Oz07

I don't think the chipboard will expand too much. Like when you leave 10mm expansion on things that you also have to nail. I'd be suprised if most chipboard would expand any more than 3 or 4 mm round the whole perimeter of a room

What about sole plate ontop of chipboard how much weight is in your partitions

Never seen it. Seems a bit rough

In reference to previous weeks post don't think ashp will graduate to mainstream until they are fit and forget. I wouldn't have the knowledge or understanding on how the fit an external pump or correct a software error. What chance does a non building person have?!

When I fill up to test i leave full till backfill if poss

Is there any difference in deflection or stiffness between posi and I joist

Claim undelivered should read

I used to be the type who would claim delivered but changed a year or two ago. Try to keep good karma now plus @Construction Channel has a point. I hate going anywhere to collect a parcel and it's only that way because society is knackered because we have no conscience

*toplite etc

Surely you can all figure out airated. Its the type that look like a aero chocolate bar with bubble like appearance. There are various manufactures which make them hence different product names celcon took its etc. Lightweight conc, sense conc then isn't there like a hybrid light conc with expanded clay @PeterW @Brickie @Declan52 ? I've used ultralytes on latest place

Leave them to do it in their own time. Surely you're not going to blow the dough each month because they aren't asking for it?!

Are we talking airated or lightweight conc?

I think op is specifically talking high performance frames where vapour barriers and condensation points etc etc

How long have you been following the forum? Did you get any prices for insulated raft?

Depending on what local authority I don't know of CIL will apply. I'm in Leicestershire and upto 2years ago we were still paying open space s106. My most recent planning had no CIL or 106. We must be a deprived county!

Yeh it won't be the norm as you say. But everyman and his dog are after a plot atm

I know a mate who bought in around 2011. Site had decent planning history. Bought for less than 10% gdv. Made a decent sum tax bill was 6 figures

* at this stage in the cycle. Time will come again when nobody has the appetite

Appreciated nod what are u paying for the membrane? I prices it up the osb is near on 3 quid a m2. By the time you buy membrane and tape was coming out more expensive and I think fiddly/harder to Do. Like I say not trying to achieve and super performance just enough to make the mvhr worthwhile

He's saying why use osb. I'm thinking if it's good enough for @joe90 it's good enough for me I'm not trying to beat the world

Do we think my 2x2 would better bedded on fm330? Supposed to be elastic just didn't know if it needed a certain thickness to work

Worked for @joe90 good enough for me

Cheers I'll copy you entirely then with the sealant choice!

I'm stealing @joe90 's method of making the roof airtight except doing it at ceiling level. Going to do whole ceiling with OSB then counter batten with some 2x2 for services All around perimeter where ceiling meets blockwork I will fix 2x2 with 10mm gap as OSB then fill with some foam i've already bought. Supposed to be airtight and elastic - https://www.illbruck.com/en_GB/product/fm330-pro-foam-air-seal/ On all the long joints of the boards i'll be gluing and screwing 2x2 through to the rafters. Short joints also laminated with offcut strips of the OSB. What is best to glue this? Obviously the timber and OSB aren't going to meet perfectly. I could use expanding D4 glue - but is this elastic? Will the seal eventually break? I could use some kind of silicone or sealant if better? What would be recommended? I did think about foam (i've heard people use it to stick skirting) but doesn't it need to have a minimum thickness to be elastic? Cheers

Is this emetti @Triassic? They seem to be the main one