Cell Foam Insulation Pour Place Spray System
If you want better insulation, you’ll need to install a thermal break, like interior rigid foam board. I have some concerns / queries about the connections: 1.
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Cfb (temperate, without a dry season and with warm summers). We will also upgrade our windows to some form of double glazing, and will need to replace the roof and insulate it at the same time.
Can anyone provide advice or guidance for this plan?
Similar situation with the cavity to ceiling insulation / airtight layer connection. But, if the basement is going to be finished conditioned space, then it may be easier to waterproof the block on the outside and insulate, strap and finish on the inside.
Detailed energy saving performance analyses on thermal mass walls demonstrated in a zero energy house. These products alone do not serve as air, water, and vapor control layers; thus they require additional materials or systems be implemented into the system.
These products provide an air and vapor control layers at the interior face of the product, which is fully taped and/or sealed at seams, edges, and penetrations and to perimeter elements such as floor slabs and roof structures.
When thermally optimizing this wall system, it is more effective to provide unbridged continuous insulation or continuous insulation in addition to cavity insulation. I wouldn’t advise messing with the structural connection between the wythes without very specific engineering advice. Modernism failure #1 – believing the world never changes and you’ll never need a construction cavity to run service updates. I see what you mean about the magnitude of the thermal bridge between cavity and window. This thermal bridge may fall on to the wrong side of the cost-benefit ratio. If there already is a vapour barrier breaking the internal wall at this point, that would be good enough for me, as you suggest.
The energy production side of the two sided energy requirement/production coin is by far and away the optimistic side of my predicament. In your climate you really don’t need a vapor barrier (ever), but you do need a capillary break between the interior leaf and exterior leaf to keep the interior paint or other finishes from failing or growing mold due water wicking in from from the exterior after rain/dew events.
The cavity in a cavity wall provides that capillary break, but closed cell foam will do almost as well as a capillary break. Some non-expanding injection foams would not be nearly as good, nor would open cell foam. My next sentence (acknowledging that you live in a mild climate) explained why my emotional impulse was irrelevant. James, this is great information for me. Again, many thanks for this information and new line of enquiry for me.
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