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If I build an extension wall to spec with 100mm cavity do building regs require that I insulate the existing wall too or is a wall that already exists allowed to stay as is? It's around 65mm cavity. I'm not exposing the cavity, just using wall starters on it with vertical dpc

Ok thanks for that. Seems a good idea especially with drain pipes.

Hi I’ve read a lot about setting back an extension wall when your house is imperial and bricks are metric. Can anyone explain what this means? Any example pictures? I don’t fancy large mortar lines but just wondered if this is a good option in my circumstances. Cheers all

Ok, thanks, I'll use dpm then and weigh it down with hardcore or similar

Hi, Just wondered whether it's a definite requirement to lay a concrete floor before using suspended timbers in an extension? I'm sure I've read here that you can put a permeable membrane down with gravel over it which then allows any moisture to drain? Is that still possible or do I have it...

Yes, I've had a look and around 75% of it is within 1m but I can excavate down 150mm below to prevent loading. I'm then planning to bridge the remainder. I'll get the BCO to agree to it once I get the first visit done. Wessex's document allows this as a method so I hope it won't be too hard...

I’ll have to give it some thought. Normal foundation pour and then lintels across the corner are certainly easier and cheaper. Not sure how easy it is to change this now though as Wessex and the council have agreed with it. Is it something a BCO can advise on if I raise it?

I think the whole area is to be bridged due to the corner point load and then the sideways load from the rest of proposed building. I've asked the SE about sizing it to 140 and whether they need to be butted together or can be spread to say Lintel - 50mm Gap - Lintel etc.

Yeah I've contacted the SE to see what the score is and what options there are. I'm presuming he wants the lintels 150mm upright so maybe I can get ones which are a different width. Or change to the 140 standard. I'm no specialist with se but I think this is overkill. Trouble is the water...

I am where I am. He is qualified, I've checked.

Is it? 100w x 150d, 1.8m length? Links welcome as I can only find them at around 50-60 quid and I need quite a lot if I have to butt them together over 4m :)

They're that long due to the design and what's needed so that the building sits on top of them. It's a clipped build over. 1 by adwt2004 posted 25 Jan 2018 at 3:01 PM I guess making the extension longer could shorten them but then it falls foul of PD.

Hi, I'm curious about what lintels you guys use to build over a sewer. My SE has specified 100wide, 150 deep, 1.8m length. Presumably they will be sat on the blocks either side tall side up. Is this the sort of specification that normally is prescribed for this? It's single storey rear...

Thanks Woody, appreciated.

Hi guys, Can anyone tell me about the DPC positioning for a setup like below wall joining by adwt2004 posted 23 Jan 2018 at 2:45 PM I am planning to run two layers of dpc, one for each course and where the new wall meets old turn it up vertically around 6 inches. Is that the best way to do...

Thanks

Hi Guys, Anyone recognise this particular type of brick? I want to order a couple of thousand so just wondered if it's still available.