We present new 850 \mu m SCUBA-2 observations for a sample of 19 heavily reddened Type-I quasars at redshifts z \sim 2 with dust extinctions of A _ { V } \simeq 2 - 6 mag .
Three of the 19 quasars are detected at > 3 \sigma significance corresponding to an 850 \mu m flux-limit of \gtrsim 4.8 mJy .
Assuming the 850 \mu m flux is dominated by dust heating due to star formation , very high star formation rates ( SFR ) of \sim 2500-4500 M _ { \odot } yr ^ { -1 } in the quasar host galaxies are inferred .
Even when considering a large contribution to the 850 \mu m flux from dust heated by the quasar itself , significant SFRs of \sim 600-1500 M _ { \odot } yr ^ { -1 } are nevertheless inferred for two of the three detected quasars .
We stack the remaining 16 heavily reddened quasars and derive an average 3 \sigma upper limit on the SFRs in these quasar host galaxies of < 880 M _ { \odot } yr ^ { -1 } .
The number counts of sub-mm galaxies in the total survey area ( 134.3 arcmin ^ { 2 } ) are consistent with predictions from blank-field surveys .
There are , however , individual quasars where we find evidence for an excess of associated sub-mm galaxies .
For two quasars , higher spatial resolution and spectroscopic ALMA observations confirm the presence of an excess of sub-mm sources .
We compare the 850 \mu m detection rate of our quasars to both unobscured , ultraviolet luminous quasars as well as the much more obscured population of mid-infrared luminous Hot Dust Obscured Galaxies ( HotDOGs ) .
When matched by luminosity and redshift , we find no significant differences in the 850 \mu m flux densities of these various quasar populations given the current small sample sizes .