EWI Advice/Ideas

[Charli]

Small 2-bed semi-detached, solid-wall house, uninsulated concrete floor. No heritage value, no features to keep at all. (the beautiful slate roof has already been replaced with a monstrosity). Very sheltered. No damp showing in house at the moment.

I can't live with having an uninsulated house. Its what I do- I insulate things!

 

I've only ever done IWI before, but this house is already tiny.

I was thinking:

• The block garage will be nominally 'done up' into a nice workshop, it won't be heated but indirect heat from adjacent room is about right. As the side of the garage is an earth bank I would IWI it- 100mm pir, and a new flat roof (100mm pir) with some kind of sunroof/roof lantern/lightwell. Includes blocking up the front garage door. Solid concrete floor, probably cover in rubber matting for workshop use.
• EWI on the gable end of the house- 150mm eps- down to the garage roof. I will extend the house roof to overhang the insulation.
• EWI on the back of the house to dpc level- will need to change the roof to overhang, change the guttering and work around windows (they'll need moving). Would like to go below dpc level, but seems pointless only on the back.
• The front of the house is awkward, there's electricity cables there, a porch, and EWI would make it be offset from the attached neighbours house. Is it worth sorting all of this, or shall I IWI that bit? 50mm pir would fit, with a turnback on the adjacent wall.
• The attached side of the house- downstairs is a gennel- so that’s exterior wall. Upstairs is party wall, so I can ignore that. The gennel is very narrow and I can't insulate externally. But internally its mostly a set of stairs, so not much room there either. I shall have to resort to aerogel IWI or something, working around the stairs. Better ideas welcome here.
• Loft will be drowning in insulation- 300mm (currently 150).

 

I will probably get a professional to model this for me (Recommendations for a thorough job in Derbyshire/Nottinghamshire?).

Or might even learn myself (would a retrofit assessor course be any use?). Its an area of interest, though it would never be a job for me. 

 

I would like to DIY a large amount of it (As I find it great fun, I am capable, and have family tradesmen that will help).

 

Ideas/experience/comments welcome!

 

 

[Mr Punter]

Bear in mind that lots of EWI has been a disaster recently.  Lots of mould, damp and ventilation issues, so this needs to be done meticulously, especially mixing EWI and IWI.