MrNormo

Hi Conor, Which floor is the carpet on? Can you let me know what system you used? Thanks

😂 Assuming we're lifting it all and trying again, what would be the recommendation here? Thanks

Thanks for the info and makes sense! A engineered floor is on the consideration list here. We have it on the ground floor and it has no issues getting the rooms to temperature. The system we have in place is this stuff, at 200mm spacing https://www.lksystems.se/en/products/floor-heating/laying-procedures/joist-systems/lk-heatfloor-22-slotted-board-22246450 Thanks, Oli

Part of the fun of retrofitting! I'd rather someone tell it to be straight and I've often come across your advice in previous research, so thanks for your reply. We did stuff as much rockrool as we could with the room floating over the garage. That's the only floor space that is insulated but appreciate the garage is still very cold and that will have an impact. The garage itself has a plastered ceiling but that doesn't take away from the air paths point you mentioned. For what it's worth, I wasn't very happy with the company who installed the heating on the first floor. I did do research at the time but having done more research, reflectors just aren't very effective at this application.

We had a good stab what what we thought was right for the carpet. The layering goes Carpet (1.70 tog) UFH Underlay (0.75 tog) 5mm ply UFH Boards with reflectors Good point on MVHR - I was half hoping with intake / extract ducts on the ground floor that this may distribute the heat more evenly in rooms struggling to heat?

Hi ProDave, It's a retro fit in an old house build approx '68 - '70. We stripped it right back and did a re-wire, asbestos removal, door/window replacement etc. The property is a strange shape, with one large sloped roof on one side and a smaller one on the other. Half of the first floor has a loft above it (left on the below pic). The fact these rooms stay warm and get to temp quick is what makes me think it's a first floor heating issue through the carpet. Insulation wise, I covered off in the original post but is there anything else I can give to help? EDIT: Forgot location. We're near Portsmouth which has been fitting -2 to -5 this week Thanks, Oli

Hello ReedRichards, Thanks for the reply. For the ground floor, a 40c flow rate would be fine but we see zero temperature change on the first floor if we do this. We didn't insulate under the UFH boards when installing, so I fear the heat is going down to the ground floor / ceiling void and not up. Thanks, Oli

Hi everyone, I've been lurking on these forums over the past two years and have picked up many tips along the way. I do have some issues of my own now. I have a LG Therma V 12kW ASHP along with a UFH manifold on the ground floor in screed, and another using boards on the first floor. We're using the AI mode on the ASHP which is currently floating around 48-50c based on outside temperature hitting the minuses. The ground floor has been fantastic this winter. Laughing at the outside temperature changes and seems to be holding heat at an acceptable rate too. The first floor, which is carpeted, is struggling big time. We have set a modest 17c average and we're struggling to hit that set point. The carpet shows a surface temperature of 24-25c which is around 5-6c off what the ground floor is hitting. As a result, the heating has been on 24/7 during the cold spell this week and I'm seeing figures such as £18 a day in electricity as of this week! I can think of several causes for this issue 1- The underlay and carpet on the first floor isn't as effective as the tile and wood flooring on the ground floor. There's also a 5mm layer of ply on top of the board subfloor. 2- The boarding system isn't as good as in-screed at scrubbing off heat. There is also far less floor space on the first floor. 3- Unlike the ground floor with it's XPS insulation, heat may travel both directions on the first floor. I've thought of some options. Some more radical than others. 1- Look at alternative heating methods on first floor. This could involve replacing the first floor system with something more effective, at great cost and disturbance 2- We remove carpet and lay wood flooring. This isn't ideal as we wanted a cosy bedroom 3- We retrofit MVHR, which can take heat from 2 of the rooms in the ground floor and 'share the cold' from the first floor. We could also install a post-heater into our first floor manifold for a boost. Has anyone got any advice or other ideas on this? I've been thinking about it for a while and I'm really struggling. I touched on it earlier, but the insulation is at 300mm in the loft, cavity walls filled with ecobead platinum and ground floor slab with XPS insulation with screed on top. Here is a good representation of the first floor heating situation. We dropped the thermostat down just before midday to give the heat pump a break but it didn't take long to kick in again Here is the ground floor, showing how it should be done Appreciate all your help in advance. Thanks, Oli

Hey everyone, I've been a big fan of this forum but never really signed up to it for one reason or another. We moved into a fairly original 70s house 2 years ago. Since then, we've completed a re-write, dug up the screed, put an ASHP in and underfloor heating throughout. I've also been sealing every nook, cranny and gap where I can with the aim of getting it airtightness tested at some point. We have solar going in next month with a battery and I'm considering MVHR too. I have a bit of an issue regarding the first floor heating but I'll create another post for that, as it's lengthy Nice to meet you all! Oli