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Author Topic: Underfloor insulation.  (Read 656 times)
pantsmachine
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« Reply #15 on: February 14, 2021, 08:49:08 AM »

Last couple of times I topped up lofts I used knauff earthwool.  Good to work with non itchy! I cant emphasise enough the benefits of hunting down all the leaks room by room with a simple ebay bought temperature gun.
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BillO
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« Reply #16 on: February 16, 2021, 02:13:55 PM »

Hi, I did a big refurb which I finished a couple of years ago. I insulated some rooms which were previously 'Dry Lined', i.e. plasterboard on battens like I think you have. I stripped off the plasterboard, fixed YBS Superquilt, taped the joins, counter-battened (all as per YBS instructions). Then I fixed 25mm Celotex and plasterboard and filled joints/ skim to finish. I calculated that the Superquilt and Celotex would give me complete draught exclusion and maximum insulation, at only about 60mm extra thickness per wall - so not losing much living space. I also installed MHRV and underfloor heating, with a large thermal store and small gas boiler/ 60 vacuum tubes on the roof to heat it.
I think the difference this has made to the comfort of the house is staggering - dual fuel bills are about 50 pcm over the year for our 4-bed house, there is only ever a scrap of condensation on the windows on the first day of a cold snap etc.
The multi-foil insulation lets you make a cocoon around your living space. It can be used on ceilings and suspended floors as well as the walls. MVHR (Heat Recovery Ventilation) is astonishing - I turned mine right down the moment the building inspector walked out the door - so you think it's not there - why did I bother to install it? But then you remember, once I lived in a cold draughty house and had to wipe every window every morning, now I live in a warm, draught free one with never a drop of condensation on the glass - you hardly know it's there but the effect is dramatic!
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todthedog
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« Reply #17 on: February 16, 2021, 03:39:35 PM »

Welcome to the forum and well done. genuflect

No central heating in my  youth, ice inside the windows was frequent.
I recall staying with my Nan and a thin film of ice forming on the loo, Council House in London in the 50's
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Kidwelly South Wales
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« Reply #18 on: February 25, 2021, 06:22:34 PM »

Hi, I've tried the netting suspended between joists stuffed with rockwool and jamming kingspan between them (have some 2 part foam handy to fill any odd gaps. Both work well, but TBH, psychologically at least, the latter worked better. I then laid 6mm hardboard, Vitrex insulation board (Screwfix), electric underfloor foil heating mats (cheap off ebay...astonishing how many people mis-measure their floors) and laminate on top. I couldn't tell you the running costs because we also have a combi and a wood stove....but the cat loves slow-cooking herself on it in the winter.
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