Use beam and block insulation for EWI install?

[oranjeboom]

So, there's a building site up the road from me where they 70+ house are having beam and block floors installed and using EPS as filler between the beams and again on top before a cement screed goes over. So there are mountains of the EPS offcuts that have all been bagged up awaiting for collection (Landfill, 'recycling'?). As this is high density EPS I was pondering whether it would be a suitable option for me to utilise these offcuts for my EWI project? The offcuts appear to be pretty large (at least 500-700mm in size and possibly 200mm thickness. It may take me a bit longer in terms of trimming them square and I will end up using more mechanical fixtures but seems to be a green alternative for me to save them going to landfill or 'recycling'....

 

Is this a bad idea? I'll end up with more joins so will that increase the chances of cracking over time? I'll be using mesh and some poly render.

[JohnMo]

Sounds like a plan. Mist spray joints and use expanding foam. Allow to gel and push together this should give bridge free joint. Forming a single wall of EPS. You could use a similar method to stick to substrate plus mechanical fixings.