they havent a clue anyway). As for the wall ties, I plan to put some ties on the 1st course of blocks, but as the DPM laps back into the blocks on the...

Also whilst I think if it, I do have wall ties low down, that would pierce the DPM lapped up, should I remove these?

ok great thanks. Does your diagram show some sort of DPC tray between the 2 cavities? Its just that I've already built the first few courses of the outside wall with a DPC and wasnt expecting the bridge the cavity?

Hi, I have an area of approx 6m by 3m on a ground floor extension which is block and beam construction, that I now need to insulate and screed to finished floor height. I was planning on putting 1200g DPM down, then 80mm celotex insulation (taped at joints), then 65mm screed (approx 1.2m3)...

As part of my house extension, I have a set of patio doors being fitted. I have laid the first few courses of brickwork up to DPC level, however as my house has a 'feature' wall that includes a plinth course above the 1st five courses, setting the brickwork back, all the existing patio doors in...

Hi Just about to lay my B&B flooring and have a query over the DPC courses. The B&B floor will sit on 100mm internal cavity blockwork and I will be installing a DPC course between the B&B beams and the blockwork. The beams will run end to end from supporting wall to supporting wall. The sides...

Spoke to catnic and they spec'd up a CX70/100 to handle the job. Just need to be wary of drilling into the lintel and use bitumin paint to protect the DPC finish, and also install a DPC tray 1 brick course above.

Hi, Progessing with my house extension and am now looking at the RSJ needed to go above the 4M bi-folding doors we have planned. As this is all being completed under building regs, do I need to show a SE report for the RSJ spec. Also, has anyone fitted a RSJ recently for such a span, and...

thanks, but I've already layed the inside course of blocks. So was thinking about just laying the 2 outside courses face down now and tieing into inside course with wall ties, leaving a 75mm cavity? to match the house.

thanks but 450 is fine for a single story building in firm clay....

No, theres nothing above ground, however my concrete foundation is approx 600mm below ground and I'm building off that. I also now know that my foundation block work needs to be at least 355mm to accomodate a step in the facing brickwork and the inside course. Now that I've taken delivery of...

Anyone know why you need to use a weak mix concrete 1:6 to fill between cavity walls on footings? only ask as I may need to use 3 aggregate blocks to get the width I need for my first few footings courses, thanks

Hi, Still working on the design for my extension. The footings have been poured (450mm wide). Now I'm looking at laying the first course of concrete blocks. I have the original house build drawings which state a 276mm cavity wall with 25mm wall insulation. As the first few courses of the...

thanks for all the replies and help. The photos are of the original house being built, not the new extension. Yes indeed, it looks like I'm gonna have to cut bricks down to certain widths to complete this task, cheers.

thanks, here some photos of the construction by the builders, just a shame I dont have the ones I really need. The overhang is approx 50mm so I dont think building a 9 inch wall will work, especially as I cant see any 'sideways' bricks in the house, indicating some being turned. Photos hopefully...