External insulation - worth it?

Alkers86

Registered User
Messages
69
The effect
I've the same conundrum, was quoted 20k net of grant last year to do my (detached) house. My gas bills cost roughly 1000 per year so even if it saved me 33% as the installers usually claim, it'd take me 60 years to make that back. OK gas prices and carbon taxes will likely go up in the future but the ROI would still be extremely long. Hopefully they'll be better grants/incentives in the next few years to make this more viable.

If I needed to get the house re-plastered anyway though I think I'd probably go ahead and do it.
The cost of energy, particularly the burning of fossil fuels for home heating is likely to increase dramatically over the next 60 years.

Depending on the existing windows, I would actually wager you'd earn a payback quicker with the EWI.
 

JohnJay

Frequent Poster
Messages
895
The cost of energy, particularly the burning of fossil fuels for home heating is likely to increase dramatically over the next 60 years.
Very true. But chances are that technology and the quality/effectiveness of insulation will also improve. So the 100mm of insulation we use in 2020 might be obsolete by 2030.
Its not long ago that we thought 80mm of yellow fiberglass in our attic was the best thing since sliced pan!
 

shweeney

Frequent Poster
Messages
242
If your heating bills aren't that high, why are you even considering it?

Eliminating draughts might give you better bang for your buck.
 
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