CC45 Posted August 3, 2020 Share Posted August 3, 2020 looks ok to me (not an expert). The only thought I have is about the PIR on the inside of the rockwool - if you are layering different types of insulation aren't you meant to have the best insulator on the outside? This could be complete rubbish but its in my head for some reason. Others more informed than me will know the truth I'm sure... Link to comment Share on other sites More sharing options...
Russell griffiths Posted August 3, 2020 Share Posted August 3, 2020 48 minutes ago, CC45 said: looks ok to me (not an expert). The only thought I have is about the PIR on the inside of the rockwool - if you are layering different types of insulation aren't you meant to have the best insulator on the outside? This could be complete rubbish but its in my head for some reason. Others more informed than me will know the truth I'm sure... As far as I’m aware you generally have the least vapour permeable insulation on the inside with more permeable on the outer, so vapour travels out of the structure instead of being able to get in but cannot get out. 1 Link to comment Share on other sites More sharing options...
CC45 Posted August 3, 2020 Share Posted August 3, 2020 agreed - I wasn't talking about the vapour aspects of PIR. I was just wondering about the temperature of the vapour as it 'flows' through the wall, where will the dew point occur? Will it be within the wall structure? Need @Jeremy Harris to chip in on this I think. I'm sure the outside layer should have the highest insulation value fo rthis reason. I could be wrong. Link to comment Share on other sites More sharing options...
Russell griffiths Posted August 4, 2020 Share Posted August 4, 2020 9 hours ago, CC45 said: agreed - I wasn't talking about the vapour aspects of PIR. I was just wondering about the temperature of the vapour as it 'flows' through the wall, where will the dew point occur? Will it be within the wall structure? Need @Jeremy Harris to chip in on this I think. I'm sure the outside layer should have the highest insulation value fo rthis reason. I could be wrong. If this was the case, every timberframe company that puts pir on the inside of there rockwool filled frame would be in trouble as this is a fairly standard detail from a lot of timberframe manufacturers. Link to comment Share on other sites More sharing options...
CC45 Posted August 4, 2020 Share Posted August 4, 2020 12 hours ago, Russell griffiths said: If this was the case, every timberframe company that puts pir on the inside of there rockwool filled frame would be in trouble as this is a fairly standard detail from a lot of timberframe manufacturers. OK, not had any company involved so not seen that detail before. Link to comment Share on other sites More sharing options...
Simplysimon Posted August 4, 2020 Share Posted August 4, 2020 13 hours ago, Russell griffiths said: If this was the case, every timberframe company that puts pir on the inside of there rockwool filled frame would be in trouble as this is a fairly standard detail from a lot of timberframe manufacturers. agree, though that doesn't mean it's right. putting insulation inside the property has to bring the dew point closer to the inside. i have a feeling there is going to be a large problem in the future with internally insulated properties. this is also assuming the vcl has been done correctly and is stopping moisture entering the kit, want to hazard a guess as to the percentage which have a correct vcl? Link to comment Share on other sites More sharing options...
Onoff Posted August 5, 2020 Share Posted August 5, 2020 On 03/08/2020 at 13:53, NickB said: I had to make some amendments to accommodate the drop in height for the garage. Do these look ok with the wall sitting on the floor like this. Where is your vcl in this section...or isn't there one? 1 Link to comment Share on other sites More sharing options...
NickB Posted August 18, 2020 Author Share Posted August 18, 2020 Sorry for the slow reply. Yes there is one, it just isn't detailed but will sit over the PIR liner and behind the service void. Link to comment Share on other sites More sharing options...
NickB Posted September 25, 2020 Author Share Posted September 25, 2020 I thought I would update this with some pics. We pretty much have done it as the above drawing. Engineers drawing is attached too if it helps anyone else. 5 Link to comment Share on other sites More sharing options...
Mr Punter Posted September 25, 2020 Share Posted September 25, 2020 Imagine if the volume housebuilders did it the same as @NickB. There would be lots of very happy customers. Link to comment Share on other sites More sharing options...
NickB Posted September 25, 2020 Author Share Posted September 25, 2020 Haha, thanks! The brickes kept telling me it must be the most level block-work in England as i checked everything with the lazer level a thousand times until it made a very satisfying beep! Link to comment Share on other sites More sharing options...
Big Jimbo Posted September 25, 2020 Share Posted September 25, 2020 That looks like the dog's bits. Love it. Link to comment Share on other sites More sharing options...
Jason L Posted October 28, 2020 Share Posted October 28, 2020 Hi , i notice that your 'z' vents have ben built on the outside of the blockwork, how are you going to accommodate them now, as i am just trying to resolve this detail ? 2 Link to comment Share on other sites More sharing options...
DragsterDriver Posted May 2, 2021 Share Posted May 2, 2021 On 28/10/2020 at 20:31, Jason L said: Hi , i notice that your 'z' vents have ben built on the outside of the blockwork, how are you going to accommodate them now, as i am just trying to resolve this detail ? same. in the outer insulated plinth? Link to comment Share on other sites More sharing options...
NickB Posted May 20, 2021 Author Share Posted May 20, 2021 (edited) Sorry for such a slow reply. I'm not sure how useful this is now, but this is how we are doing it. We are using eps to the sides of the ductwork and then using some 3/8" thick 150mm aluminium that we have bought pre powdercoated from a supplier we have been using. The holes will be cut for the vents and then these vents will tidy up the holes: https://www.amazon.co.uk/gp/product/B08TC9HCH6/ref=ppx_yo_dt_b_asin_title_o01_s01?ie=UTF8&psc=1 Also, we have added 75mm of rockwool EW to the entire exterior of the house to put any steels inside the thermal envelope and use simpson strongtie brackets to take the cladding using 5mm thermal breaks. The insulation is wrapped in solitex fronta quattro with an open siberian larch cladding with 6mm gaps to keep it nice and ventilated. Edited May 20, 2021 by NickB 1 Link to comment Share on other sites More sharing options...
Patrick Posted May 30, 2021 Share Posted May 30, 2021 On 25/09/2020 at 15:17, NickB said: I thought I would update this with some pics. We pretty much have done it as the above drawing. Engineers drawing is attached too if it helps anyone else. What are the flanges you put around the service pipes? Where you find them? Link to comment Share on other sites More sharing options...
Russell griffiths Posted May 31, 2021 Share Posted May 31, 2021 Gaffer tape Patrick my boy. Flanges only needed for a gas membrane not for damp proofing. Link to comment Share on other sites More sharing options...
jntabbycat Posted September 9, 2021 Share Posted September 9, 2021 On 03/08/2020 at 13:53, NickB said: I had to make some amendments to accommodate the drop in height for the garage. Do these look ok with the wall sitting on the floor like this. Hiya, just came across this while looking around. Did you run the Marmox block under your external door thresholds too? Our door threshold will be level with the internal floor which means the screed will be above the timber sole plate (not sure if that’s ok or not) unless I delete the marmox where the door is. hope your project went well looks impressive in the photos up to damp. Link to comment Share on other sites More sharing options...
Bretty85 Posted November 19, 2021 Share Posted November 19, 2021 Hi, im building a an extension also using block and beam and with a timber frame structure above. Can anyone comment on fixing through the Marmox thermoblock breaking the DPM? I was planing on chem fixing the sole plate of the timber frame through the thermoblock into the blocks bellow but am concerned about pieceing the DPM. Thanks, Link to comment Share on other sites More sharing options...
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