tonyshouse

I think radon can go straight through polythene it is a very small and inert atom. Best ventilate under any membrane

I have always used PVA as a primer

Yes, on top are glazing bars with 3g units, toughened on top laminated under. Think ali soakers upside down and thin upstand over an end cap upside down in the end glazing channel, nothing at the top, possibly butyl foam to stop wind driven rain, ain’t leaked yet and 15+ yrs old and step on bottom of units 75mm

My guy used insulated plasterboard and gun fire foam i think

https://readinguk.org/draughtbusters/going-further/first-floor-void/

Here is one I did earlier, easier if glass goes into gutter but not essential https://www.dropbox.com/s/hgjq1apvpj0bgsh/IMG_0523.jpg?dl=0

Has it been designed to introduce shading in the summer? if it was mine and I wanted more light in just fit a piece of glass instead of tiles, glass tiles are sometimes available , don’t use lead near glass

My wife wanted me to repaint the render in our last house, I washed it and got away with that, the paint was top quality but had some streaking and a little bit of green algae.

Go for it, I have installed several bought off e-bay for charities no icing up problems but very low demand as well insulated

How important a factor are diminishing returns. These are often used as a reason for not adding sufficient insulation in my way of thinking a more important consideration is the alarming cost of retrofitting insulation. Factor that in and diminishing returns literally go out the window. further there is a step change once insulation levels get above the point where an expensive to install, run and maintain, heating system is no longer needed.

There are two types of hard water mostly calcium carbonate (chalk) is the white stuff heating pipes should not fur up as there is only one lot of water in the heating system and it is rarely changed. Tony’s tips for kettle -only boil the exact amount needed, fully empty and brush out the element after each use - no scale it forms as water cools down hot cylinder, keep on 24/7 at lowest possible temperature. Change fitting and pipe at the top every ten years, immersion every 5 hot water pipes will be ok , tap delivery gauzes and sinters/plastic bits and shower heads, soak in vinegar monthly should not be a problem for the ashp

They say 50mm of CWI and 300 loft insulation insufficient on both counts wall insulation is needed yes and should be done, I would say 200mm last lofts I did were 36 Almshouse flats £7k for top up to 300 but I asked for 400mm —. Same price!

Or has it cupped up, is it springy? Can you pull it back down with long screws? last resort is planer it

Yes, efflorescence, basically moisture moving out is carrying with it soluble nitrate salts, most likely sodium nitrate. It will brush off but is forcing off the paint heat will do this on its own even if water is not getting in through the top. cracking is unfortunately expected and will be due to thermal movements, building in lime with lime render would solve most of the problems.

Heat pumps loose efficiency (CoP) as delta T rises and low temperature rads work more economically insulate and if you deduce overall heat demand then existing rads will do the job of a low temp rad for heat pump lower the flow temperature the better and cheaper it will be to run

Or add insulation

I used that for soffits and cedar for fascias ten years ago, no paints oils or preservatives, all perfect http://tonyshouse.readinguk.org/external-woodwork-ten-years-on/

Within 5 or badly done 10mm

I have two loft traps forming an airlock, both draught sealed, bottom one is fairly normal drop down Wooden ladder At ceiling level. Upper one sits 600mm above and hinges up from the loft boarded floor 100mm pir on an OSB board

And on my own house like this, can you work out what I did? https://www.dropbox.com/s/fvpm7gh2tespz75/Porch .jpg?dl=0

Yes, but I would do the same even if not

I know but you can get wrinkles in it especially if it is in the sun, I often see cracks in 1.5m long stepped flashings

Not on the North side of a building, yes, over the limit for code 4 but no problem yet. I normally do 1.2m long = 1/5 th of roll cheated on this porch 1/2 3m roll top lap will be cut to the left a bit and plumb

One I did earlier https://www.dropbox.com/s/93ov68omfwzd00v/cover flashing.JPG?dl=0

Perimeter insulation Outside below ground but ideally up to ffl