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Aerogel has a conductivity about half of Celotex so you'd need 25mm. But Celotex has a BBA certificate and has been tested to need only a 25mm cavity depending on the exposure of the site. I assume Aerogel hasn't, so ur back to 50mm cavity. ie. same thickness but more expensive and you get to...

...do you regularly play games with adolescents then...? ;) J

Key thing is curtilage and not ownership. Sadly as which so much in planning its ambiguously defined. In a Minnie Mouse house with white picket fence its self evident the further you stray from that the more difficult to be definitive it gets. CofL is not necessary per se a letter to the...

buy a dictionary. J

Eye wateringly expensive.... J http://www.aerogel.com/Aspen_Aerogels_Spaceloft.pdf http://www.greenbuildingforum.co.uk/forum114/comments.php?DiscussionID=9&page=1

http://www.planningportal.gov.uk/permission/house http://www.planningportal.gov.uk/permission/responsibilities/planningpermission/permitted Our view is always work out exactly where you think you lie in regard to the GPDO then tell the LPA and get a piece of paper from them confirming they...

If you ask R@ckwool they will advise full fill, if you ask Cel@tex they will say partial. Rigid foams ask for min 25mm cavity, wool can be full fill but even with the cavity the rigid urethane foams perform better thermally per unit thickness, but are more expensive. Another issue is that...

I thought that was implicit with a combination of common sense and the rest of the sentence... sorry for any confusion... J

It depends on whether the wall needs to compensate for any other elements, specifically if the new windows and doors are more than 25% of the extension plus are of any covered up by the extension. But, assuming not, 285 is about right; you'll need a U-value of 0.28, in masonry that would be...

As I understand the property and its garden can be made up of as many titles as you like as long as they are in the same ownership. Garden tends to be defined as being within the curtilage of the dwelling and this term is referenced in the GPDO but is a bit ill defined, typically its the bit...

... you are offering one or asking for one...? :wink:

I note you mention 'applying for' not gaining... ..jus' kididng. :D I don't think either PD or PP is complicated its just a relative issue and I was referring to planning permission generally not simple domestic extensions. I remember they once asked us to to a full street elevation for...

There you go again assuming the local planing authority and planing in general is logical and consistent! Yes I agree with you entirely, that's the whole point of PD, however with the recent changes the wording of the act is nolonger as explicit and in fact introduces sentences along the...

"I agree you haven't answered any questions yet."... ...now who's trolling...? We are actually building two houses and the engineer is the owner builder of the other which has essentially the same demand pattern, in fact slightly lower. The rough and ready look for me was derived...

...thwarted... :wink: J

that is my reading also although at 1st glance you'd be forgiven for thinking so... 522.6.7 Where Regulation 522.6.6 applies [ie IF CONCEALED AND <50mm COVER]... ....a cable installed in accordance with Regulation 522.6.6 (v) [ie A CABLE IN A 'SAFE ZONE'], and not complying with Regulation...

- not sure anything's been answered yet. - the reason the electrician can't give a straight answer is perhaps that there isn't one, its compliant as far as we can tell (n the absence of any reason why not here other than you saying "No") but just looking for the hidden pitfalls perhaps? -...

I'd always go for a separate VCL then batten to suit plasterboard sizes, tape and seal the VCL to the beam hidden by batten/board zone. Alternately rigid foam to the underside of rafters foamed between rafters and joints foil taped. J

We always advise to seek the LPAs confirmation that it is PD, some will have specific application procedure for this; sometimes we have to coerce them and point them in the the right direction though. J

That's what I'd planned. Although as there's a grannie annex/office at LG floor the incoming will go straight to a switch at gd floor then back down to the annex (say 10 way board); up to a main one on the middle floor (1st) say 15 way then from this up again to the last one at 2nd floor (10...