celotex

Gah, I’m in a pickle. I’m having internal walls and ceilings/flat roof insulated as part of my journey towards getting an ASHP/more energy efficient house. Most of the walls are 1960s build cavity walls, assumed insulated on the EPC. I’ve had an energy consultant and various builders quote...

Hi All, I hope you are doing well. I have about 32mm space before I have to cut the doors. I have 8mm laminate floor ready but I want to lay some Celotex. The concrete floor has a DPM already so I can put Celotex straight on top of it. Initially I though about putting 15mm Celotex so I can fit...

Hi I've some Celotex 150mm insulation boards left from flat roof insulation project and looking to use in loft floor which has some old insulation in. Just checking that vapour barrier is still needed and that it is ok to lay as per below image, i.e. up and over the floor joists. The Celotex...

Hi all, I'm currently starting to renovate an ex-council house with a solid wall (2 bricks thick ~22cm, no cavity). I just tore down some very old plasterboard that had suffered water damage, with the wooden battens falling apart. The root cause of the water issue has been fixed right before...

Hi, I hope I’m posting in the correct place. I am insulating existing exterior walls of my barn conversion. Building regs wants us to use 55mm celotex, 12.5mm plasterboard and 25mmx47mm battens. I am completely confused on how to do this, so many different opinions from different builders...

Hi. We have opened the ceiling in our living room which had previously the ceiling in 2.4m height, with a normal plasterboard and 10cm mineral/glass fibre mix. The outside noise was less, but still noticeable. We now want to use the full space of the pitched roof to create a vaulted ceiling...

Timber Frame annexe has cladding, battens, breather membrane, OSB, then 150mm timber frame wall Inside: celotex between studs Then what's my best option as regards insulating, vapour barrier , service voids etc A multi foil insulting vapor barrier seems a good idea ??? If constructing...

I have a timber frame structure mounted on concrete blocks around the perimeter, which are bedded on a concrete base.The concrete base has a membrane but is cut off flush. as i'm doing a solid floor inc Ufh made up of 150mm celotex , a seperation layer then UFH stapled on top , before a 75mm...

I recently got a shed built after seeing one made by the builder for a neighbour nearby. The one I saw was in good condition and no mould etc. I had the same one built. Wooden frame, concrete floor, plywood and cladding on the outside, GRP roofing and plywood inside on walls and roof. No...

Hi all, So I have some spare GA4100 celotex after using it for between the roof rafters. I should have enough remaining to provide a 100mm installation floor base and 75mm screed. Is GA4100 safe to use with ufh? Will the compression be too weak or will the foil cause issues? Ideally I would...

Hi, please can someone help me here. I’ve had my garage converted to a kitchen. Floor was lower in the garage compared to the level of the existing house. Anyway, I am having an island with a downdraft extractor. I have UFH installed and the builder has forgotten to put in the ducting for the...

Hi Garden detached room under construction . Warm roof will be used (18mm osb then 100 celotex then 18 osb) Query : Insulation with the eves at end of joist runs, as there are noggins etc please see attached Before answering - thanks

Hi I'm looking to transfer my conservatory to a proper room with a solid roof and new glazing frames. And want it to adhere to building regs so I can remove the French doors. It has electric sockets, a small radiator and electric underfloor heating under a tiled ceramic floor already so I'm...

Hi all, for our kitchen floor the plan has been to make a floating floor, as follows from bottom up: concrete, self leveling compound, DPM, two layers of insulation (the old kitchen was split in half, so the first layer is 20mm in the front half and 90mm in the rear half, and then a second...

Hello all! First time poster: I have a semi-detached house in a high water table area and I noticed that under the suspended wooden ground floor there was some standing water. I carried out some investigation and it appears that more water flows into the crawl space (approx 4ft high) in when...

Im looking to insulate my shed using celotex and just have a couple of questions in the hope of clearing up some contradictions I have discovered during research. My shed is pretty heavy duty, constructed out of 3x2 framing and 25mm T&G cladding. Ive read conflicting views about the...

Hi, First time posting here, I have taken all the plaster off on the external solid 9" walls (1930s house) and now want to insulate and redo them using celotex 37.5mm thick 2.4mx1.2m plasterboards. I have heard many stories about damp and condensation issues caused by internal insulation. Do...

Hi, After some advice / assurance of the method Im'm looking at meets some of the 'best practice' for insulating a single brick wall ensuring (if done correctly) shouldn't be any issues surround damp etc. Any advice would be appreciated or just a "yes sounds fine" or "Nooooo" :D I propose to...

Having trawled through dozens of similar questions, I imagine regulars here could probably live without another confused post about shed insulation, so my apologies, but…I’m confused. Shed is a log cabin, 44mm T+G, with a pent roof. Should this work: batten out with 25mm deep timber, then...

I'm looking to insulate my 1950s detached garage. I thought I'd start on the roof by fixing some 100mm Celotex directly on top of the joists. My main concern is about ventilation / moisture issues, which I have to say I'm not too clued up on. From reading around there seems to be lots of...