JohnBishop

I decided to put 25mm Celotex on the floor. Does £187 for 11x Celotex TB4025 Insulation Board 25mm x 1200mm x 2400mm + £60 shipping sounds reasonable? I need to cover about 28sqm. Do I still need to put this QuickStep underlayment? https://www.quick-step.co.uk/en-gb/accessories/qsudlbp15_basic-plus-15-m2#Documents By the way should Celotex go against the wall (no gap) or can it go next to the skirting?

Will it support my domestic nuclear reactor? Is it hollow inside?

Hi All, I keep wondering what is the purpose of this pedestal. It's in the living room next to the old fireplace but this was replaced with a gas heater I believe decades ago. Is this some sort of stand? There is nothing above it.

Do you mean some cheap XPS foam, all taped together then 5mm wood fibre and laminate? Would you recommend anyone in particular or is it does not really matter? I have searched for some but only found a more decent selection on Amazon which I try to avoid. I have 25-32mm space before I have to cut the doors but the problem becomes the PVC front doors in the little landing that I won't be able to cut.

Ok, I have checked the moisture under polythene some time ago and there is no condensation so the original DPM seems to work. I also don't see any humidity fluctuations in the room in the summer or in autumn. Most sell min 25mm Celotex but I found this 15mm one: https://insulationgo.co.uk/15mm-xtratherm-pir-wall-insulation-rigid-foam-celotex-thermal-board-foil-faced-12mm-celotex-tb4000/ Does it mean Celotex goes first, all tight and taped in between and then the Basic Plus underlay on top? No fibre underlay just laminate on top?

I just removed the skirting boards. Does it look like DPM to you? Do you think if I put another DPN on top is this going to be detrimental to what's below?

What XPS should I go for? I am having difficulty finding it. I need it for about 30sqm. I found this: https://www.amazon.co.uk/Foam-Insulation-Boards-1200-10mm/dp/B07X3LWJS2/ref=sr_1_8?crid=XVH0B83U7ZDG&keywords=xps+foam&qid=1668442671&sprefix=xps+foam%2Caps%2C96&sr=8-8 Is this any good? Should I use anything with the silver thermal reflecting foil? I also order this 10mm laminate: https://flooringwarehousedirect.co.uk/product/qa-breathe-natural-fibre-10mm-underlay-15m2-roll/ I put a DPM barrier on the concrete floor as I have it already. I unscrew the wide skirting boards and attach the DPM to the wall then screw the boards back.

Hi, I bought this 10m Ultraflex 904 and it was fitted by the roofers. I cut off about 1 meter but the next day the liner slid by about 40-50cm. I don't want to cut another 40-50 cm in case it disconnected from the top. Can it disconnect from the cowl and stay in the chimney? This is pretty stiff liner but it's also heavier than standard 316.

Ok I got the 904 Ultraflex fitted I cut off about 1m of it to fit the adaptor while I wiggled it it went down by about 40cm. How do I know that it didn't disconnected from the top? It's not a straight chimney but a bend or even two. I wasn't pulling it. I am not going to cut another bit then to find out it disconnected and now it's too short. This 904 is quite stiff, hard to work with. Tomorrow I am going to fly a drone next to the chimney pot to see if I can see anything.

On the other side it is neighbour's gas heater inside his chimney breast so not sure how does this look inside. The roof and chimney has been fixed now so there should be no more water getting in from above.

Hi Everyone, I have these on the chimney part wall. When I knock on it it sounds hollow comparing to the plaster above. Should I just remove and put some new plaster? Is this penetrating dump from the ground or from the leaky chimney? Best regards

Ok, thank you. Yes so the number I used is correct 1024hPa

Where can you see the pressure on WeatherUnderground? I see Pressure but it's given as 30.27 in From https://www.forecast.co.uk/pressure/ it's 1025 Absolute humidity, kg/m3 - 0.008 (outside) Absolute humidity, kg/m3 - 0.009 (downstairs) Absolute humidity, kg/m3 - 0.011 (room 1 upstairs) Absolute humidity, kg/m3 - 0.010 (room 2 upstairs)

Ok, thank you for your replies. I have 4 measurements at the moment: 18.9C 51% (downstairs) 19.2C 53% (upstairs, room1) 17.6C 65% (upstairs, room2 but an opened window - some cold air and humidity is coming in, outside it's 12.3C 79%)

One of the sensors was on the window sill the other is a bit further away from window (2nd room). I reckon moisture level is higher closer to the window where vapour likes to condensate. I put both on the floor away from windows. Will see if there is any big difference.

In my case there is no baths for a couple of days and even then the window is opened to let the excess moisture out. I have lived in a flat before so not sure how this works. Is it possible the moisture makes its way upstairs and there always be that discrepancy? I have 4 temp/humidity sensors, 1 downstairs, 2 upstairs (2 different rooms) and one outside (North side). Two sensors upstairs are off by about 3% (59% and 62% respectively). I have the display in front of me so my readings are regular not just one off. I was just wondering if there is any of the sub floor heating or water pipes slowly dripping maybe? I have not seen any wet patches anywhere but if the rate is slow enough the sub floor dust absorbs it.

