Polish Builder

PIR boards are made from polyisocyanurate foam, which is a higher density rigid foam than expanded polystyrene. PIR rigid foam has better thermal insulation properties than polystyrene. PIR insulation in 100mm thickness is approx. 30% better than 100mm EPS in terms of r-value. PIR insulation is more effective at resisting heat flow than expanded polystyrene so even if you will go thicker with eps it won't be the same. PIR in theory should be better in terms of energy efficiency and cost savings in heating and cooling. If you need acoustic insulation I would go for rockwool rwa45 between the studs or acoustic roll on metal frame and blue sound plasterboards with sealant over it. If you need thermal insulation mostly and a bit of acoustic I would go for pir insualted plasterboard

you might end up with few cracks here and there

If you need acoustic insulation I would go for rockwool rwa45 between the studs and blue sound plasterboards with sealant over it.

You can go for Promat Promafour board but they are very expensive as they are designed for fireplaces and wood burning stoves. Also using a promat you need to use their filler, glue and it would cost a fortune. Personally, I would go for a cheaper option using rockwool ablative coated batt combined with 6mm a1 multipurpose board. I got it installed 10 years ago and it works well, the board behind the stove is covered with black fire paint. See below:

you can take a look on bison composite batten cladding

EPS and PIR are two different types of insulation materials, and they have different properties that affect their insulation performance. EPS insulation has a lower thermal conductivity than PIR insulation, meaning it is less effective at insulating heat. A 300mm layer of EPS insulation will have a thermal conductivity of around 0.038W/mK, while a 100mm layer of PIR insulation will have a thermal conductivity of around 0.022W/mK. This means that a 100mm layer of PIR insulation will provide a higher level of insulation than a 300mm layer of EPS insulation. However, EPS insulation can have other advantages, such as being more affordable and easier to work with than PIR insulation. EPS insulation is also a more sustainable option, as it is made from recycled materials and can be recycled at the end of its lifespan.

as far as I know 160mm is not available so you can go for 2 layers of 80mm or 165mm but thick boards are very hard to cut and fit.

I used standard alu vented track and drip with mesh.

You'll need to shop around and get some quotes to compare prices and labour costs which are ridiculous these days... You can chat to them: https://www.sipsdirect.co.uk/technicalinformation/ https://www.kingspan.com/gb/en-gb/products/structural-insulated-panels-sips/kingspan-tek/kingspan-tek-building-system https://insulationgo.co.uk/148mm-structural-insulated-panel-sips-pir-and-osb-8x4-sip-9mm-oriented-strand-board/ In theory should be cheaper than conventional brick construction but I don't know if it would be as good as traditional brick wall. In terms of electrics it is possible but should be pre-planned to avoid drilling and cutting panels (to avoid thermal bridging) It's a bit complicated but hope it helps a bit.

I would suggest RCM Multipurpose (referred to as Superflex) is referenced as a suitable render carrier board for the External Wall Insulation Systems in the following construction types: lightweight steel frames, timber frames, modular, offsite and concrete frame. (6mm/9mm/12mm) https://insulationgo.co.uk/rcm-multipurpose-a1-non-combustible-fire-rated-cement-building-board-8ft-4ft-superflex-6mm/ or you can go for aquapanel outdoor but is not fire rated board https://www.travisperkins.co.uk/discontinued-lines/knauf-aquapanel-exterior-12-5mm-x-900mm-x-2400mm/p/725614

If the product has higher density it means better acoustic / sound performance. rolls will give you between 10-22kg/m3 density. Insulation APR Rolls adapt to any slight imperfections in the substrate and knit together, eliminating any air gaps (thermal bridging). The absence of air gaps is crucial to achieving a high level of performance in the relevant application. Sound Insulation provides a high level of sound absorption, whilst also improving the thermal and fire performance of the floor, wall or partitions. Acoustic Roll is particularly effective at preventing the hollow sound that can occur in partitions with unfilled cavities. https://insulationgo.co.uk/100mm-ursa-terra-acoustic-insulation-roll-sound-insulation-apr-partition-walls-floors/ slabs from 45kg/m3 up to 100kg/m3 - designed for use in a variety of applications including internal partitions, timber and metal studs, and in between timber rafters and floor joists. https://insulationgo.co.uk/75mm-rs45-knauf-rock-mineral-wool-building-slab-45kg-density-acoustic-insulation-multi-application/ https://www.insulationexpress.co.uk/rw5-acoustic-insulation-slab https://www.insulationexpress.co.uk/blog/soundproofing-insulation.html stone wool products work in two distinct ways to reduce noise, either by impeding the transmission of sound through an element of the structure or by absorption of sound at the surface.

