Green Building Bible, Fourth Edition |
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Posted By: MarkyP
in a nutshell - existing long bungalow with poorly fitted CWI to around 75mm thick with blockwork/rendered walls. Planning to fit an additional 100mm - 125mm (thickness limited by existing eaves overhang) of enhanced EPS (the grey stuff in the pic James posted above) then finish with a render coat. The pic above I'd seen before on other threads, planning to do the same and dig out down to top of footing and take EPS right down. I will take 125mm ESP down to DPC level, then maybe 100mm or 90mm below down to top of footing to allow a step/drip detail. Will use the slab method below ground to keep the rodents out. EPS will be adhesive fixed. EPS is cheap and I will be DIY fitting it and possibly DIY rendering it so I've decided to actually EWI the new extension while I am at it which is being built now with blockwork CWI walls. The EWI will help me address a bunch of limitations of the CWI including cold bridging by ties and catnic type lintels, and the various gaps in the insulation and huge mortar snots bridging the cavity left by the brickies. I did my best to check the cavity as they went along but I've no doubt there are a few undiscovered sins hiding in there. The archtitect, the brickies, the joiners, BCO - everyone, they all think I'm a bit bonkers doing this. I've had a mixed bag of quality in terms of the trades on the job but all of them without exception have no idea about detailing for enhanced thermal performance.
Posted By: tonyI would rather see eps below dpc
Posted By: gravelldI think we are on clay. How do people go about surveying this type of thing?
Posted By: gravelldI thought the point of a french drain was to have some way at the bottom of diverting water into a proper drain?
Posted By: gravelldhow quickly should it drain?
Posted By: gravelldThanks. Assume you should do it at different times of year, and how quickly should it drain?
Posted By: djhPosted By: gravelldI thought the point of a french drain was to have some way at the bottom of diverting water into a proper drain?
Into a soakaway or an exisiting waterway for preference (with permission)
Posted By: RobLIf we ewi, i'd put the lead flashing on all the way around at the bottom, it's easy, and it works pretty well.
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