Papercrete is a recent technology we have limited information about the technology and the structural properties. A compressive strength of 5.5 MPa with sand in the mix has been reported, which falls to 0.96 – 1.7 MPa without the sand. Due to the large air content it fails slowly in compression, rather than in a brittle manner.Tensile strenght is really poor.
Papercrete has very good insulating properties. Paper fibres trap the air , and when the water drains out, leaves tiny air pockets which result in an R-value equal to 2-3 R/inch. (more than insulating materials).
In order to be resistant to water, moisture and fire, chemical adhesives are added in the mix. Papercrete is also susceptible to termite and mold.