celotex

New single storey side extension (wc/ utility & office) with tiled pitched roof (inc breathable membrane/felt) with rafters & ceiling joists So small void /storage area potentially all be it small, and insulation is priority Double skin (Con. blocks, cavity insulation , Fenlite Con blocks,)...

House renovation with new extension New Floor / oversight on new extended room Replacement floor on existing part of house , with new oversight /membrane. Floor being hacked up Underfloor heating within new screed on all ground floor on one level Assuming Finished floor levels are correct and...

Hey, I’m looking at doing a project house, it’s a 1960’s ex council house, i believe it has a non insulated cavity wall & I’m thinking of internally battoning off the walls and adding celotex in between to help keep some heat in, will this work without causing any kind of sweating / damp...

I have a 4.3m x 3.4m outbuilding, single skin block & some brick. Floor has DPM under concrete, I’ve also done a DPL round corners & then self level. I have also gone round an drilled plenty of air vents. The plan: I have got plenty of 2x1 batten lengths so batten around room (DPM behind &...

Hello, could do with some advice if possible. I am interested in buying a detached property which is roughly 100 years old. No DPC has been fitted. But instead 62.5mm of Celotex has been fitted throughout the house. (The house was renovated over the last year or so) The house is known to of...

So I got a single skin outhouse with a dpm below concrete and I’ve tanked it for good mesure. Plan was to 2x1 batten out walls at 400mm apart with a dpm strip behind & not touch the floor with them. Then 50mm PIR celotex over the top to create a small cavity (taping joints) then foil back...

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...