willbish

Nada, will bung them an email tomorrow. Yep that's what I'm imagining. I would also think the top flange would need supporting to prevent any rotation The wall plate is lower. The rafter sits on the wall plate in a traditional way. The SE has said select joists from a standard span table. They are not part of the roof structure just ceiling joists. But the span is 6750 so solid timber isnt really an option. Most joists will have a stud wall or two to bear on but as these aren't structural I don't want to rely on them (might change layout one day). Also its only an attic with low loading. It doesn't need to be future proofed for a loft conversion; ridge height is too low, oh and the bats have priority! Just exploring options really and thought Id see if JJI was a possibility

Is there a standard method of fixing/hanging JJI joists to solid timber rafters?

Yes, high radon area and full protection measures required. I agree the effectiveness of the sump is questionable in that location. I didn't want to cut a hole and a channel into my insulation to accommodate just below the slab, so I proposed placing it in the Type1 to Building Control who were happy. Exactly ?

I've left a 75mm perimeter gap between inside skin of ICF walls and first UFH pipes. I'm going to fix scaff boards down at one end for the props to sit on. Like Russ says many many different ways to do it. The added faff of messing about with scaff boards out weighs cost of UFH in separate screed in my case.

Page 8 of the AFT catalogue has some section drawings which may be of use to you Particularly if you want to build a solid outside skin AFT(29515)Groundshield_Installation_V2.pdf

Its quite difficult to make out your scan. Here's a drawing I did of my passive slab. The hardcore layer needs to extent beyond the edge of the insulation which isnt shown. Part of the reason I chose Isoquick was because the concrete has 300mm under all areas. Some other systems have less insulation around the ring beam. Foundation Section.pdf

The sunamp home page says they are stackable? I hope this is not another marketing diversion like the advertised A+ ErP rating but in reality comes with a C sticker. (That has annoyed me because I can't see how it is anything other than false advertising and purposely misleading) I was planning to stack my units...

Thanks @A_L Would help if I spell it correctly, permeance

Thanks @Ed Davies, Looks like green slime heading my way! ? I hadn't acknowledged the differing units of vapour permanence /permeability/ resistance/ resistivity, I'm not pretending I understand these differences yet. For me the Ubakus model is difficult to use because I want to experiment with different roofing membranes; my ecologist has specified a traditional bitumen felt membrane for the bat roost however this conflicts with using full fill insulation in the rafters. My current thinking/aspiration is to use a vapour permeable membrane for the eaves sections along with full fill insulation, then where the loft space starts transition to bitumen to keep the batman happy. There will be no insulation in the loft space rafters. If anyone has any other bright ideas /suggestions that would be great.

Any recommendations for a good online condensation analysis? Ive been playing around with this one https://www.ubakus.de/u-wert-rechner/? Its spot on but a lot of the materials are German and its proving difficult matching them to equivalents.

Hope you weren't expecting that mince pie to warm up?!

The bottoms of steel and joists are to be level 202mm joists high 162mm steel

Anybody have an opinion on this method fixing posi-joists to steel? I thought I would have to use a packer in the flange of the steel but seems not.

Yes that is right. Whether or not it was correctly zero rated is debatable! @Adam2 I can give you the name of the company that conducted my investigation. I think your location is within his area.

That's great to hear. You don't get that with a combi boiler during a power outage

Will there be any effect if you draw hot water during that power off minute? Just a glug of cold or preheat water through your hot pipes?

That's disappointing to hear @PeterW Is there a way to limit the expansion by fixing a temporary board over the void while it expands? I imagine trimming any excess back is probably equally a crap job as cutting PIR boards to fit.

@A_L yep that is eye-wateringly expensive. The advantages are potentially a lot less wastage than PIR boards and can form an airtight barrier so some cost savings if the alternative is a membrane. Any other advantages/disadvantages?

Is this a closed cell DIY kit? Claims >90% closed cell content in the tech spec.

My UniQ eHW9 & eDuel12 is sat on a pallet in Sunamp HQ awaiting dispatch when my build is ready. I read all the Sunamp bumf prior to purchasing the UniQ but also based my choice on the balanced opinions of those on this forum who own/ed the Sunamp PV. To think the UniQ is unable to deliver the same fundamental feature of the previous model is unacceptable. I will be watching closely how Sunamp respond but am hopeful they will be able to deliver an adequate solution. Although I'm slightly skeptical as a hardware alteration as well software will be a significant upgrade. I don't think it's unreasonable to assume that the UniQ would behave with similar characteristics to the SAPV, therefore, like @JSHarris should be entitled to a refund if we so desire

I've just stumbled across this product; saw a passive house in Vancouver where they brought the air tightness score down from 0.83ACH to 0.16 in 90 minutes. As @MikeSharp01 suggests, I wonder what effect the sealant has when it lands all over the window and door seals because it must travel to all leaking areas indiscriminately. If anything it could be a fall back product if the airtightness level is greater than anticipated/hoped

I was recently supplied incorrect grade of steel reinforcement mesh for my slab. It was discovered by BCO during pre concrete inspection, after discussion with the SE the only sensible solution was to take it up (two layers with UFH pipes tied to the top) and replace with correct grade. After much back and forth with the supplier and some excellent advice from Citizens Advice, the correct mesh was delivered free of charge and £1k of credit put on my account for the consequential losses I suffered.

For every day this continues you are incurring consequential losses as a result of their error. I would say to the supplier that you are willing absorb the losses of the first 3 days but after that they are liable. You have (hypothetically) labour on site unable to progress who still need paying.

I would say no. I was told the existing dwelling on my plot could not offset the floor area of the new build because it had been vacant for many years. I don't know the specifics of cill but I would guess unless your buildings have been habited they would not be eligible.

Hi @evelar Welcome to the forum. Great looking project. I'd be really keen to see how you've incorporated timber into your build. Have you got oak internally and externally? I'm planning to stick an oak facade on my ICF porch