Maybe HX Plus for use beneath reinforced concrete floor slabs to protect against the potential effects of ground heave... 365mm HX Plus is a combination of 215mm Cellcore HX S Under Slab EPS bonded to 148mm Filcor EPS100 and protected by an ultra thin 2mm twin fluted polypropylene sheet on the top which is strong enough to actually walk on during installation. 365mm Cellcore HX Plus thermal resistance is 4.17m2c/w based on the 148mm Filcor EPS100 insulation layer incorporated within the panel. https://cordek.com/products/cellcore-hx-plus https://cordek.com/uploads/standard_details/ground_heave_sd_cellcore_plus_high_heave.pdf https://insulationgo.co.uk/365mm-hx-plus-cellcore-under-concrete-floor-slab-eps-insulation-board-insulated-heave-protection-grade-9-13/ https://insulationgo.co.uk/blog/cellcore-hx-s-plus-insulated-void-formers-eps/

Insulation Deck Flat Roof Insulation All edges should be supported - add noggings where necessary. Stagger fixings where boards are butted. Boards should be embedded in vapour resistant mastic to provide a vapour control layer in conjunction with foil facing. Mastic should be laid wide enough to facilitate 2 panel edges and be continuous around all edges. OSB Insulation Deck should be staggered and butted. Each edge should have a minimum bearing of 20mm on joist... osb pir board: https://insulationgo.co.uk/129mm-xtratherm-flat-roof-thermal-ply-pir-9mm-osb-deck-eco-insulation-rigid-vcl-decking-td4000-tr31-board-126mm/ ply pir board: https://www.roofingoutlet.co.uk/collections/flat-roof-insulation-boards/products/warmline-insulated-decking-board-126mm ply pir board: https://insulationgo.co.uk/126mm-xtratherm-frtp-flat-roof-board-ply-pir-6mm-wbp-plywood-insulation-rigid-vcl-decking-td4000-tr31/ ply pir board: https://www.insulationshop.co/126mm_eco_therm_eco_deck.html Warm roof insulation fixings explained: nails : https://insulationgo.co.uk/195mm-headed-helical-flat-roof-nails-warm-roof-fixings-pack-of-25/ roof decking: https://insulationgo.co.uk/blog/osb-deck-ply-board-sip-pir-insulated-kingspan-tr31-celotex-td4000-recticel-plylok-xtratherm-fr-tp-99-109-119-129-mm-8-4-2400-1200/

Hi @Porthole I used rock mineral wool non-combustible material with standard 45kg density in my extension to reduce the sound and get additional fire protection. Maybe that's the reason why they build stud frame to fit insulation slabs between the studs and then screw the plasterboards to skim it over. In my opinion RS45 or RWA45 will do the job there is no point using higher density insulation slabs (RW3 60kg or RW5 100kg density per m3) Fairly easy to find local supplier: https://insulationgo.co.uk/100mm-rs45-knauf-rock-mineral-wool-building-slab-45kg-density-acoustic-insulation-multi-application/ https://www.travisperkins.co.uk/cavity-and-internal-wall-insulation/rockwool-rwa45-semi-rigid-acoustic-insulation-slab-100mm-x-1200mm-x-600mm-2-88m2-pack/p/961938 https://www.ccfltd.co.uk/framed-wall-insulation/rockwool-rwa45-100mm-acoustic-insulation-slab-1200mm-x-600mm/p/961938

Best way would be to use some of components from External wall Insulation system. 1. Cut out crack. 2.Apply ZU Adhesive. 3.Apply reinforced mesh CT325 then use ZU adhesive again. 4 Next day you can prime this with Ct16 or PVA.. 5.Wall filler and final Coat of paint. Perhaps someone is doing External Wall Insulation next door? Worth to go and ask for small offcuts. If not try to find products there. Insulationgo LTD. Look for EWI section www.insulationgo.co.uk