The simpler the better!

[WelshMatt]

6 hours ago, Iceverge said:

I would be cautious of natural (hole in the wall) ventilation. It tends to be very drafty in windy weather and under ventilate the rest of the time with the associated buildup of pathogens, VOC's, mould, etc. It's the equivalent of having a hole in the roof for drinking water.

 

Am I correct in assuming your current lodging doesn't have a mechanical ventilation system of some sort?

 

I've been put of PIV and vents now for sure by all the comments here so it was worth my post just to have some clarity 😀

 

My current home is just a bog standard semi detached with a gas boiler and manual windows for ventilation so this would be a massive change for me.

[Simplysimon]

7 hours ago, WelshMatt said:

What are the best ones that have no risk of 'sagging' over the years?

I guess sips aren't the best but there has to be a compromise along the way in terms of costs and build time. Unfortunately I won't have a massive budget and I'm not that good with my hands to take on a lot of the work myself.

a few of us have gone down the route of blown cellulose, as it's blown under pressure it ends up quite a firm, semi dense insulation which won't sag, also no chemicals, well other than boron.

[SteamyTea]

38 minutes ago, Simplysimon said:

also no chemicals

And carbon, hydrogen, oxygen, probably iron, titanium dioxide, cobalt, copper in trace quantities in the ink.

 

Everything we can see and touch is chemicals.