Phil_space
Registered User
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I am planning a full renovation and small extension of a 1950s detached dormer and want to insulate the house beyond current building regs. Because of the age of the house there appears to be only a 2" cavity which was filled with polystyrene beads prior to my purchasing the house.
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Have spoken to Kingspan's recommended installers for the K5 based solution and been quoted two prices - 100 Euro per m2 and 120 Euro per m2. FranM who quoted you 80 Euro per m2?
... I'm unsure as to whether it's ok to post their contact info here
For what u-value of wall?
And to clarify, one of the Weber systems on the IAB cert IS the kingspan phenolic solution.
Its WAY more expensive than either of their other 2 options, which incidently are still too expensive.
For anyone looking at external insulation be aware that unless you have a very simple structure the system will have big thermal bridges which negate the benefit of the system. FOr example, the roof of a bay window will be flashed up against block wall. The insulation stops at the top of the flashing which leaves a 3 - 4 inch gap where you will have absolutely no insulation and it will be incredibly unsightly. Likewise where a sunroom meets a gable wall also has the exact same problem.
is a bridge too far.negate the benefit of the system
There is a need to distinguish between ugliness and Thermal Bridging.
I accept that the flashing associated with protrusions such as bay windows or extensions will make it a bit trickier but to say that they is a bridge too far.
A man walked on the moon in 1969, this is 2008 so it can be done.
Re doing a semi-D it can be done at the front, I have a picture of one done in Germany which I will post later
The IAB cert 06/0260 figure 11 clearly shows a significant cold bridge where there is no insulation at all where the flashing is done.
to clearly show a significant cold bridge
The pictures don't give any indication however as to how well it's actually performing.
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