Let's say there is a moisture barrier under the concrete already. Isn't that detrimental to the concrete floor if you put another? I mean then it is expected for moisture to collect in between the barriers. I am going to tape a bigger sheet of DPM to the concrete with a temp and humidity sensor under to see if there is any variation. I think I put a black DPM then the XPS. I read that 1 inch of XPS is considered to be vapor semi-permeable, while 2 inches is considered to be vapor semi-impermeable. What XPS should I go for? How thick 6 or 10mm? What 10mm fibre should I use? https://flooringwarehousedirect.co.uk/product/qa-breathe-natural-fibre-10mm-underlay-15m2-roll/ but I reckon I still need to put 5mm Fibreboard Laminate boards on top as the laminate click is likely to disengage on softer underlay.

Interesting it says it's automatic without any electrical or mechanical power.

I am a bit baffled why there is almost 10% higher humidity upstairs than downstairs? I know there is a bathroom but it has not been used while I measure the humidity.

Hi Nick, these trickle vents have no control, fully open all the time. I know what you mean however a single person at 84sqm does not cause that much condensation.

Hi, I have moved to a property that has ALL windows with trickle vents. On top of a wide ventilator in the kitchen and a smaller in the bathroom there is also an air brick in the living room for the old gas burner (removed long time ago). This and the trickle vents on all 9 windows makes the draft like in a dog's shed. I think dog's shed is actually better. I have already blocked the air brick but I have to address these trickle vents. Before these windows are going to be replaced in a year or two I have to stop the draft. Duct tape gives me mixed result because the small gap between the trickle vent cover plastic and windows frame is still leaking some air x9. These Slotvent trickle vents cannot be removed. These are screwed in and I cannot remove the screw caps. Should I just destroy these screw caps, remove the vents on both sides and duct tape holes on both sides and put the trickle vents back in OR instead put some expanding foam into the holes in the window frame through the intake of the trickle vent? Let me know what you think

I am still looking for the right underlayment to put on the concrete. I have 32mm gap between the concrete floor and doors. and 25mm in the other room (both concrete). I reckon there is a DPM under the concrete as the humidity at ground level hasn't changed, it's stays at 50% but anyway most of these underlayment comes with DPM anyway. I was looking into this: 3mm https://www.factory-direct-flooring.co.uk/pro-gold-underlay-vapour-barrier 5mm Sonic Gold https://www.amazon.co.uk/Royale-Comfort-Underlay-Laminate-Flooring/dp/B00EZMY36G/ref=sr_1_5?keywords=sonic+gold+underlay&qid=1665958023&qu=eyJxc2MiOiIzLjg1IiwicXNhIjoiMy4wOSIsInFzcCI6IjMuMDAifQ%3D%3D&sprefix=sonic+gold+un%2Caps%2C94&sr=8-5 6mm https://www.amazon.co.uk/Underlay-Thermal-Insulation-Underfloor-Heating/dp/B07HPD2TBB/ref=sr_1_4?keywords=insulating%2Bunderlay&qid=1665956825&qu=eyJxc2MiOiIzLjkxIiwicXNhIjoiMi45OCIsInFzcCI6IjAuOTIifQ%3D%3D&s=diy&sprefix=insulating%2Bunder%2Cdiy%2C74&sr=1-4&th=1 10mm (I reckon this is only for the carpet not laminate) https://www.amazon.co.uk/10mm-Thick-Insulation-Carpet-Underlay/dp/B00EZMXOWK/ref=sr_1_20?keywords=insulating+underlay&qid=1665956825&qu=eyJxc2MiOiIzLjkxIiwicXNhIjoiMi45OCIsInFzcCI6IjAuOTIifQ%3D%3D&s=diy&sprefix=insulating+under%2Cdiy%2C74&sr=1-20 I reckon there is no thicker underlayment for laminate than 5mm. Sonic Gold has very good reviews. I reckon I don't need wood fibre boards for this just the sonic gold. Please let me know if there are any better options or if I am on the right track. I am back as I want to do the downstairs and have to decide on the underlayment I put on the concrete.

The chimney is there, it's just that above second floor there is a temperature drop in a chimney that is inside not outside the building (part wall).

I want to resurrect this topic just before the liner installation. I have taken vermiculate into consideration however because the chimney is on a party wall the temperature in the chimney won't be that low to cause condensation and tar build up. However I was thinking about part of the chimney from the loft to the top. Would it make sense to at least cover the liner in this Rockwool insulation on the last 4-5 meters where the chimney is getting cold? The chimney twists so the insulation would sit on it's own on the first bend. What do you think?

what do you think about these IBC covers on eBay? https://www.ebay.co.uk/itm/125196937973?hash=item1d2651aaf5:g:X8YAAOSwMtJiLDcQ&amdata=enc%3AAQAHAAAA4J28Q2gIVQXTpVngJWFNq%2FE8Zcy1Vmhqb3cFD6BzA%2Bx2lOkgPdpacHxGqzwdG6LGC0q%2FgXgqN7lR4SA9xDPAB5P2oOF%2FFEc9myuMbAGY26qP8D%2B9pS%2Bw7skC1Ofe4HzFVj9kKSnW4JxVehi5%2F4WdFsZdy0e7jIWDdJix3cdwj3oMtt6crE3r9%2FBHIgY5DtTLwmzswA7WlwzAD3CvheME5d99oxve2yONUN9trOnUhWkvHl4YWmjTS8aMNNIRoMsccC6%2F3kfSBOjOgHjqQDPmWlRdjmd4thkD5QMl9TQ9T70D|tkp%3ABFBMrOKM3-hg