Hello all;

Following on from my earlier threads, I am now applying for permission for extensions and decking and re rendering and insulating the house. So i have begun to look around for suppliers for insulation for the EWI, but am running into problems actually finding someone to supply the thicker versions of kingspan.

I wanted the kingspan EWB K5, in 100mm for the upstairs giving a nice cosy U value of 0.18 and in 120mm for the downstairs giving a U = 0.15. However calling around all the insulation suppliers the same story is heard. They will supply me the smaller sizes but 100mm is only available in 500m2 runs and 120mm isnt at all!

Ive looked at the cheaper TW53 from kingspan, but this is a cheaper and poorly performing version, I may as well just go for a thinner K5 board than this one. The same applies for the celotex SW3000, this is similar price to the K5 but just doesnt perform anywhere near the same, U value for 100mm is 0.26.

Can anyone help? Is there a company that orders 500m2 at a time and distributes it in smaller quantities?

Why not use polystyrene? It is cheaper and available in greater thicknesses.

I have used 120mm thick foil faced pir boards so they must be available

Posted By: eniacsthe house has eaves very close to the guttering so would probably only allow a sensible gap of around 100mm for insulation

Whilst the house is scaffolded it will allow you to look at the high level connection of insulation in particular EWI to roof, so stripping back the first few course of tile are essential, and extending the insulation over the top of outer brick course (assuming you have one) and up over wall plate into loft. Whilst all this is being done they may an opt unity to extend rafters to allow for EPS. As Tony said easier to get hold of. Cheaper and the conductivity of platinum EPS is 0.030 not so far away from PIR.

eniacs,

I too have been looking for EWI, theres some 60mm EWB K5 slight seconds on ebay (link below), cheaper than new. The saving could pay for someone to fit 2 x 60mm boards instead of 1 thicker sheet?

As tony says, stagger the joints on both layers of boards. I dont think it would be a bodge job, ive heard of people doing it before.

http://www.ebay.co.uk/itm/160-X-INSULATION-BOARDS-KINGSPAN-KOOLTHERM-K5-PHENOLIC-60MM-THICK-0-6M-X-1-2M-/160882495337?pt=LH_DefaultDomain_3&hash=item2575580f69

Thats exactly how i intend to install my EWI, rates from approved EWI installers seem excessive.

I would say if your looking for a thicker pir board, the board may cost more than the render. From my research supply only for adhesive, fixings, base coat, mesh & acrylic render is going to be circa £15m2

Have you tried going to any EWI system companies to purchase the insulation along with there render as a complete package? Parex, Weber saint Gobain, STO, Wetherby building systems? they may have more leverage on getting thicker sheets from suppliers?

Wetherby building systems were really helpful for me, i got supply only rates for insulation and render.

Posted By: eniacswork mates (from the EU) have all heard of it and many have had it done to their houses flats etc.

Can any of them source boards on the continent?

Posted By: eniacsMy research showed boards to be around £20/m2 for 100mm (im extrapolating out the cost from 80mm).
Fixings and beadings are pennys really not properly calculated but lets guess at £5/m2
Rendering team £5k ish so £33/m2 (only a guestimate, no quotes obtained yet)
Scaffolding £1k for 2 weeks £6.6/m2
So total cost: £64.60/m2

So how much more are the EWI installers quoting? Just interested????????????

Found these links which may be of interest -
http://www.inca-ltd.org.uk/index.asp
http://www.ea-etics.eu/

How many m2 of each thickness do you actually need?
I can direct you to a suppler that would do 125mm and 150mm PIR unfaced, those would give the same U values as the phenolic, and possibly in board sizes that you can specify. Not cheap but then again its good stuff

Is there any point in trying to maintain breathability for old buildings if you can use EPS and render instead which effectively provides a protective layer anyway? cheaper and more effective than wood wool, lime etc.?

And the second thing is i've never been able to find reliable fixings for 100m plus EPS sheet into stone. Seem to need at least 150mm fixings if they exist or do you all use two layers? (which sounds a good idea)

Posted By: sellyany point in trying to maintain breathability for old buildings if you can use EPS and render instead which effectively provides a protective layer anyway?

EPS-and-render EWI systems are water-vapour breatheable, as well as providing a liquid-water protective layer. But non-EPS plastic insulations are not breatheable.

Posted By: sellynever been able to find reliable fixings for 100m plus EPS sheet into stone

Much talk on here about ways and means of fixing, whether mechanical or just by adhesive.

It's all a big subject - you need to dive in and understand it.

Selly have a look at the wetherby website as suggested by RC28 above. Its very good, they have EWI down to an art by the looks of it. They have fixings for anything from 25mm to 400mm and fit any kind of insulant you want.

Much talk on here about ways and means of fixing, whether mechanical or just by adhesive.

It's all a big subject - you need to dive in and understand it.

whilst you could do belt or braces, I am inclined to do both

Hi eniacs, I did my bungalow with 100mm K5 fitted myself and rendered by a specialist company. I bought the boards from Seconds, because they were half price of Kingspan. I learned that you need exactly sized boards for EWI, because the render is only 8-10mm thick and wont cover greater differences. In my case the renderers added some more first coat plaster to level some of the surfaces - extra costs!
Anyway, Jewson told me that they would supply up to 100mm K5 and can order in greater thicknesses.

Posted By: SaintHow many m2 of each thickness do you actually need?
I can direct you to a supplier that would do 125mm and 150mm PIR unfaced i.e no foil, those thicknesses would give the same U values as the phenolic, and possibly in board sizes that you can specify. Not cheap but then again its good stuff

No interest?