Warrentdo

Thank you for that link! superb. So it looks like I can get 0.174W/mK. ive had to use Ytong (0.16 W/mK) instead of celcon standard 0.15 W/mK 7kg Also the K108 i want (0.019 W/mK) is better than the K8 listed (0.021 W/mK) Any more for anymore? I'm I ok to order? Regards Warren.

DPC is already in so im afraid im stuck with a 150 cavity! I have found Kingspan 108 (0.019 W/mK) if that helps? 102.5 Brick 150 cavity 100 Kingspan 108 (0.019 W/mK) 100mm Block 0.15 W/mK I've also seen that people have used a 10mm residual cavity. i.e. 100 cavity, 90mm insulation leaving a 10mm gap? I have already got a 150 cavity so could I stuff more than the noted 100mm in it? What could I do with what I've got? Regards, Warren.

Hello, Part 2, now the walls. 102.5 Brick 150 cavity 100 insulation Eco cavity partial fill (Cavity) 0.022 W/mK 100mm Block 0.11 W/mK or 0.15 W/mK 0.11 W/mK block should give me 0.15 W/mK 0.15 W/mK block should give me 0.16 W/mK Does anyone have any recommendation on the block and if its worth it i.e. losing the ability to fix things to it. I'm also getting different thermal efficiencies with every online calculator I use. Regards Warren

Hello Guys, moving on with this. Insulation, for the same price 100mm Kingspan K103 0.019 W/mK or 150mm Celotex XR4000 0.022 W/mK 150 for the same money but lower W/mK 150mm Eco Versal 0.022 W/mK 150 for the same money but lower W/mK higher crush strength. Warren.

Sorry although I mentioned walls not built, they are built to DPC. Wish I thought of block and beam before!

its what's spec'd on the drawing, but I can challenge. I was thinking of a top thinner screed so that it heats up faster?

I agree, not DPC but vapour barrier and to stop screed finding its way under the insulation as well?

Hello Dave, thanks for the info. The concrete is on top of the sand bindings, insulation then on top of conc. I was worried with EPS of point loading due to thinner screed. New walls not built yet so thought lapping DPM over top of DPC then wall on top. not sure what to do on existing wall.

Hello, I could really do with some advice. Plans don't give the detail and I'm trying to get into the detail as im doing this myself. Extension is being built with one corner having 2 existing walls and other opposite corner two new walls making a rectangle. Does the following build up look ok? Floor 0.18 w/m2k Liquid screed 55mm - 75mm liquid screed (im looking for help on type). 25mm perimeter insulation on this section only. UFH Vapour Barrier 500 gauge / 125mu Polythene sheet. To overlap Liquid screed vertically? Insulation 100mm Kingspan K103 100mm 0.019 W/mK (taped joints) or Celotex XR4000 / GA4000 0.022 W/mK (taped joints) DPM 1200 gauge / 300mu (0.3mm) polyethylene sheet. overlap all DPM vertically? Concrete C20 150mm. DPM 1200 gauge / 300mu (0.3mm) polyethylene sheet. laid above DPC in new walls. How do I tie into DPC in existing walls? chase in or bond? Sharp Sand 25-50mm? MOT Type 1 150mm min (or what ever required to meet FFL). Thank you for taking the time to look and help a newbie. Also sorry if I have posted in the wrong section. Regards warren.

I think my terminology of conservatory maybe misleading. 150 cavity wall, warm roof 5mtr sliding doors on front. Existing French doors and sliding doors leading to old conservatory being taken out leading to new. drawing just says 'Refer to specialist heating design for position of radiators etc. Please not the client is considering the option of underfloor heating to the extension and this will affect the position f the insulation and whether a screed finish will be require.' Its all a little to grey for me hence my left eye is starting to twitch. I feel that I will have many asks on this site to clarify. Regards Warren.

Hello all, I’ve currently pulled down an old conservatory and intend to replace it with a new conservatory with under floor heating (approx. 3.5x7.5 mtr). I have planning (needed because it touches another extension to the main building) and building regs. The footings are in and I’m nearly at DPC. I’m self-building due to a number or reasons, Cost, control, because I hope that I can. I have been searching multiple places for information, my architect, building officer, NHBC, internet etc. but because I lack the experience I’m struggling finding the finer detail or at least selecting the correct finer detail. I understand that the Building inspector is king but there are so many ways to do something. What makes it worse is that I’m an Engineer and it’s the finer detail that I rely on but I admit that sometimes I go completely over the top for sometimes no need. This site seems to have all areas covered and looks to have a fantastic wealth of knowledge. Please forgive some of my forthcoming post and just blame it on an Engineering having OCD! I look forward to all of your advice and help as I need all that I can get. Best regards Warren.