EquiumDuo

Thanks guys, I wont be attempting this completely blind, the old man's a builder so will mostly be following his lead. But I am keen to make sure we've got the best solutions for our budget, so all your feedback is appreciated. The other source fo rockwool in the cavity was rockwool's own datasheet. Also I assume Tony Tray is good? I can't tell haha!

Thanks for the input, I was looking at a very well insulated house. And following some guidance on youtube videos. Lots of the american guys in the northern regions use these rockwool bats on the outside of the tyvek housewrap. The rockwool is breathable so the idea being it is permeable to moisture but resists the temperature gradient and adds more sound insulation. Also puts a fire barrier between the outside and the inside fo the building. Which is a nice to have (not really needed for me though). Also according to this website https://www.changeplan.co.uk/u_value_calculator.php The difference between with and without the outer mineral wool is 0.19 (with) and 0.25 (without). Is that significant? Thank you for the blog link, currently getting throuigh ProDave's blog atm. I also do have and am chugging through the home builders bible, really good book but it is quite dry at times Any thoughts on how to route the mebranes around the joists?

Hi All, I've scoured lots of threads and I don't think I am doing anything extraordinary. But I have some questions. This is going to be the wall of a regular 4x bedroom house, rectangle shaped. Nothing too exciting. I've attached 2x photos, one is the wall make up: 12.5 mm Plasterboard Service Void 25/34mm (tbc) Vapour Control Layer (Dupont Airguard) 140mm Studs (filled with 140mm Rockwool Flexi) 19mm (tbc) OSB Permeable Membrane (Tyvek Housewrap) 50mm Cavity Partial Fill (Rockwool High Perf Cavity Fill) 50mm Airgap 100mm Dense Block External Render Nothing groundbreaking and mostly based on advice I've read here and the rockwool catalogue (plus some youtube videos). Please correct any mistakes, but this is what I'm looking at for the build. My main questions are: 1. A lot of suggestions for PIR boards (Celotex is mentioned often) to go in the cavity between the frame and the blockwork, but that doesnt make sense to me, PIR/foam boards seems air tight the way they should be layed out, whats the point opf a permeable membrane and rockwol etc to allow moisture out if you are going to put an insulated bin bag over the top? I'm literally imagining a wicking sports top, a hoodie and then a bin bag. You won't be very dry in that scenario. Is my analogy wrong or am I missing something? 2. With regards to the joists, I want to use engineered metal web joists (eg posi joist) between ground and first floor, how do these interact with the vapour control membrane and the permeable membrane? Looking at my second picture, is that how it all sits together? There would only be a small OSB/stud gap essentially between the end of the joist and the permeable mebrane, or is this just accepted as a comprimise? 3. For those of you choosing to go stick build yourself, how are you designing the walls/timber frame. Are you getting detailed plans from your architects? Are you buying a Haynes Manual or some other source? My google-fu is letting me down here. Thanks for your time.

I hope they are safe and well during the lockdown!

Hi, Been reading the forums for the alst few eeks as i get ready to start a self build with my wife. We are building a 2x bed with a full size basement on a slope. We are looking to go timber frame adn we are based in sout/west wales. We are looking to have planning, building regs,designs etc in place to allow us to start in Jan 2021.